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Applying scalar functions to arrays [message #10437]

Thu, 04 December 1997 00:00

vaever
Messages: 3
Registered: November 1997

Junior Member

How can you apply an IDL scalar function to each element in an
array, without using for loops?

Suppose we have the following array:

IDL> a=[0.05,0.01,0.001]

Calculating cosine is easy!
IDL> print,cos(a)
0.998750 0.999950 1.00000

But how about chi-square quantiles...?
IDL> print,chisqr_cvf(a,17)
% Compiled module: CHISQR_CVF.
% Expression must be a scalar in this context: <BYTE Array[3]>.
% Error occurred at: CHISQR_CVF 49
/usr/local/rsi/idl_5/lib/chisqr_cvf.pro
% $MAIN$
% Execution halted at: $MAIN$

The manual instructs you to avoid for loops when operating on
arrays, but doesn't tell you how! Can anyone help?

Niels

--
Niels Vaever Petersen tlf.: 8942 3494
Afd. f. Teoretisk Statistik e-mail: vaever@mi.aau.dk
Aarhus Universitet kontor: G3.19

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[Message index]

		Applying scalar functions to arrays By: vaever on Thu, 04 December 1997 00:00
		Re: Applying scalar functions to arrays By: Martin Schultz on Fri, 05 December 1997 00:00

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