On 17-Dec-2008, Daniel J Sebald wrote: | Subject: [OctDev] slow structs | Date: Wed, 17 Dec 2008 18:13:17 -0600 | From: Jonathan Kotta <[email protected]> | To: [email protected] | | I have a problem where a vector within a struct is much slower to | index than a plain vector (~8x slower) . | | x = zeros(1e6,1); | s.x = x; | subset = 500e3:600e3-1; | y = randn(length(subset),1); | for i = 1:5 | tic; x(subset) = y; toc; | end | for i = 1:5 | tic; s.x(subset) = y; toc; | end
Accessing a structure element requires looking up the element in a map using the field name (a character string). You don't expect that would be free, do you? jwe ------------------------------------------------------------------------------ SF.Net email is Sponsored by MIX09, March 18-20, 2009 in Las Vegas, Nevada. The future of the web can't happen without you. Join us at MIX09 to help pave the way to the Next Web now. Learn more and register at http://ad.doubleclick.net/clk;208669438;13503038;i?http://2009.visitmix.com/ _______________________________________________ Octave-dev mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/octave-dev
