simple? smath question: get result out of a for loop, variable not defined error 1

[Albert 3D]

Can someone help me with the following:
I'm (obviously) a smath newby, trying to follow the tutorials.

so, what am i doing wrong?
it sais: sum_a is not defined, but everything looks just the same as in the tutorials......

Thanks!

Albert

 

[IRstuff]

You need to have used sum.a in the sheet prior to this, so something like sum.a:=0 would be good, particularly since the sheet has no idea what value sum.a starts at

TTFN (ta ta for now)
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[Albert 3D]

Sorry for my late reply, but thanks a lot!

I didn't see this in the examples but yes that was it.

Best regards,

Albert