comp.lang.idl-pvwave archive: archive » Re: row calculation in a 2D array

Home » Public Forums » archive » Re: row calculation in a 2D array

Show: Today's Messages :: Show Polls :: Message Navigator
E-mail to friend

Re: row calculation in a 2D array [message #12601 is a reply to message #12591]

Tue, 25 August 1998 00:00

David Kastrup
Messages: 33
Registered: February 1998

Member

"Jonas" <jonas_2@hotmail.com> writes:

> Probably a damn simple one, but anyway:
>
> I want to perform the same operation on each sub-row in a 2D array.
> Say I want to calculate the mean of element 4-7 in each row of a 10x10
> array, and store the result in a 10 element-vector, where each element holds
> the mean from the respective row
>
> how is this done the smartest way, without using time-consuming loops?

mean = total(array[4:7,*],1)/4

--
David Kastrup Phone: +49-234-700-5570
Email: dak@neuroinformatik.ruhr-uni-bochum.de Fax: +49-234-709-4209
Institut fï¿½r Neuroinformatik, Universitï¿½tsstr. 150, 44780 Bochum, Germany

Report message to a moderator

[Message index]

		Re: row calculation in a 2D array By: Alex Schuster on Wed, 26 August 1998 00:00
		Re: row calculation in a 2D array By: Jonas on Wed, 26 August 1998 00:00
		Re: row calculation in a 2D array By: Martin Schultz on Tue, 25 August 1998 00:00
		Re: row calculation in a 2D array By: Jonas on Tue, 25 August 1998 00:00
		Re: row calculation in a 2D array By: Kevin Ivory on Tue, 25 August 1998 00:00
		Re: row calculation in a 2D array By: David Kastrup on Tue, 25 August 1998 00:00

Previous Topic:	What is going on with the minor ticks on log plots?????
Next Topic:	Boundary Chain Code

-=] Back to Top [=-

[ Syndicate this forum (XML) ] [

] [

]

Current Time: Tue Oct 21 16:05:02 PDT 2025

Total time taken to generate the page: 1.36332 seconds