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Re: "clamping" an array to a maximum value? [message #13941 is a reply to message #13934]

Tue, 22 December 1998 00:00

Craig Markwardt
Messages: 1869
Registered: November 1996

Senior Member

Martin Schultz <mgs@io.harvard.edu> writes:
> Yup,
>
> that's what I really intended to say/write. BTW: How about a "last
> element" operator? I very often need something like
> subdata = data[*,0:n_elements(data[0,*])-1]
> which is not very aesthetic ;-) is it? It would just be great if one
> could write something like
> subdata = data[*,0:(*)-1] or anything with a similar short syntax
> In this case the parantheses would serve to distinguish between "all
> elements" and "last element". That's probably a little dangerous. Anyone
> with a better idea?

Yes, yes, a billion times yes! A billion is about the number of times
I could have used this capability.

Some present-day scripting languages allow you to supply negative
subscripts, to indicate indexing from the end rather than the front of
the array. data[-1] would indicate the last element, data[-2] the
second to last, etc. Powerful, but maybe *too* powerful.

Craig

--
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Craig B. Markwardt, Ph.D. EMAIL: craigmnet@astrog.physics.wisc.edu
Astrophysics, IDL, Finance, Derivatives | Remove "net" for better response
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[Message index]

		Re: "clamping" an array to a maximum value? By: Kevin Ivory on Wed, 23 December 1998 00:00
		Re: "clamping" an array to a maximum value? By: Craig Markwardt on Tue, 22 December 1998 00:00
		Re: "clamping" an array to a maximum value? By: Martin Schultz on Tue, 22 December 1998 00:00
		Re: "clamping" an array to a maximum value? By: davidf on Mon, 21 December 1998 00:00
		Re: "clamping" an array to a maximum value? By: Kevin Ivory on Mon, 21 December 1998 00:00
		Re: "clamping" an array to a maximum value? By: Martin Schultz on Mon, 21 December 1998 00:00
		Re: "clamping" an array to a maximum value? By: Kevin Ivory on Mon, 21 December 1998 00:00
		Re: "clamping" an array to a maximum value? By: Mark Buckley on Mon, 21 December 1998 00:00

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