Does unsigned 32-bit arithmetic work in formula nodes?

I am trying to generate some 32-bit patterns to control my instrument under test. The easiest way to assemble these patterns seems to be to put the bits together in a formula node by shifting and OR'ing. All of my LabView variables are defined to be U32, and the corresponding variables in the formula node are uInt32.
The problem is that whenever I assign a "1" to the most significant bit of a variable, the entire value is coerced to zero. What is happening? what might I be doing wrong? I checked all of the obvious things, such as incorrect data definition, etc. I tried putting together the pattern in various orders, and I narrowed the assignment down to its simplest form. However, I still cannot get a value of 1 into the most significant bit of the U32.
Is there a way around this problem?
Thanks,

Well I seem to have recreated your problem using the formula node (either that or we're both not doing something right).. Look at "out1".
The logical shift function works fine of course.
Message Edited by Bill@NGC on 07-30-2007 08:42 PM
“A child of five could understand this. Send someone to fetch a child of five.”
― Groucho Marx
Attachments:
shift fp.png ‏219 KB
shift bd.png ‏206 KB

Similar Messages

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

Why do in-line conditional expressions work in Formula Node but not in 'Eval Formula Node.vi'?

'Eval Formula Node.vi' and a standard Formula node seem identical in most respects in terms of their functionality, however I'm stumped by the case of inline conditional expressions.
I'd like to read in a string in the syntax "(expr)?(expr)expr)" from a text file and recieve the output as a double.
The subVI seemed like the perfect tool since I was already using it to interpret a number of other calculations within the text file, however in this case the behavior is not as expected.
Has anyone else ever tried this? is there a different syntax needed between the two tools?
Are there other features of the Formula Note not replicated by this VI? (so I can avoid them in future)?
For simplicity I've attached a little demo of the behavior.
I am currently working in 2010, which I know is getting on in years.
If the behavior is improved in later versions, that may be a good excuse to upgrade :-)
Thanks,
Elaine R.
Attachments:
Conditional Formula Node demo.vi ‏13 KB

.aCe. wrote:
Eval formula Node does not do any conditional expressions as far as I am aware.
That is right. It's a rather dirty hacked VI library to do some formula evalution and has many limitations in comparison to the Formula Node including no support for conditional operator as well as some others. In addition it can also error on some more complex bracketed expressions.
It is an old example VI that was never revisited and probably never will be as writing a new one from scratch would be easier. But considering that the Formula Node and Mathscript and other possibilities exist, this is not likely going to happen soon.
Rolf Kalbermatter
CIT Engineering Netherlands
a division of Test & Measurement Solutions

Formula node bitwise OR has a bug?

Hello everyone,
I am trying to do a bitwise OR with 32 bits in an formula node. It seems that the OR operation produces unexpected results if the most significant bit is set. For example if I do:
0x00000000 OR 0xffffffff I would expect 0xffffffff. Instead I get 0x80000000. In binary this looks like:
00000000000000000000000000000000 OR
11111111111111111111111111111111 EQUALS
10000000000000000000000000000000
Please see the attached minimal example for comparison of some example values. The output with using blocks is exactly the one I would expect and is also included in the example.
I am using Labview Version 14.0f1 on Windows 7 Professional.
This might also be in connection with the following currently unresolved bug:
48016
3P7CBB4Q
http://www.ni.com/product-documentation/52150/en/#48016_by_Category
However that that bug is for unsigned int32 and the suggested workaround is to use signed 32 bit integer, which nevertheless fails in the provided example code.
If someone could have a look and tell me if this is a bug or if I am misunderstanding somtheing that would be great. I am already starting to go crazy.
Best regards and thanks in advance
Saali
Attachments:
Minimal_Bug_example.vi ‏10 KB

No, actually this bug is different from what is documented.The documented bug happens with uInt32 and the documentation specifically suggests to use Int32 as a workaround for the known bug:
"2. Use signed 32-bit integers instead of unsigned 32-bit integers in the formula node."
However this is exactly what fails in my case when I use OR. I thought this might be some valuable information for the people trying to fix that bug. (Which seems to be hard to find, as it has been around so long and screws up very basic operations.)
It might also be that NI does not really care for that bug because most people don't use the formula node for basic bit arithmetic. Anyway, I just wanted to put the information out somewhere for the next person who has that problem to find. I guess the lesson I learned from this conversation is don't trust the formual node to much for doing low-level bit stuff...
Best regards
Saali

Bit Complement in an Expression Node

I can use bit complement in a formula node but not the expression node. The
"~" tilde is the only text in the expression node. The error is "~#" with
# being the error. The input is a U8. Thanks in advance for any help.

Hi Catherine,
I've tried your suggestion earlier and tried it again after your
post but it still doesn't work. I am new to expression nodes so maybe my
syntax is incorrect. To do the same in C language I think it looks like
this: "a = ~ b;". I made a picture and a copy of the error. Let me know
if you see anything wrong. Thanks!
Error on line 1 is marked by a '#' character: "~#"
[Image]
Pat S.
cfpautx wrote:
> Hello Pat,
> The way to fix this problem is fairly simple, if you change your
> inputs and outputs to I8, u16 or I16 it will run correctly.
> Regards,
> Catherine Petronino
> National Instrument
> www.ni.com/ask

Formula node: type conversion

Hello guys
I have LV 5.0 and have to edit a script which has some kind of overflows. For testing I set all variables to the hightest usable range - extended or i32. Now I see, in all formula nodes, there are type conversions. How can I change the type of the inputs/outputs of the formula node?
Hardware_Tester
My first language is German, please ignore my faults...

Hi,
I forgot that you run Lv5.0. My example refers to Lv7.1.
As far as I know in Lv7.1 the input variable type changes automatically as you connect a control.
On the contrary the output is DBL by default but you can change it in the formula node introducing an explicit declaration of that variable (see "h" in the attached picture).
Here are some useful link:
http://forums.ni.com/ni/board/message?board.id=170&message.id=12253&requireLogin=False
http://digital.ni.com/public.nsf/3efedde4322fef19862567740067f3cc/d6bed7d73659c43586256a7300691c26?
Sorry, I understand that this cannot solve your problem but I don't remember how Lv5.0 works with formula node.
Regards
CLD - Labview Certified Developer
Attachments:
untitled3.gif ‏42 KB

TS4062 hi can somebody help me... itunes does not accept the iphone 4s but i already have the version 64 bit to work with windows 7 64 bit, the computer recognizes the phone but itunes sais i need 64 bit itunes.... please is there something im missing...

hi can somebody help me... itunes does not accept the iphone 4s but i already have the version 64 bit to work with windows 7 64 bit, the computer recognizes the phone but itunes sais i need 64 bit itunes. please is there something im missing... thanks

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Download and save a copy of the iTunesSetup.exe (or iTunes64setup.exe) installer file to your hard drive:
http://www.apple.com/itunes/download/
Download and install the free trial version of WinRAR:
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How exactly does the logical shift function work?

I think I am missing something very basic here - I am trying to left shift an 8 bit unsigned integer by one place (x<<1)in each iteration of a while loop. So if I start with a number, say 18, the first iteration I get 36, then 72, 144 and after this 32, 64 and so on. I'm not able to do this apparently simple operation in LabVIEW. I tried the logical shift function and a formula node, but both dont give me what I need. The formula node appears to be close in that it gives me 18,36,72,144 but after that I get 255 rather than 32. I dont understand what the logical shift function is doing here. I have attached a vi here that shows what I am trying to do. Any help explaining the mistake I am making will be greatly apprec
iated.
Thanks.
Attachments:
Logical_Shift.vi ‏17 KB

You have the inputs confused. If you want to left-shift by 1 at each iteration, the "1" goes on the upper "y" terminal and the number from the shift register (the "shiftee") goes at the bottom. (see attached modification).
LabVIEW Champion . Do more with less code and in less time .
Attachments:
Logical_Shift_2.vi ‏27 KB

"Eval Parsed Formula Node VI" does not return outputs in predefined order

I make a data analysis program, where the data consists of some million events and each event has e.g. 4 channels and 1-5 hits on each channel.
I would like the user to select different expressions of these channels to give coordinates to plot in a 2D histogram (increment a bin in Intensity Graph), e.g. for some experiment you want to show x=ch1-ch2; y=ch1+ch2+ch3+ch4; while in another experiment you want x=ch1-123; y=123-ch2;
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Besides this issue, it also seems very strange there is virtually no support for conditional expressions or operators in Formula Node evaulated formulas (called Mathematics VIs in the documentation). Maybe using (1+sign(a-b))/2 you can build something that is 0 when a<b and 1 when a>b, but it is not user friendly! Would it really be diffcult to add a function like iif(condition, return_value_if_true, return_value_if_false) to replace the unsupported "condition ? if_true : if_false" operator? Would it really be difficult to add support for the < <= >= > == || && operators? Although compiled to an assemply language, this can't exactly be difficult for a CPU.
Attachments:
LV script test.png ‏62 KB
LV script test.vi ‏18 KB

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LabVIEW Champion . Do more with less code and in less time .

Two part question 1) what happens if you sign into messages beta on os x lion 10.7.5 after it expired? does the whole application not work or just imessage? 2) does installing messages beta on os x lion 10.7.5 delete ichat?

Two part question
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Hi,
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8:51 PM Sunday; May 5, 2013
 iMac 2.5Ghz 5i 2011 (Mountain Lion 10.8.3)
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 MacBookPro 2Gb (Snow Leopard 10.6.8)
 Mac OS X (10.6.8),
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Does anyone have URL replacement working for catalog generated from wiki pages library

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Rendered cc/_banner_link.html.erb (0.2ms)
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Does unsigned 32-bit arithmetic work in formula nodes?

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