Array output from formula node with input variable as array size
Hi,
I have created a formula node with an array output called al, but I get an error "you have connected a scalar type to an array with that type".
I declare the output as follows..
float64 al[len_as];
where len_as is an scalar input to the formula node.
It only works when I put a number as.
float64 al[5];
,but I don't know beforehand how many elements I need, so I cannot use this.
Please help! This is so stupid.
Thanks
Don't define your array in your formula node.
Initialize the array as the size you want and pass it in as an input into the formula node.
Are you sure you even need to use a formula node? Can you implement your formula using all native LabVIEW functions?
Message Edited by Ravens Fan on 10-07-2009 11:51 PM
Attachments:
Example_VI_BD.png 3 KB
Similar Messages
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Array output from formula node
How to get an array output from the formula node.I am trying to use a for loop inside the formula node and want an array output.
You cannot place a For or While Loop inside the formula node.
Here is what the Help Description says about the syntax inside the Formula Node:
Formula Node
Evaluates mathematical formulas and expressions similar to C on the block diagram. The following built-in functions are allowed in formulas: abs, acos, acosh, asin, asinh, atan, atan2, atanh, ceil, cos, cosh, cot, csc, exp, expm1, floor, getexp, getman, int, intrz, ln, lnp1, log, log2, max, min, mod, pow, rand, rem, sec, sign, sin, sinc, sinh, sizeOfDim, sqrt, tan, tanh. There are some differences between the parser in the Mathematics VIs and the Formula Node.
Place on the block diagram
Find on the Functions palette
Refer to Creating Formula Nodes and Formula Node Syntax for more information about the Formula Node and the Formula Node syntax.
Note The Formula Node accepts only the period (.) as a decimal separator. The node does not recognize localized decimal separators.
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Formula node with global variable
Hi,
I am tring to use formula node with global variables as an input and output,
but this is where I see the SW hangs forever.
By the way I am a novice to the labview.
Can some give me hint why this is happening?
Thank you in advance,
Do
Solved!
Go to Solution.
Attachments:
formula_node_wGlobalInputOutput.JPG 281 KBWell, the first case of the two loops has a direct LabVIEW translation like this:
However, just because that's the direct translation doesn't mean that's what you should be doing. In the formula node it seems as if you were copying elements from one array to another. Element-wise operation on arrays via loops can be quite inefficient in LabVIEW. Often one can operate in place with arrays, and an operation that would require two loops in a language like C would actually require no loops in LabVIEW. In fact, with the above example, even if you were to use loops, arrays can auto-index for-loops so you don't even need to wire the constants to the N terminals to tell the loop(s) how many times to run.
Can you describe what you're trying to accomplish? There's likely to be a more natural way to do it in LabVIEW that would require no loops. Have you gone through the tutorials? You can also 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. -
Boolean input & output from formula node?
Hi All,
How do you declare input and output variables to be boolean in the formula node. See attached example, I want leak and prev to be of type boolean.
Thanks,
SeanHere's an example of how you could simplify the boolean portion of the code:
oh yeah... pretend the boolean constant and indicator are Shared Variables
Message Edited by Ray.R on 10-13-2009 01:06 PM
Attachments:
reducedCode.PNG 4 KB -
Array Handling in Formula Node
I have attached a simple VI wherein I want to take an input array, look at its size and use the size of the input array as the size of the output array. The output array needs to be declared. I want to be able to use the size of the input array "N" as the size of the output array too. The size of the input array changes dynamically based on my simulation needs. I dont want to modify the size of the array in the declaration every time I change the array size in simulation.
I have tried using b[N] instead of b[10] in the formula node. However LV does not seem to accept this and gives me a syntax error.
Attachments:
Array Handling in Formula node.vi 8 KBAGovi wrote:
However I require to use complicated formulas such as
If a simple formula is easier in G, a complicated formula will also be easier in G.
Actually, it will scale better. Since graphical code is 2D, doubling the code will make it only 1.4x (sqrt2) larger in each dimension, while the formula will double in lenght.
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How can I increment the index of an array in a formula node?
Hi,
I need some help with the formula node. I need an array, that increment every iteration of the code in the formula node. I need it to save amplitudes.
I thought i could do this with i++; i is the variable for my index.
Martin
Solved!
Go to Solution.Hello,
does it sound well to you ?
@+
Tinnitus
ps: sorry posts mixed
Message Edité par tinnitus le 12-15-2008 03:05 AM
CLAD / Labview 2011, Win Xp
Mission d'une semaine- à plusieurs mois laissez moi un MP...
RP et Midi-pyrénées .Km+++ si possibilité de télétravail
Kudos always accepted / Les petits clicks jaunes sont toujours appréciés
Don't forget to valid a good answer / pensez à valider une réponse correcte
Attachments:
inc_node.vi 6 KB -
I want to take the Y value (being the amplitute) from the input signal and put it into a formula node. I keep getting the error signal as in the attached VI. Is there a way of seperating the value in labview?
Attachments:
Formula signal.vi 32 KBHi Cork,
yes, it's possible! And WTH: you can do it without a formula node with ready-to-use functions!
Best regards,
GerdW
CLAD, using 2009SP1 + LV2011SP1 + LV2014SP1 on WinXP+Win7+cRIO
Kudos are welcome -
From Clause query with form variables
forms 9.0.4 rdbms 9.2
Is it possible to create a From Clause query with form variables generated from another block (but in the same form)? I am not having any success.
I searched Metalink. It appears that according to DOC ID # 69884.1, in Forms 6i, this is not possible. Metalink suggest in DOC ID 104771.1 implementating a dynamic From Clause, but when I duplicate the example on my system, I receive an Oracle error. Further investigation from the web form (DISPLAY ERROR) indicates that the system does not see the dynamic value.
Has anyone else run into this error? Has this been fixed in forms 9.0.4 and I am just missing something? Does a dynamic from clause query work? Can anyone point me to an example or post an example or offer any advise.
thanks in advanceAs far as I know it is not possible to use block items in a from clause query in forms 9.0.4. Here is my solution for a From-Clause-Query via the 'Query-Data-Source-Name-Property':
To use the values of the block items in my from clause query I implemented a database package with getter and setter routines for the block item values I needed for the query.
In the Key-Exeqry-Trigger of the From-Clause-Query-Block I set the global package variables with values of the block-items I am interested in. In the From-Clause-Query I used the values in the where-clause via package functions which return the global package variables.
Hope my solution will work for your problem. -
Cannot Access Shortcut Menu for Adding Input/Output in Formula Node
This is a wierd problem. I cannot access the shortcut menu in formula node. I right click the border, nothing happens. Anyone run into this before? Is there any other way to add inputs and outputs?
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Go to Solution.As the saying goes, "when you hear hoofbeats, think horses and not zebras". Let's get a few things out of the way.
Is the VI in edit mode?
Is autotool on?
Drop a fresh FN on a New VI and try it again.
The only other way I know to add/remove inputs is scripting, let's not go there.
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I have a Parent class on the FPGA that will serve as a template/framework for future code that will be developed. I had planned on creating a child class and overriding a couple methods. The child class constant would be dropped on the block diagram so the compiler wouldn't have any trouble figuring out which method (parent's or child's) should be used (i.e. the parent's method will never actually be used and won't be compiled with the main code). The output of one of the methods is an array. This array will have a different size depending on the application. I defined the array size as variable. In the child method, there is no question about the size of the array so the compiler should be able to figure it out. However, when I try to compile, I get an error about the array size. I can't figure out any way around it. Any thought would be greatly appreciated!
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Attachments:
FPGA Test.zip 1194 KBWait what?
Can we use dynamic dispatch VIs on FPGA? Really? I was completely unaware of this. Obviously the dependencies need to be constant and known at compile time but...... This would have saved me a lot of headaches in the last few months.
Since which LV version is this supported?
Say hello to my little friend.
RFC 2323 FHE-Compliant -
Can't create float array with a variable name as size parameter?
Hi,
When trying to compile code that users a variable in the array subscript to set the size, CC gives the following error:
Error: An integer constant expression is required within the array subscript operator.
1 Error(s) detected.The code is as follows:
int main()
//blah blah
const int arrSize = numberVariables;
float tempArr[arrSize];
//blah blah
}Output from CC -V:
unknown% CC -V
CC: Sun C++ 5.9 SunOS_i386 Patch 124864-01 2007/07/25Output from uname -a:
unknown% uname -a
SunOS unknown 5.10 Generic_137138-09 i86pc i386 i86pcAny ideas on why CC is giving that error?
~Slow
Edited by: SlowToady on Nov 15, 2008 8:28 PM
Edited by: SlowToady on Nov 15, 2008 8:36 PMMarc_Glisse wrote:
Last time I checked, I did not see VLAs in the draft of the next C++ standard, which I believe is now feature complete. So either I missed it (quite possible) or VLAs were considered a bad idea (for C as well many people consider alloca and VLA bad ideas). It is however a very reasonable extension to have (care to file a RFE?).The following code performs like this on an IBM x366 with 4 single-core 3.16 GHz Xeons, running OpenSolaris build 96:
-bash-3.2$ ./thrtest
malloc() took 440895924 ns
alloca() took 2122522 ns
-bash-3.2$Using alloca is two hundred times faster.
Two hundred times faster.
Think about that next time some pedant says alloca "sucks".
Try for yourself. Here's the code:
#include <stdlib.h>
#include <pthread.h>
#include <alloca.h>
#include <strings.h>
#include <stdio.h>
#define NUM_THREADS 8
#define ITERS 10000
#define BYTES 1024
typedef void ( *mem_func_t )( void );
void alloca_iter()
char *ptr;
ptr = ( char * ) alloca( BYTES );
memset( ptr, 0, BYTES );
return;
void malloc_iter()
char *ptr;
ptr = ( char * ) malloc( BYTES );
memset( ptr, 0, BYTES );
free( ptr );
return;
void *thread_proc( void *arg )
mem_func_t mem_iter;
mem_iter = ( mem_func_t ) arg;
for ( int ii = 0; ii < ITERS; ii++ )
mem_iter();
return( NULL );
int main( int argc, char **argv )
pthread_t tids[ NUM_THREADS ];
void *results[ NUM_THREADS ];
hrtime_t start;
hrtime_t end;
int ii;
start = gethrtime();
for ( ii = 0; ii < NUM_THREADS; ii++ )
pthread_create( &tids[ ii ], NULL, thread_proc, malloc_iter );
for ( ii = 0; ii < NUM_THREADS; ii++ )
pthread_join( tids[ ii ], &results[ ii ] );
end = gethrtime();
printf( "malloc() took %ld ns\n", end - start );
start = gethrtime();
for ( ii = 0; ii < NUM_THREADS; ii++ )
pthread_create( &tids[ ii ], NULL, thread_proc, alloca_iter );
for ( ii = 0; ii < NUM_THREADS; ii++ )
pthread_join( tids[ ii ], &results[ ii ] );
end = gethrtime();
printf( "alloca() took %ld ns\n", end - start );
return( 0 );
} -
How to pass output from one selection-as input to another selectiion??
From a user prompt will iniate many user table selections. And the outputs of each table selection will be used as inputs for the next table selection
I reviewed variable Scope and inner and outer Declare—it would be a great help if some one could give me a example of the right approach??
see sample script :
Thank you so much for your help
---------------------------- Section_01_UserInput.sql -------------------------
-- THIS SECTION OF THE SCRIPT IS TO PROMPT THE USER FOR THE MODEL NAME AND THE ORGANIZATION CODE (e.I...M1,M2,M3...._)
-- THE ORGANIZATION WHERE MODEL WAS CREATED IS THE ONLY PLACE WHERE YOU WOULD FIND THE BILL_SEQUENCE_ID
-- THE COMMON ORGANIZATIONS DO NOT HAVE COMPONETS THEY JUST REFERENCE TO THE ORHANIZATION THAT MODEL WAS CREATED
SET VERIFY OFF
SET ECHO OFF
ACCEPT v_assemblyName CHAR DEFAULT myDefaultAssemblyName PROMPT 'Enter Assembly name:'
ACCEPT v_OrganizationCode CHAR DEFAULT myDefaultOrganizationCode PROMPT 'Enter the Org where the MODEL WAS CREATED :'
SELECT a.organization_code, a.organization_id, b.inventory_item_id, b.segment1, b.description
FROM mtl_parameters a, mtl_system_items_b b
WHERE a.organization_code = '&v_OrganizationCode'
AND
b.segment1 ='&v_assemblyName'
AND
b.organization_id = a.organization_id;
SET VERIFY ON
SET ECHO ON
----OUTPUT of the Section_01_UserInput.sql QUERY---
ORGANIZATION_CODE ORGANIZATION_ID INVENTORY_ITEM_ID SEGMENT1 DESCRIPTION
M1, 207, *[225957]* , CN927779, Sentinel Custom Desktop
----------------------------- Section_02_bom_structures_b.sql ------------------
-- List all option class Bill of Materials for a single ATO or PTO model
-- List of bill_sequence_id and all component_item_id's that belong to that
-- bill_sequence_id
SELECT a.assembly_item_id, a.bill_sequence_id, b.bom_item_type, b.component_item_id
FROM bom_structures_b a, bom_components_b b
WHERE a.assembly_item_id = *['225957']*
AND
b.bill_sequence_id = a.bill_sequence_id
AND
b.bom_item_type = '2'; -- OPTION Class's are identified by bom_item_type
----OUTPUT of the Section_02_bom_structures_b.sql QUERY---
ASSEMBLY_ITEM_ID ORGANIZATION_ID BILL_SEQUENCE_ID BOM_ITEM_TYPE BILL_SEQUENCE_ID COMPONENT_ITEM_ID
*[225957]* , 207 , *[90754]* 2 90754 *[297]*
*[225957]* , 207 , *[90754]* 2 90754 *[299]*
*[225957]* , 207 , *[90754]* 2 90754 *[301]*
----------------------------- Section_03A_bom_structures_b.sql-------------------
-- List all the components under the option class
-- When no components are found with bom_item_type ='4' which means that this assembly has no
-- components in the bom_components_b because the assembly is a child that is a option class.
-- We need to run this script with a bom_item_type ='2' and stored the component_item_id into MEMORY_assembly_id
-- and run script again by read from MEMORY_assembly_id and bom_item_type = '4';
SELECT a.assembly_item_id, a.organization_id, a.bill_sequence_id, b.bom_item_type, b.bill_sequence_id, b.component_item_id
FROM bom_structures_b a, bom_components_b b
WHERE a.assembly_item_id = '297'
AND
b.bill_sequence_id = a.bill_sequence_id
AND
b.bom_item_type = '4';
----OUTPUT of the Section_03A_bom_structures_b.sql QUERY---
ASSEMBLY_ITEM_ID ORGANIZATION_ID BILL_SEQUENCE_ID BOM_ITEM_TYPE BILL_SEQUENCE_ID COMPONENT_ITEM_ID
*[297]* 207 *[384]* 4 384 *[185]*
*[297]* 207 *[384]* 4 384 *[241]*
*[297]* 207 *[384]* 4 384 *[249]*
*[297]* 207 *[384]* 4 384 *[4747]*
*[297]* 207 *[384]* 4 384 *[4749]*
*[297]* 207 *[384]* 4 384 *[4751]*
=================================================================================================
note output FROM EACH SELECT that needs to be passed to the next SELECT statement are *[ ]* for example *['225957'] see below:*
----OUTPUT of the Section_01_UserInput.sql QUERY---
ORGANIZATION_CODE ORGANIZATION_ID INVENTORY_ITEM_ID SEGMENT1 DESCRIPTION
M1, 207, *[225957]* , CN927779, Sentinel Custom Desktop
----OUTPUT of the Section_02_bom_structures_b.sql QUERY---
ASSEMBLY_ITEM_ID ORGANIZATION_ID BILL_SEQUENCE_ID BOM_ITEM_TYPE BILL_SEQUENCE_ID COMPONENT_ITEM_ID
*[225957]* , 207 , *[90754]* 2 90754 *[297]*
*[225957]* , 207 , *[90754]* 2 90754 *[299]*
*[225957]* , 207 , *[90754]* 2 90754 *[301]*
----OUTPUT of the Section_03A_bom_structures_b.sql QUERY---
ASSEMBLY_ITEM_ID ORGANIZATION_ID BILL_SEQUENCE_ID BOM_ITEM_TYPE BILL_SEQUENCE_ID COMPONENT_ITEM_ID
*[297]* 207 *[384]* 4 384 *[185]*
*[297]* 207 *[384]* 4 384 *[241]*
*[297]* 207 *[384]* 4 384 *[249]*
*[297]* 207 *[384]* 4 384 *[4747]*
*[297]* 207 *[384]* 4 384 *[4749]*
*[297]* 207 *[384]* 4 384 *[4751]*
Edited by: user612347 on Mar 16, 2010 4:21 PM
Edited by: user612347 on Mar 16, 2010 4:57 PMHi,
Sorry, it's unclear what you want to do.
Whenever you have a problem, it helps to be as specific as you can.
Post a little sampel data (CREATE TABLE and INSERT statements) and the results you want from that data. Since your problem involves parameters, give a couple of sets of parameters, and the results you want for each set, given the same data.
Are you saying that, after the user enters one set of parameters, you will need to run a variation of this query:
SELECT a.assembly_item_id, a.organization_id, a.bill_sequence_id, b.bom_item_type, b.bill_sequence_id, b.component_item_id
FROM bom_structures_b a, bom_components_b b
WHERE a.assembly_item_id = '303'
AND
a.organization_id = '207'
AND
b.bill_sequence_id = a.bill_sequence_id
AND
b.bom_item_type = '4';several times? What will be different each time? Will the hard-coded strings in the WHERE clause ('303', '207' and '4') be values from the earlier query?
Do you really want to run this query several times, or would you rather run one query, and have it produce results for all the relevant values? (That would probably be eaisest and less error-prone). When you post your desired results, post what you would most like to see. If something else is acceptable, describe it.
You can write SQL*Plus scripts to use parameters (substitution variables.
For example, you can write a query that says:
WHERE a.assembly_item_id = '&1'
AND a.organization_id = '&2'
AND b.bill_sequence_id = a.bill_sequence_id
AND b.bom_item_type = '&3';and call it like this
@Section_03A_bom_structures_b 303 207 4You can have a query output several such rows (for example:
@Section_03A_bom_structures_b 303 207 4
@Section_03A_bom_structures_b 304 298 3
@Section_03A_bom_structures_b 306 99 4), send all of that output to a SPOOL file, and then execute the SPOOL file. -
I would like to cut and past in a list of comma seperated numbers and initialize an array of float32. Something like this would work in C.
float32 data[5] = {0,1,2,3,4};
Labview does not like this syntax when using a formula node. I have to do the following instead
float32 data[5];
data[0] = 0;
data[1] = 1;
What is the correct syntax for initializing arrays in lavview using a formula node. I would be amazed if Labview does not have this basic functionality.
thanks in advance
jim boblabview_noob wrote:
ttt, no one?
Probably because we are using LabVIEW to get away from text based code.
(I don't know if there is a syntax for the formula node, it's been too long. )
If you have LabVIEW 8.0 or higher, you can use matlab like sytax in a mathscript node. Of course you could just paste your list into a string constant and get the values with "spreadsheet string to array".
Message Edited by altenbach on 07-25-2007 12:24 AM
LabVIEW Champion . Do more with less code and in less time .
Attachments:
ArrayFormula.png 13 KB -
How I can transfer data from the database into a variable (or array)?
I made my application according to the example (http://corlan.org/2009/06/12/working-in-flash-builder-4-with-flex-and-php/). Everything works fine. I changed one function to query the database - add the two parameters and get the value of the table in String format. A test operation shows that all is ok. If I want to display this value in the text area, I simply drag and drop service to this element in the design mode
(<s:TextArea x="153" y="435" id="nameText" text="{getDataMeanResult.lastResult[0].name}" width="296" height="89" />).
It also works fine, just a warning and encouraged to use ArrayCollection.getItemAt().
Now I want to send the value to a variable or array, but in both cases I get an error: TypeError: Error #1010: A term is undefined and has no properties..
How can I pass a value from the database into a variable? Thank you.
public var nameTemp:String;
getDataMeanResult.token = authors.getDataMean(arrayOfNumber[0], dir_id);
nameTemp = getDataMeanResult.lastResult[0].name;
public var nameArray:Array = new Array();
for (var i:uint=o; i<3; i++){
getDataMeanResult.token = authors.getDataMean(arrayOfNumber[i], dir_id);
nameArray[i] = getDataMeanResult.lastResult[0].name;
And how i can use syntax highlighting in this forum?Astraport2012 wrote:
I have to go back to the discussion. The above example works fine when i want to get a single value of the database. But i need to pass an array and get an array, because i want to get at once all the values for all pictures tooltips. I rewrote the proposed Matt PHP-script and it works. However, i can not display the resulting array.
yep, it won't work for Arrays, you'll have to do something slightly more intelligent for them.
easiest way would be to get your PHP to generate XML, then read that into something like an ArrayList on your HTTPService result event (depends what you're doing with it).
for example, you could have the PHP generate XML such as:
<pictures>
<location>test1.png</location>
<location>test2.png</location>
<location>test3.png</location>
<location>test4.png</location>
<location>test5.png</location>
<location>test6.png</location>
</pictures>
then you'll read that in as the ResultEvent, and perform something like this on it
private var tempAC:ArrayList = new ArrayList
protected function getStuff_resultHandler(event:ResultEvent):void
for each(var item:Object in event.result.pictures)
var temp:String = (item.@location).toString();
tempAC.addItem(temp);
in my example on cookies
http://www.mattlefevre.com/viewExample.php?tut=flash4PHP&proj=Using%20Cookies
you'll see an example of how to format an XML structure containing multiple values:
if($_COOKIE["firstName"])
print "<stored>true</stored>";
print "<userInfo>
<firstName>".$_COOKIE["firstName"]."</firstName>
<lastName>".$_COOKIE["lastName"]."</lastName>
<userAge>".$_COOKIE["userAge"]."</userAge>
<gender>".$_COOKIE["gender"]."</gender>
</userInfo>";
else
print "<stored>false</stored>";
which i handle like so
if(event.result.stored == true)
entryPanel.title = "Welcome back " + event.result.userInfo.firstName + " " + event.result.userInfo.lastName;
firstName.text = event.result.userInfo.firstName;
lastName.text = event.result.userInfo.lastName;
userAge.value = event.result.userInfo.userAge;
userGender.selectedIndex = event.result.userInfo.gender;
depends on what type of Array you're after
from the sounds of it (with the mention of picture tooltips) you're trying to create a gallery with an image, and a tooltip.
so i'd probably adopt something like
<picture>
<location>example1.png</location>
<tooltip>tooltip for picture #1</tooltip>
</picture>
<picture>
<location>example2.png</location>
<tooltip>tooltip for picture #2</tooltip>
</picture>
<picture>
<location>example3.png</location>
<tooltip>tooltip for picture #3</tooltip>
</picture>
etc...
or
<picture location="example1.png" tooltip="tooltip for picture #1"/>
<picture location="example2.png" tooltip="tooltip for picture #2"/>
<picture location="example3.png" tooltip="tooltip for picture #3"/>
etc... -
Labview eval formula node with VI
The VI has been attached this time
I really have no idea why it doens't work
please help
thanks
====================
=Labview 7.0 & 8.0 & 8.5=
=====================
Attachments:
Untitled.vi 37 KBIt seems to work fine. Make sure that all inputs are defined. I have attached your example showing some simple inputs set as default values, just run it and see.
(E.g. remember that "variables output" is actually an input that needs to be defined!)
LabVIEW Champion . Do more with less code and in less time .
Attachments:
Formula.vi 29 KB
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