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Huh?? Stddev went crazy! [message #59858]

Wed, 16 April 2008 12:07

Conor
Messages: 138
Registered: February 2007

Senior Member

I'd like to see someone explain this one. My stddev function
apparently lost all grasp on reality?

IDL> print,stddev([1,2,3,4,5])
3.07421 3.24566 3.08206 3.26360 2.97446
IDL> print,stddev([1.,2.,3.,4.,5.])
3.07421 3.24566 3.08206 3.26360 2.97446
IDL> print,stddev([1.,2.])
3.07421 3.24566

IDL> print,stddev(findgen(32))
2.99513 3.07421 3.24566 3.08206 3.26360
2.97446 2.96850 3.04474 2.66875 2.77181
2.83465
2.77395 2.77370 2.87829 2.84716 2.86982
2.98503 2.93160 2.77602 2.59318 2.83169
3.30869
2.67353 3.15337 3.19076 3.19499 2.96050
3.13871 2.61707 2.77854 3.12603 3.20029

Finally I did this:

IDL> .reset

And it returned to normal! Yeah!

IDL> print,stddev(findgen(32))
% Compiled module: STDDEV.
% Compiled module: MOMENT.
9.38083
IDL> res = findgen(10,10)
IDL> print,stddev(res)
29.0115

I have not been able to reproduce the crazy behavior since (not that
I've tried very hard). Still, it's rather worrisome if the behavior
of a built in function isn't reliable!!

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Huh?? Stddev went crazy!

By: Conor on Wed, 16 April 2008 12:07

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