comp.lang.idl-pvwave archive: archive » Re: Code optimization

Home » Public Forums » archive » Re: Code optimization

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

Re: Code optimization [message #75142 is a reply to message #75141]

Wed, 16 February 2011 12:57

Jeremy Bailin
Messages: 618
Registered: April 2008

Senior Member

Are cov, cs and var_factor functions or variables? If variables, it would be a lot clearer to subscript them with [] instead of (). (also, why start those for loops at 1 and have -1 scattered throughout the code? it would be clearer to loop from 0 to num-1 or m-1 respectively and just index with i, j and k)

Assuming they're variables:

; calculate the matrix sum
sum = matrix_multiply(matrix_multiply(cov, cs), cs, /atranspose)
; pick out the diagonals, which are the ones with the same i in both cs multiplications
diags = (num+1) * lindgen(num)
; multiply by var_factor
var_alpha = sum[diags] * var_factor

-Jeremy.

Report message to a moderator

[Message index]

		Re: Code optimization By: Jeremy Bailin on Thu, 17 February 2011 11:52
		Re: Code optimization By: kisCA on Thu, 17 February 2011 11:42
		Re: Code optimization By: Fabzou on Thu, 17 February 2011 01:14
		Re: Code optimization By: Jeremy Bailin on Wed, 16 February 2011 13:48
		Re: Code optimization By: kisCA on Wed, 16 February 2011 13:25
		Re: Code optimization By: kisCA on Wed, 16 February 2011 13:23
		Re: Code optimization By: Jeremy Bailin on Wed, 16 February 2011 12:57
		Re: Code optimization By: pgrigis on Wed, 16 February 2011 12:51
		Re: Code optimization By: Kenneth P. Bowman on Thu, 17 February 2011 12:52
		Re: Code optimization By: pgrigis on Thu, 17 February 2011 12:09

Previous Topic:	Resizeable Graphics Windows for Traditional Commands
Next Topic:	make strsplit not skip null between patterns

-=] Back to Top [=-

[ Syndicate this forum (XML) ] [

] [

]

Current Time: Fri Oct 10 13:42:19 PDT 2025

Total time taken to generate the page: 0.80303 seconds