Execute a function stored in text format

[Athena_4537]

Hello,

In an Excel sheet, I would like to introduce a function (in text format) which will then be retrieved to be applied to various cells, but with the contents of a cell (which will vary dynamically) via the LET function.

For example: Function: x+x^(1/2) or sin(x+1) or 2x^3-3x^2+5*x-3 LET formula obtained by concatenation: LET(x, B40, x+x^(1/2)) or LET(x, B40, sin(x+1)) And then, to execute this function in different places, with B40 which will vary depending on the cell where LET is created: LET(x, C40, x+x^(1/2)) then LET(x, D40, x+x^(1/2))

But how to execute and calculate this function stored in text format?

The function =LET(x, B40, x+x^(1/2)) used directly in a cell gives a result, but if the function (here x+x^(1/2)) changes, all the LETs need to be rewritten...
While a dynamic composition allows you to have the right LET everywhere, but... how to execute it afterwards.

The VBA function gives me errors 2015.

I am open to any solution, even in VBA.

Thank you in advance for your help.

 

[rlv01]

If there are just a few functions that you need to select between, why not just build them into the LET statement?

=LET(condition,A1,x,B1,IF(condition=1,x+x^(1/2),IF(condition=2,SIN(x+1),IF(condition=3,2*x^3-3*x^2+5*x-3))))

 

[Anthony47]

Another option, using a UDF:
Assuming that you calculate a well formed string:
1) insert in a standard module of your vba project the following code

Function EvalString(ByVal myStr As String) As Variant
EvalString = Evaluate(myStr)
End Function

2) as last entry in your LET formula insert EvalString(TheString)

 

[Fluff]

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Cross posted at: Execute a function stored in text format
and Execute a function stored in text format
and Execute a function stored in text format
and Executer une fonction stockée au format texte
and Executer une fonction stockée au format texte - Macros et VBA Excel

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