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Screensize: 640 x 480 800 x 600 1024 x 768 1280 x 1024 UserName: Password: Anti-Spam Code: Format Mode: Basic  Help  Prompt  Format: Font Andale Mono Arial Arial Black Book Antiqua Century Gothic Comic Sans MS Courier New Georgia Impact Lucida Console Script MT Bold Stencil Tahoma Times New Roman Trebuchet MS Verdana   Size 1 2 3 4 5 6   Color Black Red Yellow Pink Green Orange Purple Blue Beige Brown Teal Navy Maroon LimeGreen Message: * HTML is OFF * Forum Code is ON Smilies [quote][i]Originally posted by Martin Helmholtz[/i] [br]Origin Ver.8.0 and Service Release 4 Operating System: WINDOWS XP Hi, i would like to fit the following funktion: y=N+2*sum [(N-k)*cos(k*x*d)*exp(-(d/2pi)^2*x^2*nc*g+ln(pi*k)))*exp(-k^2*x^2*dd^2/2)] and the sum is from k=1 to k=N Therefore wrote a little scrpit in the Fitting Function Organizer using a Y-Script: ***************************************** // Independent Variables x // Dependnet Variables y // Parameters nc, dd double d=64.5; double g=0.5772; double vec=0; int N=100; int k=1; for(k=1;k<=N;k+1){ vec +=(N-k)*cos(k*x*d)*exp(-(d/2/pi)^2*x^2*nc*(g+ln(pi*k)))*exp(-k^2*x^2*dd^2/2); } y=N+2*vec; *************************************************** Now is the calculation very slow, exspecially for large N. Is it possible to write this in a "Origin C" script to make it faster? Regards, Martin [/quote]   Check here to include your profile signature. Check here to subscribe to this topic.