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Re: Why does IDL strip unary dimensions from structure elements? [message #5242 is a reply to message #5240]

Thu, 26 October 1995 00:00

thompson
Messages: 584
Registered: August 1991

Senior Member

Thomas A McGlynn <mcglynn@grossc.gsfc.nasa.gov> writes:

> I've been writing some IDL code which does a lot of generic
> stuff with dyamically defined structures, and I've run into
> a bug/feature that is causing some problems.

Stuff deleted, about the fact that IDL strips off trailing unary
dimensions.

We've also run into this "feature", and it's a big pain. I'm sure it's there
because somebody wanted it somewhere along the line, or thought it was a good
idea.

It appears in many places, not only when working with structures. For example

IDL> a = indgen(3,1,1) & help,a
A INT = Array(3)

or

IDL> a = reform(a,3,1,1) & help,a
A INT = Array(3, 1, 1)
IDL> a = float(a) & help,a
A FLOAT = Array(3)

or

IDL> a = reform(a,3,1,1) & help,a
A FLOAT = Array(3, 1, 1)
IDL> a = a /3 & help,a
A FLOAT = Array(3)

The only way I've come across to get around this problem is to use the SIZE
function to get the original dimensions, and then REFORM to put them back, e.g.

SZ = SIZE(A)
A = A / 3
A = REFORM(A, SZ(1:SZ(0)), /OVERWRITE)

As I said, it's a real pain.

Bill Thompson

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[Message index]

		Why does IDL strip unary dimensions from structure elements? By: Thomas A McGlynn on Thu, 26 October 1995 00:00
		Re: Why does IDL strip unary dimensions from structure elements? By: thompson on Thu, 26 October 1995 00:00

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