Setting array size, effect on memory

Does setiing the array size to a huge no has any affect on the memory, performance and is it considered good programming. If not what are the other options?
String [] arrayString = new String [2354];

Your question is rather ambiguously worded.
In Java arrays cannot be resized, so you should set the array to the exact size you need. If you need a huge array, create one. If you need a small array, create one. If you don't know how large it should be, or need it to be dynamically sized, use any of these great classes - ArrayList, HashMap, HashSet, etc... Try reading the Java API documentation on these classes...
And yes, when you create a huge array, it actually allocates the space for each element in the array right then, and in fact initializes each with the default values of null, zero, or false depending on the type of the array.

Similar Messages

Mapping set heap sizes to used memory

Hi all,
I've got a question about the parameters used to control your java process' heap sizes: "-Xms128m -Xmx256m" etc.
Let's say I set my min and max to 2Gb, just for a simplistic example.
If I then look at the linux server my process is running on, I may see a top screen like so:
PID USER      PR NI VIRT RES SHR S %CPU %MEM    TIME+ COMMAND
10647 javaprog 20   0 2180m 1.9g 18m S 1.3 3.7   1:57.02 javaWhat I'm trying to understand is what relationship - if any - there is between these arguments and the figures I see within top. One thing in particular that I'm interested in is the fact that I occasionally see a RES (or more commonly a VIRT) size higher than the maximum that I have provided to Java. Naively I would assume that therefore there isn't a relationship between the two... but I wouldn't mind someone clarifiying this for me.
Any resources on the matter would be appreciated, and I apologise if this question is outside the realms of this particular subforum.
Dave.

Peter Lawrey wrote:
user5287726 wrote:
Peter Lawrey wrote:
It will always reserve this much virtual memory, plus. In term of resident memory, even the minimum is not guarenteed to be used. The minimum specifies at what point it will make little effort to recycle memory. i.e. it grows to the minimum size freely, but a "Hello World" program still won't use the minimum size.No, Linux does not reserve virtual memory. Just Google "Linux memory overcommit". Out-of-the-box, every Linux distro I'm aware of will just keep returning virtual memory to processes until things fall apart and the kernel starts killing processes that are using lots of memory - like your database server, web server, or application-critical JVMs. You know - the very processes you built and deployed the machine to run. Just Google "Linux OOM killer".Thats not the behaviour I see. When I start a process which busy waits, but doesn't create any objects, the virtual memory sized used is based on the -mx option, not how much is used. Given virtual memeory is largely free, why would an OS only give virtual memory on an as needs basis.
Busy looping process which does nothing.
In each case the resident size is 16m
option       virtual size
-mx100m      368m = 100m + 268m
-mx250m      517m = 250m + 267m
-mx500m      769m = 500m + 269m
-mx1g        1294m = 1024m + 270m
-mx2g        2321m = 2048m + 273mTo me it appears that the maximum size you ask is immediately added to the virtual memory size, even if its not used (plus an overhead) i.e. the resident size is only 16m.Yes, it's only using 16m. And its virtual size may very well be what you see. But that doesn't mean the OS actually has enough RAM + swap the hold what it tells all running processes they can have.
How much RAM + swap does your machine have? Say it's 4 GB. You can probably run 10 or 20 JVMs simultaneously with the "-mx2g" option. Imagine what happens, though, if they actually try and use that memory - that the OS said they could have, but which doesn't all exist.
What happens?
The OOM killer fires up and starts killing processes. Which ones? Gee, it's a "standard election procedure". Which on a server that's actually doing something tend to be the processes actually doing something, like your DBMS or web server or JVM. Or maybe it's your backups that get whacked because they're "newly started" and got promised access to memory that doesn't exist.
Memory overcommit on a server with availability and reliability requirements more stringent than risible is indefensible.

Set Fixed Array Size

Hello. I am trying to develop a VI for an FPGA target and I'm trying to make it so whoever is using the VI can specify the size of an input array when they instantiate it (such as by having an input to the VI that says "max array size" or something). So far it seems like the only way to do something like this is to go into the VI itself and manually set the array size for each input array for the VI (i.e. open the VI, right click on each input array, select "Set Dimension SIze", choose "fixed", set number of elements). I'd like to have one point where I can set the size of all the arrays at once (since in my case they are all the same size), and let the person using the VI set it to the proper size for whatever application they are using it for (to be clear, let's say I have two uses for this VI, and in one case I have an input array of size 100 and in anohter use of size 1000, I'd like to be able to set these somehow instead of doing it through the dialog). Thanks.
Solved!
Go to Solution.

Unfortunately, per-call configuration of array size is not something that is supported today. This is a great idea, I would suggest that you post it on the FPGA Idea Exchange so we can get a feel for how many other people need this same feature.

Does Reinit To Default set an Array size to zero?

Does the function Reinit To Default set a 2D Array size to zero? The Help is not explicit on this.
If not, what is the best way to set a 2D Array size to zero?
Solved!
Go to Solution.

Yes, it sets the size of an array to zero elements, unless the default value is defined otherwise (right click, make current value default.).
There are several ways to empty an array indicator/control.Normally I write it's value to the terminal or to a local variable. I have never used 'Reinit values to default'
Ton
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How to set the array size

Hi,
below is my sample code
class test
int sample[][]=new int[10][10];
int rows=0,k=0;
int columns=0;
public void meth()
rows=9;
columns=9;
}//end of meth()
public meth_2()
for (int i=0;i<rows;i++)
for(int j=0;j<columns;j++)
sample[i][j]=k;
k++;
for (int i=0;i<rows;i++)
for(int j=0;j<columns;j++)
System.out.println(sample[i][j]);
}//end of meth_2()
public int[][] getList()
return sample;
}//end of classNow that my question is, i need to set the size of array sample[][] to sample[rows+1][columns+1].. but to do so, 'rows' and 'columns' values will only be generated upon the execution of method meth() . I need sample[][] array to be declared right after the class begins. The values that are returned from sample[][] array through that getList() method is been used in another class.. So how do i set the size of sample[][] array to
int sample[][] = new int[rows+1][columns+1];Any response is highly appreciable.
Thanks in advance
Edited by: netbeans2eclipse on Sep 14, 2008 1:20 PM

It seems you answered your question yourself ;-)
Just split this:
int sample[][] = new int[rows+1][columns+1];in two parts.
Declaration:
int sample[][];and instantiation in meth() or meth_2():
sample = new int[rows+1][columns+1];

Motion Assistant Contour Array Points - Optimal Array Size?

I am working with the NI Motion Assistant API and plyaing around with the Contour Move generation where I feed a set of X, Y target points to the Set Contour Move Properties.
One of the inputs is Profile Calculation Constraint - Array Size, Constraint Value (which would be the array size to use).
I am wondering if there is a way to calculate the "optimal" array size for any particular move? I know I can have too few - can I have too many points in an array (being reasonable here and not planning to use the whole 2^32 size allowed).
Thanks.
Ryan Vallieu
Automation System Architect

Hi Ryan,
Unfortunately, I'm not so sure I have a good answer for you. I'll evaluate some of the pros and cons below and then ultimately make a recommendation:
Constraint Type: Array Size
Pros
You always have a fixed sized array of setpoints. If you are using a 73xx card, this simplifies setting up your contour buffer. It also avoids using a lot of memory.
Cons
For long moves, you could have a long time and large distance between position setpoints. The motion card will do a spline interpolation to smooth the move, but the splining algorithm is only so good.
If you are sending the contour setpoints to a motion card, you don't know the interval between setpoints (although this isn't difficult to obtain).
Constraint Type: Sampling Time
Pros
Regardless of the move, you always have a fixed time between setpoints. As long as your sampling time isn't too large, even fast moves should execute accurately.
Cons
For a long move, you could generate a lot of setpoints that consume a lot of memory.
Setting up contouring buffers can be trickier.
Conclusion
It depends on what you expect the end customer to be doing. I prefer using the sampling time constraint since it is more robust for fast, long moves (and still good for slow, short moves). It will make creating contour buffers more difficult, but there is an example (Two-Axis Smart Contouring.vi) that shows how to dynamically update the buffer. Ultimately, I think it is better to focus on accurate moves than minimizing memory consumption.
If you decide to go with the sampling time method, I would start with a constraint value of .01, since 10msec is the shortest interval when configuring a contour buffer. Try and generate some position profiles to see how big the arrays are. For optimizing, it is just a tradeoff between array size and the accuracy of the generated motion profile.
Thanks,
Paul B.
Motion Control R&D

Change array size and delete duplicate row

Hello,
I am running a program that does a for loop 3 times. In each loop, data is collected for x and y points (10 in the example provided). How can I output the array with the 30 points in a simple 2D array (size 2x30)?
Also, from the array, how do I delete duplicate rows that contain the same x-value?
Thanks,
hiNi.
Solved!
Go to Solution.
Attachments:
array size.vi ‏10 KB

Hello,
THANK YOU for solving my first issue! Attached is the data set that contains the duplicate entries for the x-axis values. The y-axis value may be different, but not the x. I would like to delete the 2nd row that contains the same x-value.
Here is simple example of my input and desired output:
IN:
28.512000 -115.310532
28.812000 -86.937660
29.112000 -116.877052
29.412000 -87.223625
29.412000 -111.349045
30.012000 -86.510780
30.312000 -112.048187
OUT:
28.512000 -115.310532
28.812000 -86.937660
29.112000 -116.877052
29.412000 -87.223625
30.012000 -86.510780
30.312000 -112.048187
I am thinking of comparig the last x-axis value to the current one, and if it is the same, then not parse that row. The attached VI is as far as I got.
Any help will be greatly appreciated.
Thanks,
hiNi
Attachments:
delete duplicate row.vi ‏8 KB
data.txt ‏1 KB

Problem Array size in Windows 7

Hello All,
I have a VI that by opening in a new Laptop, it show some Arrays controls misfits (with a diferent array size), however i can´t put it right.
But when i make a EXE of this VI and if i run the EXE in another Computer, the front panel appears aligned and Ok.
I´m using the labview 2009 Sp1 with Windows 7, this vi have been created in another laptop in a older version and always with the Windows Xp, and whenever i was updated the version of labview it always appeared correct on those Laptop, until now when i changed the laptop and the Operating System to Win7.
Any help/advice is much apreciated
Thanks,
Solved!
Go to Solution.

Make sure you use the same font settings for all the controls that you want to be aligned. You might have some controls set to a specific font name and others left to the default Application font. LabVIEW substitutes the Application font for whatever the system default font is on a particular computer.
Different fonts are default and available on different Windows versions so you can certainly get into trouble here if you mix font families and names in the same UI.
If you request a specific font name and it is not available on a certain machine Windows will substitute it with a different font that it thinks looks similar but the heuristics of that substitution can sometimes go really way south of the equator and simply give crazy results.
Rolf Kalbermatter
CIT Engineering Netherlands
a division of Test & Measurement Solutions

How to adjust a "control array" size

I have a program that creates a digital PWM signal with variable duty cycle. The duty cycle changes every 50 ms, but the overall wave frequency stays at a frequency determined by the user. I have the VI attatched.
My problem is this...I need to be able to control the overall cycle time. This means the size of my array of duty cycles needs to adjust based on the cycle time (i.e. a cycle time of 1 second would require 20 of the 50 ms slots, while a 1.3 second cycle would need 26).
I currently have only 4 slots in my array, meaning the total cycle time is .2 s. I understand how to manually add and remove elements to the array, but I can't figure out how to add a control to it so that the array size changes automatically, allowing much quicker entry of data. As of now I can make it work, it just takes super long to add or delete array elements. The ideal situaton would have a constant control for cycle time divided by 50 that would change the array size.
I can't find any info on this, and I think I even saw a post asking that this kind of feature be added. I'm relatively new to this program.
Thanks
Solved!
Go to Solution.
Attachments:
var_duty_cycle.vi ‏25 KB

Currently, your VI is a one-shot deal. What you need is a state machine that updates the pct duty cycle array control as a function of the frequency while the current I/O code is idle.
I would use an array of clusters, where each cluster contains e.g. a sequence number, a duty cycle, and a string as element label. Show the scrollbar and set the size whenever the relevant inputs change. Do you want to reset the current setting when the number changes or do you want to retain the current settings as much as possible? You could just use the existing values, reshape to the larger or smaller size, and write it back to the control via a local variable. Set all elements except the percent to disabled so they act as indicators and cannot be changed by the user.
(You also need to program around it if the operator tries to manually add more elements. A better solution would be this idea, so vote for it .)
Some more general comments bout your code:
Why do you use extended precision floating point. All your waits are internally just integers. EXT makes no sense
There is a primitive for 1/x. However, you could just do a 1000/x and eliminate the multiplication afterwards. SInce you are dealing with integers, you can even do the division using quotient&remainder. Depending on the allowed frequency range there are possibly no orange data needed at all.
Make the diagram constant representation match the rest of the code.
The pulses/50ms indicator belongs before the loop. No need to recalculate and refresh it over and over from the same input values.
LabVIEW Champion . Do more with less code and in less time .

Switching to Mac, how to set up After Effects

I just received my new Mac Pro and subscribed to Adobe Cloud.
I'm setting up After Effects and need to set my Media Cache for fast processing. I am reading that I should set it to write to a separate hard drive from what I am saving my project to, but I don't know how to navigate to the folder that would write these files. Where is this located on the system?
Processor 3.33 GHz 6 Core Intel Xeon
Memory 32 GB 1333MHz DDR3 ECC
Graphics ATI Radeon HD 5870 1024 MB
OS X 10.8.2

Open up you preferences file by clicking on After Effecs in the menu bar and then picking preferences.

How to increase Array size while copying from remote table

Hi everyone,
I am using remote copy to copy 900,000(9 millions) records to local data base ,but it is taking long time obviuosly. The message i see while copying is
Array fetch/bind size is 15 (array size is 15)
can Array size be changed to make copy faster or
any otherway to copy 9 million reocrds fastly?
regards,
Karna

I guess that you are using the 'copy' command in sql*plus.
1. You could export the remote table and import the data into your local table. That perhaps would be efficient.
2. You could increase the array size for example,
SQL> show arraysize
arraysize 15
SQL> set arraysize 5000
SQL> show arraysize
arraysize 5000
SQL> What is the value for sql*plus option 'copycommit'?
SQL> show copycommit
copycommit 0
SQL>

Java.lang.OutOfMemoryError: Requested array size exceeds VM limit

Hi!
I've a this problem and I do not know how to reselve it:
I' ve an oracle 11gr2 database in which I installed the Italian network
when I try to execute a Shortest Path algorithm or a shortestPathAStar algorithm in a java program I got this error.
[ConfigManager::loadConfig, INFO] Load config from specified inputstream.
[oracle.spatial.network.NetworkMetadataImpl, DEBUG] History metadata not found for ROUTING.ITALIA_SPAZIO
[LODNetworkAdaptorSDO::readMaximumLinkLevel, DEBUG] Query String: SELECT MAX(LINK_LEVEL) FROM ROUTING.ITALIA_SPAZIO_LINK$ WHERE LINK_LEVEL > -1
*****Begin: Shortest Path with Multiple Link Levels
*****Shortest Path Using Dijkstra
[oracle.spatial.network.lod.LabelSettingAlgorithm, DEBUG] User data categories:
[LODNetworkAdaptorSDO::isNetworkPartitioned, DEBUG] Query String: SELECT p.PARTITION_ID FROM ROUTING.ITA_SPAZIO_P_TABLE p WHERE p.LINK_LEVEL = ? AND ROWNUM = 1 [1]
[QueryUtility::prepareIDListStatement, DEBUG] Query String: SELECT NODE_ID, PARTITION_ID FROM ROUTING.ITA_SPAZIO_P_TABLE p WHERE p.NODE_ID IN ( SELECT column_value FROM table(:varray) ) AND LINK_LEVEL = ?
[oracle.spatial.network.lod.util.QueryUtility, FINEST] ID Array: [2195814]
[LODNetworkAdaptorSDO::readNodePartitionIds, DEBUG] Query linkLevel = 1
[NetworkIOImpl::readLogicalPartition, DEBUG] Read partition from blob table: partition 1181, level 1
[LODNetworkAdaptorSDO::readPartitionBlobEntry, DEBUG] Query String: SELECT BLOB, NUM_INODES, NUM_ENODES, NUM_ILINKS, NUM_ELINKS, NUM_INLINKS, NUM_OUTLINKS, USER_DATA_INCLUDED FROM ROUTING.ITA_SPAZIO_P_BLOBS_TABLE WHERE PARTITION_ID = ? AND LINK_LEVEL = ? [1181,1]
[oracle.spatial.network.lod.LabelSettingAlgorithm, WARN] Requested array size exceeds VM limit
[NetworkIOImpl::readLogicalPartition, DEBUG] Read partition from blob table: partition 1181, level 1
[LODNetworkAdaptorSDO::readPartitionBlobEntry, DEBUG] Query String: SELECT BLOB, NUM_INODES, NUM_ENODES, NUM_ILINKS, NUM_ELINKS, NUM_INLINKS, NUM_OUTLINKS, USER_DATA_INCLUDED FROM ROUTING.ITA_SPAZIO_P_BLOBS_TABLE WHERE PARTITION_ID = ? AND LINK_LEVEL = ? [1181,1]
Exception in thread "main" java.lang.OutOfMemoryError: Requested array size exceeds VM limit
I use the sdoapi.jar, sdomn.jar and sdoutl.jar stored in the jlib directory of the oracle installation path.
When I performe this query : SELECT BLOB, NUM_INODES, NUM_ENODES, NUM_ILINKS, NUM_ELINKS, NUM_INLINKS, NUM_OUTLINKS, USER_DATA_INCLUDED FROM ROUTING.ITA_SPAZIO_P_BLOBS_TABLE WHERE PARTITION_ID = ? AND LINK_LEVEL = ? [1181,1]
I got the following result
BLOB NUM_INODES NUM_ENODES NUM_ILINKS NUM_ELINKS NUM_INLINKS NUM_OUTLINKS USER_DATA_INCLUDED
(BLOB) 3408 116 3733 136 130 128 N
then the java code I use is :
package it.sistematica.oracle.spatial;
import it.sistematica.oracle.network.data.Constant;
import java.io.InputStream;
import java.sql.Connection;
import oracle.spatial.network.lod.DynamicLinkLevelSelector;
import oracle.spatial.network.lod.GeodeticCostFunction;
import oracle.spatial.network.lod.HeuristicCostFunction;
import oracle.spatial.network.lod.LODNetworkManager;
import oracle.spatial.network.lod.LinkLevelSelector;
import oracle.spatial.network.lod.LogicalSubPath;
import oracle.spatial.network.lod.NetworkAnalyst;
import oracle.spatial.network.lod.NetworkIO;
import oracle.spatial.network.lod.PointOnNet;
import oracle.spatial.network.lod.config.LODConfig;
import oracle.spatial.network.lod.util.PrintUtility;
import oracle.spatial.util.Logger;
public class SpWithMultiLinkLevel
     private static NetworkAnalyst analyst;
     private static NetworkIO networkIO;
     private static void setLogLevel(String logLevel)
     if("FATAL".equalsIgnoreCase(logLevel))
     Logger.setGlobalLevel(Logger.LEVEL_FATAL);
     else if("ERROR".equalsIgnoreCase(logLevel))
     Logger.setGlobalLevel(Logger.LEVEL_ERROR);
     else if("WARN".equalsIgnoreCase(logLevel))
     Logger.setGlobalLevel(Logger.LEVEL_WARN);
     else if("INFO".equalsIgnoreCase(logLevel))
     Logger.setGlobalLevel(Logger.LEVEL_INFO);
     else if("DEBUG".equalsIgnoreCase(logLevel))
     Logger.setGlobalLevel(Logger.LEVEL_DEBUG);
     else if("FINEST".equalsIgnoreCase(logLevel))
     Logger.setGlobalLevel(Logger.LEVEL_FINEST);
     else //default: set to ERROR
     Logger.setGlobalLevel(Logger.LEVEL_ERROR);
     public static void main(String[] args) throws Exception
          String configXmlFile =                "LODConfigs.xml";
          String logLevel =           "FINEST";
          String dbUrl =                Constant.PARAM_DB_URL;
          String dbUser =                Constant.PARAM_DB_USER;
          String dbPassword =                Constant.PARAM_DB_PASS;
          String networkName =                Constant.PARAM_NETWORK_NAME;
          long startNodeId = 2195814;
          long endNodeId = 3415235;
     int linkLevel = 1;
     double costThreshold = 1550;
     int numHighLevelNeighbors = 8;
     double costMultiplier = 1.5;
     Connection conn = null;
     //get input parameters
     for(int i=0; i<args.length; i++)
     if(args.equalsIgnoreCase("-dbUrl"))
     dbUrl = args[i+1];
     else if(args[i].equalsIgnoreCase("-dbUser"))
     dbUser = args[i+1];
     else if(args[i].equalsIgnoreCase("-dbPassword"))
     dbPassword = args[i+1];
     else if(args[i].equalsIgnoreCase("-networkName") && args[i+1]!=null)
     networkName = args[i+1].toUpperCase();
     else if(args[i].equalsIgnoreCase("-linkLevel"))
     linkLevel = Integer.parseInt(args[i+1]);
     else if(args[i].equalsIgnoreCase("-configXmlFile"))
     configXmlFile = args[i+1];
     else if(args[i].equalsIgnoreCase("-logLevel"))
     logLevel = args[i+1];
     // opening connection
     System.out.println("Connecting to ......... " + Constant.PARAM_DB_URL);
     conn = LODNetworkManager.getConnection(dbUrl, dbUser, dbPassword);
     System.out.println("Network analysis for "+networkName);
     setLogLevel(logLevel);
     //load user specified LOD configuration (optional),
     //otherwise default configuration will be used
     InputStream config = (new Network()).readConfig(configXmlFile);
     LODNetworkManager.getConfigManager().loadConfig(config);
     LODConfig c = LODNetworkManager.getConfigManager().getConfig(networkName);
     //get network input/output object
     networkIO = LODNetworkManager.getCachedNetworkIO(
     conn, networkName, networkName, null);
     //get network analyst
     analyst = LODNetworkManager.getNetworkAnalyst(networkIO);
     double[] costThresholds = {costThreshold};
     LogicalSubPath subPath = null;
     try
          System.out.println("*****Begin: Shortest Path with Multiple Link Levels");
          System.out.println("*****Shortest Path Using Dijkstra");
          String algorithm = "DIJKSTRA";
          linkLevel = 1;
          costThreshold = 5000;
          subPath = analyst.shortestPathDijkstra(new PointOnNet(startNodeId), new PointOnNet(endNodeId),linkLevel, null);
          PrintUtility.print(System.out, subPath, true, 10000, 0);
          System.out.println("*****End: Shortest path using Dijkstra");
          catch (Exception e)
          e.printStackTrace();
          try
          System.out.println("*****Shortest Path using Astar");
          HeuristicCostFunction costFunction = new GeodeticCostFunction(0,-1, 0, -2);
          LinkLevelSelector lls = new DynamicLinkLevelSelector(analyst, linkLevel, costFunction, costThresholds, numHighLevelNeighbors, costMultiplier, null);
          subPath = analyst.shortestPathAStar(
          new PointOnNet(startNodeId), new PointOnNet(endNodeId), null, costFunction, lls);
          PrintUtility.print(System.out, subPath, true, 10000, 0);
          System.out.println("*****End: Shortest Path Using Astar");
          System.out.println("*****End: Shortest Path with Multiple Link Levels");
          catch (Exception e)
          e.printStackTrace();
     if(conn!=null)
     try{conn.close();} catch(Exception ignore){}
At first I create a two link level network with this command
exec sdo_net.spatial_partition('ITALIA_SPAZIO', 'ITA_SPAZIO_P_TABLE', 5000, 'LOAD_DIR', 'sdlod_part.log', 'w', 1);
exec sdo_net.spatial_partition('ITALIA_SPAZIO', 'ITA_SPAZIO_P_TABLE', 60000, 'LOAD_DIR', 'sdlod_part.log', 'w', 2);
exec sdo_net.generate_partition_blobs('ITALIA_SPAZIO', 1, 'ITA_SPAZIO_P_BLOBS_TABLE', true, true, 'LOAD_DIR', 'sdlod_part_blob.log', 'w', false, true);
exec sdo_net.generate_partition_blobs('ITALIA_SPAZIO', 2, 'ITA_SPAZIO_P_BLOBS_TABLE', true, true, 'LOAD_DIR', 'sdlod_part_blob.log', 'w', false, true);
Then I try with a single level network but I got the same error.
Please can samebody help me?

I find the solution to this problem.
In the LODConfig.xml file I have:
<readPartitionFromBlob>true</readPartitionFromBlob>
               <partitionBlobTranslator>oracle.spatial.network.lod.PartitionBlobTranslator11g</partitionBlobTranslator>
but when I change it to
<readPartitionFromBlob>true</readPartitionFromBlob>
               <partitionBlobTranslator>oracle.spatial.network.lod.PartitionBlobTranslator11gR2</partitionBlobTranslator>
The application starts without the obove mentioned error.

MSGraph maximum array size is 3999 elements

I just spent a couple of hours debugging and it seems that 2D array size in MSGraph cannot exceed 3999 elements. I am using MS Office 11 beta2 and office reporting toolkit. Some of my data sets were larger than 3999 and I was getting cryptic error messages. NI search did not yield any additional info so I am posting this for future searches. NI could have added some error checking if this really a case.
Any ideas on how to easily plot arrays larger than that.
Thanks
RK

I have never used MSGraph, but I recently used Excel 2000 to graph a chart that was 10000 by 3. This should solve your problem (unless, of course, I have misunderstood it--let me know).
Sean

Array size in Analog Tacho Processing vi

Hi
I would like to know more about what Analog Tacho Processing vi does particularly on the array size that it generates.
Attached is an example of vi that comes with LabVIEW. I used the array size function to show the size of the signal before passing thru the Analog Tacho Processing vi, and after the signal passes it. When we run the PC fan runup.dat file (which can be found in the LabVIEW order analysis Example Data), we can see that the array sizes for before and after passing thru the Analog Tacho Processing vi are 58368 and 1455, respectively. What I would really want to know is how the 1455 is generated.
Any help is greatly appreciated.
Thanks
Attachments:
Getting Started Exercise_Order Analysis.vi ‏330 KB

Since the Express VI calculates rotational speed based on pulses per revolution, it will use those pulses to calculate the speed profile. For example your input waveform may have 1000 data points to describe 3 pulses, the VI is going to just use those 3 physical pulses to determine rotational speed (based on the value you set for pulses per revolution). Thus you will never see the same number of points on the input and output of this VI. If you are trying to determine the exact formula it is using I will not really be able to help you with that.
My best suggestion would be to use context help and the detailed help for that VI, you can also right click and open the front panel of the Express VI if you are so inclined.
Happy Programming!
Kyle
Applications Engineer
National Instruments

Dynamic Array Size

I am retrieving records from the database and need to populate them into a one dimensional Array.
I need to get the count of the RecordSet and then set the size of the Array.
Is there a method to know the number of rows retrieved into the RecordSet.
Thanks for your help.

This question is asked weekly in the JDBC forum. Search the forums for the answer to it.

Setting array size, effect on memory

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