Building an array

me again. how do i build an array in sqlplus or pl/sql that gives me a list of all my sql scripts and i can enter the number beside the script and it will run and then return to my menu?
Thanks,
Lorenzo

Looks like you've resolved this issue in this thread:
http://forums.ni.com/ni/board/message?board.id=170&message.id=169645

Similar Messages

How can I build an array not knowing final size at startup?

Hi,
I need to be able to build an array with a certain number of rows but that number is not known at runtime. Instead it can't exceed 5 in a certain time period. So my question is: every 20 seconds I need to send out the 5 row array but if lets say 10 rows of data come in in 20 seconds I am not sure how to handle the data to have it build 2 arrays and send them out one after another at the elapse of the 20 seconds as opposed to just sending an array with 10 rows and losing half the data on the receiving side. Please any help will be appreciated,
Alex

I understand that you have to send a least a message every 20 seconds (could be empty ?), but can you send more messages if you get more data (e.g. 3 message of 5 rows in 20 sec) ?
If you can, then all you have to do is to trigger the sending of a message each time the array size reaches 5, or if 20s ellapsed since last sent message.
Here is an example, using shift registers. there is a random data generation so that you can see it working (if you set the time between data long enough, then you will see the data sent after 20 sec. Well not exactly 20 sec, but i guess you can figure this out later by yourself...)
I hope this will be of any help
Attachments:
dynamic_array.vi ‏36 KB

Best Way To Build An Array Of Many Elements

Simple question for you LabVIEW experts: I want to build an array of many element for use in my code. The problem is I have 20 elements I need to insert into the "Build Array Function." This takes up much code space and is really not that clean. I was thinking of using a For Loop and use the iteration terminal as the index for each element. The For Loop would then use auto indexing and build this array for me.
Is there a more efficient way to do this? Thanks!

hobby1 wrote:
Crossrulz, I was planning on handling it like this:
I have a total of 17 element I need to build an array from. Each case would include another element to be written to the array. Is this the correct way to handle this?
Thats one way to do it. Not nearly as efficient as using the Build Array, but it will work.
There are only two ways to tell somebody thanks: Kudos and Marked Solutions
Unofficial Forum Rules and Guidelines

How to build a array with collected data

Hi,
I have collected data from serial port with VISA. Now I want to build a array with 100 date points. Should I connect VISA Read with Build Array directly? How to do it?
PS: All of them are in a While Structure.
Thank you!

An inefficient way to create the array is to use the build array and a shift register as shown below. It's more effecient in terms of memory management to create the array and then use the replace array subset as shown in the other image. Of course, if you don't need the array inside the loop, just wire the value out of the while loop and on the exit tunnel, right click and select 'Enable Indexing'.
Message Edited by Dennis Knutson on 07-03-2007 10:25 PM
Message Edited by Dennis Knutson on 07-03-2007 10:26 PM
Attachments:
Crude Build Array.PNG ‏4 KB
Better Build Array.PNG ‏6 KB

How to build a array with high sampling rates 1K

Hi All:
Now I am trying to develop a project with CRio.
But I am not sure how to build a array with high sampling rates signal, like >1K. (Sigle-point data)
Before, I would like to use "Build Arrary" and "Shift Register" to build a arrary, but I found it is not working for high sampling rates.
Is there anyother good way to build a data arrary for high sampling rates??
Thanks
Attachments:
Building_Array_high_rates.JPG ‏120 KB

Can't give a sample of the FPGA right now but here is a sample bit of RT code I recently used. I am acquiring data at 51,200 samples every second. I put the data in a FIFO on the FPGA side, then I read from that FIFO on the RT side and insert the data into a pre-initialized array using "Replace Array subset" NOT "Insert into array". I keep a count of the data I have read/inserted, and once I am at 51,200 samples, I know I have 1 full second of data. At this point, I add it to a queue which sends it to another loop to be processed. Also, I don't use the new index terminal in my subVI because I know I am always adding 6400 elements so I can just multiply my counter by 6400, but if you use the method described further down below , you will want to use the "new index" to return a value because you may not always read the same number of elements using that method.
The reason I use a timeout of 0 and a wait until next ms multiple is because if you use a timeout wired to the FIFO read node, it spins a loop in the background that polls for data, which rails your processor. Depending on what type of acquisition you are doing, you can also use the method of reading 0 elements, then using the "elements remaining" variable, to wire up another node as is shown below. This was not an option for me because of my programs architecture and needing chunks of 1 second data. Had I used this method it would have overcomplicated things if I read more elements then I had available in my 51,200 buffer.
Let me knwo if you have more qeustions
CLA, LabVIEW Versions 2010-2013
Attachments:
RT.PNG ‏36 KB
FIFO read.PNG ‏4 KB

Building an array of movie clips

Hi
I have a main document class and an array class (amongst others).
I am not sure how to build the array though. Below is my attempt up to now. But I get the following error code.
TypeError: Error #1009: Cannot access a property or method of a null object reference.
    at LetterArray/initLetters()
    at LetterArray()
    at BugGoopFSGame() //This is my main document class.
What am I doing wrong?
Thanks
Charine
//in main document class
public var letterArray:LetterArray = new LetterArray(stage);
//in array class
package
    import flash.display.MovieClip;
    import flash.events.Event;
    import flash.events.MouseEvent;
    import flash.display.Stage;
    public class LetterArray extends MovieClip
        private var _stage:Stage;
        /*The following are movie clips that need to go into an array so that they can be manipulated togehter.
        Their classes A, F, G, H, I, N, O, S and T were all dynamically created by flash.*/
//Do I even need these here?
        public var a:A;
        public var f:F;
        public var g:G;
        public var h:H;
        public var i:I;
        public var n:N;
        public var o:O;
        public var s:S;
        public var t:T;
         public function LetterArray(s:Stage)
            _stage = stage;
            initLetters();
        private function initLetters():void
            var LetterArray:Array = new Array[a,f,g,h,i,n,o,s,t];
//rest not relevant

You declare a bunch of objects but you do not instaintiate them.
public var a:A; // declare but does not yet exist
public var a:A = new A();   // declared and exists

Efficiently building an array of increasing values for a graph

I need to build an array of values increasing by 3E-8. Initializing an array and changing each value in a while loop works fine, but it is terribly slow. Is there a better (faster) way of building an array of increasing values like this?

Thanks for the suggestion, it looks like that could do what I'm looking for. A kind tech solved the problem for me by phone -- I knew it was reading and writing the entire 100,000 element matrix to memory at each step, but I couldn't figure out how to get it to stop. A shift register brought the run time from over 2 minutes to under 1 second.
Thanks again for responding!
Message Edited by Deamiter on 11-07-2006 06:46 PM

Building an array of difference values

Dear Forum Members,
With reference to the attached LabVIEW 2010 Student Edition file....
From the incoming data via the .csv 'Read From Spreadsheet' I want to display an array of the difference between the n and n-1 data value i.e. if the data set is 10, 20, 25, 35, 50 then the difference will be 10, 5, 10, 15.
I have used the 'Index Array' function to extract the n and n-1 data values (using the 'Simulation Time' function as the Index Row incrementer) however I cannot find the way to build an array of these difference values and display them in the Front Panel i.e.
10
5
10
15
This will no doubt be a trivial issue for those more experienced LabVIEW programmers. Any advice or assistance will be gratefully received.
Kind regards,
Solved!
Go to Solution.
Attachments:
Plant_Simulator (04-05-2013).vi ‏158 KB

I'll explain what I want to do again for clarity....
I have a simple spreadsheet file (in .csv format) that contains one (1) column of data x 800 rows (thats 800 elements). I read the data into LabVIEW via the 'Read from Spreadsheet' function (I have already established this). I then want to make an array that is the difference beween the n and n-1 data value. Hence if the data set is 10, 20, 25, 50... then the difference will be 10, 5, 25..
I want to display the difference array to screen in an indicator that shows all the difference values in one (1) column x 799 rows. Hopefully that explains what I want to achieve.
I tried the suggestion with the loop however there were multiple errors when this was attempted. I cannot place the loop within the simulation frame (it doesn't allow it) hence its outside.
Please excuse my inexperience concerning the array order(s), I find LabVIEW to be particularly unfriendly in this respect and its the source of much of my frustration and pain whenever I'm using LabVIEW to implement anything.
Regards,

Issue with building an array from a cfhttp request result.

Here is what I am trying to do. Retrieve a bunch of results from a REST request. Run a query to see if I should be excluding any of the xmltext entries coming back from the rest request. Build an array of the REST xmltext entries except the entries in the cfquery.
I have it all workign except building the array minus the entries that came back in the cfquery. Here is my code so far.
<cfquery name="getqueue" datasource="#application.settings.dsn#">
select * from friends
where Deactivatedate < #DATEADD('d', 1, CreateODBCDateTime(now()))#
</cfquery>
<cfoutput query = "getqueue">
<cfhttp blah blah>
<cfset nodes_parse = XmlParse(CFHTTP.FileContent)>
<cfset Nodes = xmlSearch(nodes_parse,'friends/friend/date/activedate/')>
<cfset roleArray = ArrayNew(1)>
<cfloop from="1" to="#arraylen(Nodes)#" index="i">
<cfset NodeXML = xmlparse(Nodes[i])>
<cfset ArrayAppend(roleArray, '[sel_members][]=#NodeXML.activedate.xmlText#&')>
</cfloop>
</cfoutput>
My issue is down in the loop where I do the arrayappend. How would I build an array of values coming back from the cfhttp request but not include any of them if they match up with anything coming back from the getqueue query?

What about the obvious? Namely,
<cfif value_from_getqueue IS NOT value_from_cfhttp_request>
<cfset arrayAppend()>
</cfif>

Building an array to a specified format..

I'm trying to build an array that follows a specified output format. The user inputs columns & rows e.g. C x R...amd the the output should read
C1 C2 C3 C4.....
R1 V V V V....
R2 V V V V ...
Where each V is not a constant, but a user inputed value. Sorta like a matrix in appearance.
Any ideas??

You can use a table control and use a property node to set the number of rows and columns. But that just sets the number of rows and columns which are visible. The user can navigate to additional rows and columns.
You could create an event structure to keep the user within the specified bounds. You could also remove the scrollbars (right-click on table, goto Visible Items, the deselect Horizontal Scrollbar and Vertical Scrollbar).

How do I build this array?

I have a vi that generates two time intervals in ms. One interval is between the time a light turns on and button 1 is released (time 1). The other interval is the time between the same release and the press of button 2 (time 2).
The vi loops through the light flashing/button press sequence until the number of set trials equals
the number of correct trials.
I want to build an array that records time 1 and time 2 for each trial. Something like this
0.1200 1.3123
0.2400 1.8979
0.3423 2.4567
etc.
The way I've got it, the array ends up being just time 1 and time 2 from the last trial.
0.3423 2.4567
How do I set this up to do what I want.
My vi is attached.
Attachments:
newredconstant.vi ‏99 KB

Hope this help!
Cheers!
Ian F
Since LabVIEW 5.1... 7.1.1... 2009, 2010
依恩与LabVIEW
LVVILIB.blogspot.com
Attachments:
Array.vi ‏26 KB

Build 1D array using for loop

Hi guys,
I am testing out array. How do I create a 1D array of x-y using for loop?

Nextal wrote:
I am testing out array. How do I create a 1D array of x-y using for loop?
OK, first of all you did not say what the array should contain. If you want an array that has one array element for each iteration of the while loop, you need to first think a bit harder. Your outer loop has no wait, thus it will spin millions of times per second and you will run out of memory soon, no matter how much memory you have. How many times should the while loop iterate? If you know the number before the program starts, you would use a FOR loop and autoindex at the loop boundary.
If you want to use a whiile loop, you need a mechanism to keep the array size reasonable. For small final arrays, you can just build the array in a shift register if you need it updated as it happens. If you only need the array after the loop stops, you can autoindex at the right loop boundary.
In any case, you should take a step back and decide what you really want. Currently the specifications are very vague and unreasonable.
LabVIEW Champion . Do more with less code and in less time .

Methods to build an array inside a For Loop.

Let me introduce to you my nested For Loops:
They output a 2D boolean array depending on two 1D boolean arrays of different lengths. This is all well and good however, in another part of my program, I want this to be a 1D array instead.
Idea #1:
"I'll just reshape the array at the end. Simples!"
Idea #2:
"Hang on, why am I using three primitives outside the loop when I can use just one inside it along with a shift register?"
Idea #2.5:
"Oh, wait... I remember reading somewhere about continuously building an array (with concatenate inputs) inside a loop being a bad thing and quite slow. Let me test this."
Spoiler (Highlight to read)
Idea #3:
"Umm... okay, so actually the second way is faster. I think if I initialize the shift register first then replace subsets of the array, that might also be better."
Spoiler (Highlight to read)
Idea #4:
"Yep - seems much better. (Something to do with LabVIEW not having to constantly allocate more memory on every iteration of the loop) Looking at this closer, I don't actually need the inner For Loop because of the way I'm handling the arrays. Try again...!"
Spoiler (Highlight to read)
Conclusion(?) #1:
"Well I seem to have arrived at something that looks messier, but executes about 6x faster than my initial idea. That said, the difference rapidly increases as the input arrays get much bigger (becoming orders of magnitude different)."
Is this the most efficient way of doing what I want? Or is there something even better (and works in LV 8.5)?
Never say "Oops." Always say "Ah, interesting!"

Thank you both for the feedback. It never occurred for me to recheck the logic after I'd initially extracted the nested For Loops, but the AND gate output is obviously the same now that it's been pointed out!
Continuing on with Idea #4, I replaced the Select with an AND then compared the times. (also meant I didn't have to initialize one of the arrays anymore)
Spoiler (Highlight to read)
It appears that the AND gate was slower but then I tried with different sizes of initial arrays and in one case, the timings were 'reversed'.
This only happened when the top array (the one that is fed into the AND gate whole) was reduced to a length in the region of 5 elements long.
Spoiler (Highlight to read)
Why does this happen? Is it something to do with the AND gate possibly being optimised for single element operations so smaller arrays are handled better...?
Never say "Oops." Always say "Ah, interesting!"

Help me for build a array as follows

Hi. I need build a array, with the number 10 in all positions of array. For example, if array is of size 10x10, the number 10 must appear in the 100 positions of array. But I need that the number go storing in array as follows: That store the number 10 in all row 1 of left to right, in row 2 of right to left and so on. I attached my VI, but i have a problem, the program make well the sequence but the number 10 no storing in some positions, this positions is inthe extrems of some row,i think that i need to maintain the number of column for two cicles, buy i don't know very....Help me.!!...Thanks!!
Solved!
Go to Solution.
Attachments:
Fotos_ejeX.vi ‏10 KB

You said you want your array to be 10x 10, but you initialized it to only 9 x 9.
Pay attention to where you increment your index. You are incrementing your index before you replace array subset. So on iteration 0, you wind up replacing at index 1 and completely missed index 0. Increment at the end of the loop after replacing the element, not before replacing the element.
I don't understand the comparisons to 15 and 8. That seems like odd comparisons when you would be looking at a range of 0 to 9. Something seems very awkward about comparing to those two numbers, and the use of 3 shift registers to track values when you are only incrementing two indices.
Yes you don't want to increment or decrement your index on the column in the iteration where you are also incrementing a row. So work that into your logic.
You probably want to stop your while loop when you hit stop OR you've reached the end of your replacements.
I would consider making two For Loops, one that iterates for rows, the inside one iterates for columns. Shift registers on both to maintain the array. Then use the i value of the inner loop to replace your element when you are in even rows, or the 9-i element when you are in odd rows.
Since your indices are integer values, you should be using the blue integer datatype rather than orange floating point wires.

Building 2D array in a while loop

I'm trying to build an array from hex data received from a serial device(using VISA) inside a while loop. Can I take the hex string(262 bytes long) and write it into the first element of an array? Everytime the loop is executed the next hex string I would like to store it into the next element of the array. Can someone give me some hints on how to get started or a basic vi that outlines building an array of this type in a while loop. Thanks.

Where is the 2D aspect of this? What you're describing sounds like a 1D array, and you can just use auto-indexing to do this.
To learn more about LabVIEW it is recommended that you go through the tutorial(s) and look over the material in the NI Developer Zone's Learning Center which provides links to other materials and other tutorials. You can also take the online courses for free.
Message Edited by smercurio_fc on 04-11-2008 04:07 PM
Attachments:
Example_VI_BD2.png ‏2 KB

Building an array

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