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Re: my array is too long for PCOMP?! [message #38808 is a reply to message #38764]

Thu, 25 March 2004 07:07

James Kuyper
Messages: 425
Registered: March 2000

Senior Member

Thomas Nehls wrote:
>
> Hi,
>
> I want to compute the principal components of an array with 3 colums and
> around 56000 rows. All I get is "% Array has too many elements."

I tried the following:

seed = 12345L
data = randomn(seed,3,56000)
result = pcomp(data,coefficients=coef,eigenvalues=eigen)

There were no such problems. Are you sure you've got 3 columns and 56000
rows? If it's the other way around, pcomp() has lots of problems, since
it needs to create a 56000x56000 array internally. In IDL, like Fortran,
the number of columns is the length of the first dimension, unlike C,
where it's the last dimension. As a result, this is an easy mistake for
C programmers to make.

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[Message index]

		my array is too long for PCOMP?! By: Thomas Nehls on Thu, 25 March 2004 03:01
		Re: my array is too long for PCOMP?! By: James Kuyper on Thu, 25 March 2004 07:07

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