Lua and user defined functions

[Bert Wikkerink]

Hi,

I was in Chicago too and had a great time!
Learned a lot about lua and other things, but ...

Is there a way to call a user defined function (created in TI-Nspire) in a lua script?

Bert Wikkerink

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[Adriweb]

Hi !

What you are looking for is the math.eval() function

On OS < 3.2, it's just math.eval("your math expression here") and it will return a string with the result.

On OS >= 3.2, this commands still exists but will return a number with the result. To have a string, just do math.evalStr("expression")

For your example, just type your basic's function name etc...

You can find some more info here : http://wiki.inspired-lua.org/math.eval

And probably some tutorials about it on inspired-lua.org or Steve Arnold's website here (http://www.compasstech.com.au/TNS_Authoring/Scripting/script_tut16.html).

What the official doc says about it (3.1) : 

math.eval(math_expression)

This function sends an expression or command to the Nspire math server for evaluation.

The input expression must be a string that the Nspire math server can interpret and

evaluate.

If the math server successfully evaluates the expression, it returns the numerical results.

The eval function returns no result if the math server does not return a calculated result

or if the calculated result cannot be represented as a fundamental Lua data type.

If the math server cannot evaluate the expression because of a syntax, simplification, or

semantic error, eval returns two results: nil and an error number.

 

Have fun !

[Adriweb]

Also, just a little addition : 

on < 3.2, math.eval() returns directly the right type of variable (number if the result if number, 1d table if list, etc.)

On 3.2 with platform.apilevel = "1.0", it forces the output type as string...

[Andy Kemp]

It's also worth noting that you can use the math.eval() function to make use of any of the built-in routines on the Nspire including the CAS engine if you are using a CAS device...

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[Levak]

Note that you can't use programs (Prgm:EndPrgm) or built-in graphical routines (Text, Request ...) with math.eval()

On Sunday, 11 March 2012 19:40:07 UTC+2, Andy Kemp wrote:

It's also worth noting that you can use the math.eval() function to make use of any of the built-in routines on the Nspire including the CAS engine if you are using a CAS device...

On Sun, Mar 11, 2012 at 3:44 PM, Adriweb <bertran...@gmail.com> wrote:

Also, just a little addition : 

on < 3.2, math.eval() returns directly the right type of variable (number if the result if number, 1d table if list, etc.)

On 3.2 with platform.apilevel = "1.0", it forces the output type as string...

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[Eric Findlay]

Hmm...yet another great reason to design function properly instead of relying on input boxes.  ;)

  --Eric

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