Formula Node error: left brace required ???

Hi,
I'm trying to use a formula node to do a simple line calculation. However I'm receiving this error and I'm not sure why.
Formula Node: left brace required
Error on line 1 is marked by a '#' character: "y = 0.0183*x -# 0.2982;"
I've tried replacing the y-intercept with a variable, but the same error results.
Anyone know what to do?
Thanks in advance.

What version of LV are you using? The formula:
y = 0.0183*x-0.2982;
works perfectly fine in V6.0.2...
Mike...
Certified Professional Instructor
Certified LabVIEW Architect
LabVIEW Champion
"... after all, He's not a tame lion..."
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Similar Messages

Formula node error: missing left parenthesis

Hi guys
I am new on labview and i am strugling to right a bit of code.
I am using formula node and i keep getting the error as above on the title moreover it displays: Error on line 5 is marked by a '#' character: " for {# H = 00.00.00 to H = 06.00".
I am attaching my file so that if you can give me a hand you could have a brief look.
Thank you
Solved!
Go to Solution.
Attachments:
time_look up test.vi ‏14 KB

Hi inaslab,
still your formula node doesn't make sense: You still overwrite the value for H in the first FOR statement...
What you want is either an IF-THEN-ELSE or a SWITCH/CASE construct like "IF (H>=0 AND H<6) THEN...". Right-click the formula node, select help, select formula node syntax !
And I'm even more convinced a standard LV case structure will be much more reasonable here: just wire H to the selector input...
Message Edited by GerdW on 10-29-2009 11:29 AM
Best regards,
GerdW
CLAD, using 2009SP1 + LV2011SP1 + LV2014SP1 on WinXP+Win7+cRIO
Kudos are welcome

Formula node error: missing left parenthesis

Im trying to compute a simple function in a formula node, I recieve the following errors:
Error on line 1 is marked by a '#' character: "X3=sin**#2(2*T);"
Error on line 1 is marked by a '#' character: "X5=(cos**#(2)(T);"

Has anyone else noticed the name of this guys VI ?
Thoric (CLA, CLED, CTD and LabVIEW Champion)

Formula node error: missing right parenthesis

Hi NI community,
I am working with the formula node structure for the first time and I came along this error which I can't fix.
It says it finds a # character, but the strange thing is that there is no character. Is there anyone who can help me with this one please?
Kind regards
Thomas Ruts
Solved!
Go to Solution.

You are missing a right parenthesis on your first long formula. It is in the last half of the formula. You have two left parenthesis, but only one right.
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Formula node error

Error using formula node with non-linear fitting VI.
I am using LV 2011 on windows XP.
Using Nonllinear Curve Fit.vi. I have used this before successfully.I am using the "formula string" instance of this polymorphic VI. When I run my program using the formula string "b0+b1*x", it runs fine and give sensible results. When I use the formula string "b0+b1*x+A1*x^2" I get the error message "Error -23083 has occurred at an unknown location. Analysis: Bracket problem at the end."
Attached screenshots show part of the block diagram that wrorks (lv0.bmp) and ppart of the block diagram that does not work (lv1.bmp).
Thank you.
Attachments:
lv0.jpg ‏23 KB
lv1.jpg ‏39 KB

Thank you Dennis. It turns out the "caret" ("^") operator is OK here, and is raising a number to a power, as desired. The problem was that I used an uppercase letter in a variable name. Not allowed! Nor can variable names have have two letters, although that wasn't the problem in my example. (It was a problem in some of my other attempts.)

Error on Formula Node :Error on line 1 is marked by a '#' character:

Hey!!
This is a part of my prog..
Whats the problem with the prog?
Error on line 1 is marked by a '#' character: "y=[#uvl*50+(ul+ull+utlll)*40+(um+umm+umm"
Attachments:
Formulanode.vi ‏7 KB

you did not define "n" or "d". You can declare them in the formula node code, or even easier, just add outputs with these names.
(What is your obsession with formula nodes, why not use wires instead? This is LabVIEW! )
LabVIEW Champion . Do more with less code and in less time .
Attachments:
Formulanode1MOD.vi ‏7 KB

Formula node: Else if

I want to use a formula node to make my code smaller.
I'm comparing a sensor value and depending on the value i have 3 options.
At the moment i get the error that labview thinks my 'Else if ' is a variabel instead of a command.
am i doing something wrong? another option is to use a Case-structure but this code is allready in a case so i don't know if this could give trouble.
thanks,
Lars
Attachments:
Formula Node Error.png ‏53 KB

Hi James,
when you want to mix datatypes you go with an 1D array of cluster and unbundle instead of the 2nd IndexArray…
Waiting for Christian to post with 1 compare function using a complex number that makes even your look big and a Rube
My own idea:
Just one comparison…
Best regards,
GerdW
CLAD, using 2009SP1 + LV2011SP1 + LV2014SP1 on WinXP+Win7+cRIO
Kudos are welcome

Error 1158 "missing left brace"

the following is my code. as you can infer from it's
simplicity, I am inexperienced.
import flash.events.MouseEvent;
import flash.events.IEventDispatcher;
fatmax.addEventListener(MouseEvent.MOUSE_OVER,extend);
function extend(event:MouseEvent)void:
trace("extended");
the compiler gives the error of: 1158: Syntax error: missing
left brace ({) before the function body.
Yet, as can be clearly seen, there is a left brace.
also, i do not intend for this to be void, but am just trying
to get the button to work right now. When I later want it to play a
motion tween that is on a different layer, how do I do that?

Hi,
import flash.events.MouseEvent;
import flash.events.IEventDispatcher;
fatmax.addEventListener(MouseEvent.MOUSE_OVER,extend);
function extend(event:MouseEvent)
:void
trace("extended");
You can then use the gotoAndPlay / myMovieClip.gotoAndPlay
function.

Problems with bit shift left in Formula Node

Hi,
Sorry but my English is not good.
I'm trying to execute a bit shift left in the Formula Node, but the shift left is not working as I expected.
uInt32 parametro[5];
float32 valorAmostra;
int16 indiceAmostra;
uInt8 indiceResposta;
int16 controle;
int32 valor;
int8 i;
for(i=0; i<5; i++)
parametro[i]=param[i];
valor = parametro[5]<<16 | parametro[4]<<8 | parametro[3];
controle = parametro[1]<<8 | parametro[0];
indiceAmostra = (controle & 0x3FF);
indiceResposta = (controle >> 10);
valorAmostra = valor & 0x7FFFFF;
valorAmostra = valorAmostra*(2.4/8388607);
if((valor & 0x800000) == 0x800000)
valorAmostra = valorAmostra*(-1);
the input param array is of the type uInt8, as I saw in other topics that does not shift with uInt8,
I copy the values of param array to parametro which is of type uInt32, but still did not work.
Testing the input param with the following values:
param[] = {10,14,10,0,16}
the valorAmostra returned is 0,00117188 when he should be 0,300003.
Can someone help me please?
Solved!
Go to Solution.

Portuguese:
Olá,
Existe um bug no LabVIEW para esta operação. Este bug deverá ser corrigido em versões futuras. Uma solução para esta situação é utilizar um int32 ao invés de um ulnt32.
Qualquer dúvida por favor entre em contato.
Obrigado.
English:
I investigated the problem you are having, and it turns out that it is a bug that has already been reported and documented. The work around for it is to use int32 rather than uInt32.
Thanks.
Luciano Borges
R&D Engineer
Pirelli Brazil

Formula node, keep getting errors

I am trying to integrate a formula node into an array, I keep getting errors and don't know why. Any ideas?
Thanks!
Solved!
Go to Solution.
Attachments:
trial7.vi ‏42 KB

That is a better attempt.
The problem is that you only defined your output y array to be a 1-D array. And your math on the input array is also acting like it is a 1-D array.
See the attached modification.
But your formula is simple enough that doing it in real LabVIEW code is easier and you don't have to deal with syntax problems of the formula node.
(Note, since I don't have your data, I couldn't run this, so it is possible there are errors.)
Attachments:
trial7MOD.vi ‏57 KB

Why do I receive Error -23088 when using the Eval Formula Node.vi (LV6.1)?

Hi,
I want to evaluate formulas like x=v>20; with that vi. When typing the
same formula into an normal Formula Node I get the correct answer. When
changing the formula into x=v+20; the eval Formula node.vi works fine.
But whenever I try to resolve a boolean function like that mentioned
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... .vi less powerfull than the normal node?
Thanks for your help,
Daniel

Joel A wrote:
> I think the boolean (binary) ops are the only difference between the two nodes.  I pulled this from the help:
> Formula Node and Expression Node Functions
>
> The following list contains the names of the Formula Node and Expression Node functions, and their descriptions. Except for the binary functions, you also can use these functions with <a href="gmath.chm::/Parser_VIs.html" target="_blank">Formula VIs</a>. All function names must be lowercase. You also can use <a href="mk:@MSITStore:C:\Program%20Files\National%20Instruments\LabVIEW%208.0\help\lvhowto.chm::/Precedence_of_Operators_in.html" target="_blank">operators</a> and the pi constant in Formula and Expression Nodes.
> Start at the help above, and see if you can find any helpful information.
>  
>  
> J
Thanks for help,
I solved the problem by using the "Parse Arithmetic Expression.llb" from
examples. You can modify it and add the operators you need..

Left Brace Error

I've copied this word from word from the book, and it gives
me the error
"1158: Syntax error: missing left brace ({) before the
function body.

I thought it might have been an issue with WHERE I put it,
because when I throw in another left brace, it whines about not
having a right brace to finish out before the program ends. So it
does see the left brace.

PV cell equation error in formula node

Hi! I am currently building a PV system simulation in LabVIEW with maximum power point tracking, and I'm trying to make this VI work using the formula node but I can't run it due to an "array indexing problem". The VI is based on the LabVIEW's toolkit for IV characterization using the equation for the PV cell current. I added the XY graph to graph the current and voltage from the equation. I'm really new to LabVIEW, so any suggestion will be greatly appreciated. I have attached the VI I'm building.
Solved!
Go to Solution.
Attachments:
eqn_based.vi ‏11 KB

Hi spectre,
the formula not cannot calc with arrays the way LabVIEW does:
(Check for correct computation against given formula...)
Best regards,
GerdW
CLAD, using 2009SP1 + LV2011SP1 + LV2014SP1 on WinXP+Win7+cRIO
Kudos are welcome

Formula node calculation error

Hi all,
I am expecting the output of formula node as the value of "c" input variable. but it outputs NaN. I am attaching jpeg file illustrating that.
Clarification would be appreciated.
Kousy
Attachments:
Formula 1.JPG ‏21 KB

Hi Kousy,
look at attached example...
Best regards,
GerdW
CLAD, using 2009SP1 + LV2011SP1 + LV2014SP1 on WinXP+Win7+cRIO
Kudos are welcome
Attachments:
Interpolate_threshold.vi ‏15 KB

Serious bug in LabView 8.5 Formula Node

Hello,
Thought I would warn my fellow LabView programmers about a serious error in the Formula Node:
The problem may be encountered by anyone running a non-us LabView installation:
I am located in Norway, and over here we use the comma (,) as the separator in floating point numbers: So, the use 3.14 is written like 3,14.
The problem is that the Formula Node accepts both formats, but only the US Notation is interpreted correctly !
Example:
float64 x1, x2;
x1 = 3.14;    // Interpreted Correctly !
x2 = 3,14;     // Interpreted as 3: One might say this leads to problems.......
Message Edited by geirove on 06-13-2008 06:23 AM
Geir Ove

geirove wrote:
JoeLabView wrote:
Hi Geir,
It is not a bug.  ............
The node does not recognize localized decimal separators."
Of course it is a Bug: **Any** code that **any** compiler does not recognize, should be flagged with an error message ! I have written my share of compilers myself, and they all flag down code that is not accepted as an error.
Failing to do so may cause serious, expensive and very hard to trace errors.
Sorry, but I would expect that the NI team in their 20. year of LabView development is capable of better than this.
Sorry to disappoint you! It's not a bug since that statement is absolutely valid albeit useless in that context.
The Formula Node since LabVIEW 7 supports C syntax except some advanced features such as pointers. In C the comma in expressions is the sequence operator meaning it separates expressions that will be executed from left to right and the last one will actually be the result of the entire sequence expression. This is often used for the initilizer expression inside the for statement, to initilize several variables to a start value.
And the NI team really is a lot better than you think. The online help may be a bit short about the reasons why the comma is not supported as decimal point but there have been many people thinking about this before it was made like that. It was either C syntax support without localized decimal point or some homegrown syntax with localized decimal point and they went for the first.
Rolf Kalbermatter
Rolf Kalbermatter
CIT Engineering Netherlands
a division of Test & Measurement Solutions

Formula Node error: left brace required ???

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