Mathscript natural log issue

[cnisler]

Hello, I am brand new to LabView and programming itself, so sorry if this question is as stupid as I'm assuming it will be. I am trying to write a VI that uses mathscript to output the percent deviation of Stirling's approximation from the actual value of ln(N!) using a factorial sub VI that I have created. I keep getting an error in the mathscript formula with ln, and I have no clue why. If anyone could help me out with this, that would be much appreciated.

[mikeporter]

What it the error?

Mike...

[altenbach]

I think you need log(x) for the natural logarithm. (See also this table, ln(x) is not a recognized function)

(we are also missing your subVI. I am not sure why you even use mathscript for this. Plain LabVIEW primitives would be sufficient.)

[altenbach]

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@altenbach wrote:

Plain LabVIEW primitives would be sufficient.

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Here's a quick draft showing the output of N! (stock LabVIEW) and the Stirling approximation. No Mathscript needed. I am sure you can easily add the percentage deviation calculation.