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Finding values in an array [message #25476]

Sun, 24 June 2001 21:26

Bob Fugate
Messages: 18
Registered: March 2001

Junior Member

I have a vector containing a very, very large number of long integer values.

I want to compare the value of each element in the vector to the values of
the elements in the first column of a two column array until there is a
match, and then extract the corresponding number in the second column (e.g.
by using WHERE) of the array.

Does anyone know a way to do this without using a loop? I realise that
organizing the searched array as two rows may speed this up, however, I am
trying to avoid using a loop. The numbers in the vector vary randomly (and
it is important to preserve the original order) but the numbers in the first
column of the array are sorted and increase monotonically (if that matters).

I am new to IDL, so will greatly appreciate any suggestions.

Bob Fugate

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[Message index]

		Finding values in an array By: Bob Fugate on Sun, 24 June 2001 21:26
		Re: Finding values in an array By: david[2] on Mon, 25 June 2001 20:59
		Re: Finding values in an array By: Craig Markwardt on Mon, 25 June 2001 20:26
		Re: Finding values in an array By: david[2] on Mon, 25 June 2001 19:28
		Re: Finding values in an array By: Bob Fugate on Mon, 25 June 2001 18:50
		Re: Finding values in an array By: Craig Markwardt on Sun, 24 June 2001 23:18

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