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Re: Removing equal elements from an array [message #49840 is a reply to message #49744]

Wed, 16 August 2006 10:40

JD Smith
Messages: 850
Registered: December 1999

Senior Member

On Wed, 16 Aug 2006 10:12:43 -0600, Jean H. wrote:

> Hi,
>
> just sort your array based on the 2 fields...
> you can do something like:
> maxCol2 = max(a[1,*])
> sortedIndices = sort([a[0,*]*maxCol2 + a[1,*]])
> now do as you did before, but using a[0,sortedIndices] and
> a[1,sortedIndices]

This will only work in general for integer valued coordinates, but
will get you into trouble with floating point. Note the following
degeneracy, for maxCol2=180.:

.1*180 + 1 == .05 * 180 + 10.

thus, e.g., [.1,1] and [.05,10.] would be considered the same
coordinates in your method.

The only possibility for arbitrary floats over some range is to cast
them to integers using a useful precision, and then shifting one set
of numbers clear of the other.

JD

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[Message index]

		Re: Removing equal elements from an array By: JD Smith on Wed, 16 August 2006 10:29
		Re: Removing equal elements from an array By: Julio[1] on Wed, 16 August 2006 09:54
		Re: Removing equal elements from an array By: Jean H. on Wed, 16 August 2006 09:12
		Re: Removing equal elements from an array By: Julio[1] on Wed, 16 August 2006 08:24
		Re: Removing equal elements from an array By: Maarten[1] on Wed, 16 August 2006 05:55
		Re: Removing equal elements from an array By: Julio[1] on Wed, 16 August 2006 05:20
		Re: Removing equal elements from an array By: Mike[2] on Tue, 15 August 2006 15:40
		Re: Removing equal elements from an array By: Jean H. on Tue, 15 August 2006 12:14
		Re: Removing equal elements from an array By: Julio[1] on Tue, 15 August 2006 10:36
		Re: Removing equal elements from an array By: Rick Towler on Tue, 15 August 2006 09:30
		Re: Removing equal elements from an array By: JD Smith on Wed, 16 August 2006 10:40

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