Documentation for "Eval Formula"

[LLindenbauer]

Dear all!

I am reading through the documentation surrounding the mathematics library for parsing and evaluating text formulas. In particular I am looking for a grammar and list of avaiable symbols and functions. However, I am unable to find them. Is there a more detailed documentation available somewhere I have not looked? Obviously, the parsers are similar to other formula nodes (https://www.ni.com/docs/en-US/bundle/labview-api-ref/page/vi-lib/gmath/differences-between-the-parse...)

I also do not understand the remark in https://www.ni.com/docs/en-US/bundle/labview-api-ref/page/vi-lib/gmath/parser-llb/parse-formula-stri...

- What should I "Keep [...] in mind for [my] own programming"?

[GerdW · Accepted solution]

Hi LLindenbauer,

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@LLindenbauer wrote:

Obviously, the parsers are similar to other formula nodes (https://www.ni.com/docs/en-US/bundle/labview-api-ref/page/vi-lib/gmath/differences-between-the-parse...)

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The formula parser differs to the formula node as is written in the help:

The parser in the Mathematics VIs supports all elements that Formula Nodes support with the following exceptions: …

The following table lists functions that the parser in the Mathematics VIs supports but Formula Nodes do not. …

So you can read the help for the formula node, but need to keep in mind the differences as listed!

[LLindenbauer]

I see. I was confused since formulas such as

float32 a = 1;

b = a+a;

fail not evaluate, but are valid in Formula Nodes. As I understand it now, the parser is somewhat simpler and accepts what is essentially a single right-hand-side expression.

Thanks for the reassurance.

Best Regards, L.