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Array slices [message #47250]

Thu, 02 February 2006 08:44

Richard Edgar
Messages: 8
Registered: February 2006

Junior Member

Greetings,

I'm having trouble with slices of 3D arrays in IDL, and I suspect that
it's something I don't understand about the way IDL interprets things.
My problem can be summed up as follows:

IDL> arr=DINDGEN(3,3,3)
IDL> help,arr
ARR DOUBLE = Array[3, 3, 3]
IDL> help,arr[*,*,1]
<Expression> DOUBLE = Array[3, 3]
IDL> help,arr[*,1,*]
<Expression> DOUBLE = Array[3, 1, 3]
IDL> help,arr[1,*,*]
<Expression> DOUBLE = Array[1, 3, 3]

My questions are:
a) Why don't all three slices return a [3,3] array?
b) How do I eliminate the 'useless' dimension?

I typically have routines which want a 2D array, which I only get from
the first of these. They (naturally) choke when given a 3D array, one of
whose dimensions is unity.

Thanks in advance,

Richard

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[Message index]

		Array slices By: Richard Edgar on Thu, 02 February 2006 08:44
		Re: Array slices By: David Fanning on Thu, 02 February 2006 10:11
		Re: Array slices By: Craig Markwardt on Sun, 05 February 2006 10:44
		Re: Array slices By: David Fanning on Thu, 02 February 2006 10:01

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