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Re: Using two different arrays in tha same calculation [message #2243 is a reply to message #2232]

Wed, 08 June 1994 07:42

dan
Messages: 27
Registered: March 1993

Junior Member

Newsgroup: comp.lang.idl-pvwave:
Subject: Using two different arrays in tha same calculation

ragnar@kvark.fi.uib.no (Ragnar Aas) writes :

> I have the following problem :
>
> I have two different arrays, (8) of float and (300,8) of float.
> I want to vectorize the equation and therefore I need to use both
> arrays in the same equation. For example :
>
> newarray=cos(small_array)*sin(large_array)
>
> where I want the data in small_array to be used over and over 300 times
> in this calculation.
>
> Hope somebody can help me.
>

Ragnar,

You can use the # operator (matrix multiply) to make the small (8)
array into a (300,8) array. Try this :

IDL> arr1 = Findgen(8)
IDL> arr2 = Findgen(300, 8)
IDL> newarr = (Replicate(1.0, 300) # Cos(arr1)) * Sin(arr2)

------------------------------------------------------------ -------------------
Dan Carr
Research Systems
Boulder, Colorado
dan@rsinc.com
------------------------------------------------------------ -------------------

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[Message index]

		Re: Using two different arrays in tha same calculation By: landers on Thu, 16 June 1994 06:52
		Re: Using two different arrays in tha same calculation By: dan on Wed, 08 June 1994 07:42
		Re: Using two different arrays in tha same calculation By: landers on Thu, 09 June 1994 09:09
		Re: Using two different arrays in tha same calculation By: steinhh on Fri, 10 June 1994 00:44
		Re: Using two different arrays in tha same calculation By: thompson on Thu, 09 June 1994 06:20

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