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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 kpisane[/i] [br]Origin Ver. and Service Release (Select Help-->About Origin): 9 Operating System: Windows 7 Hello, I am having trouble with a fitting function I have been trying to write for my data analysis: I have a plot of x and y=f(x) that I need to fit, but there is a catch: y=f(x)=Integral[g(x,z)] where I integrate the function from z=0 through infinity so that the result only depends directly on x. The integral cannot be solved analytically which is where my problem comes in. I can perform the integral using d01smc from the NAG library for a constant value of x, but my result plots as a function of z. Alternatively, I am able to get a function that will simulate the result as a function of x and z (3D plot), but this function cannot be used for fitting to my data. Is there a way to integrate over z and plot/fit against x? [/quote]   Check here to include your profile signature. Check here to subscribe to this topic.