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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 Labog[/i] [br]Origin Ver. and Service Release (Select Help-->About Origin): Operating System: Hi I would like to fit some measured magnetisation data using an integral of the Langevin formula multiplied by log normal. I am new to writing functions to fit, so I wanted to try by just re-writing the Langevin formula but I can't even get this to work! I want to use something of the form M = Ms*((cosh(A*r*H)/sinh(A*r*H))-1/A*r*H) where H is the dependent variable and r is varied to give the best fit to the data. I have defined Ms=4.8E5, A=6.1E20, r = 9e(-9). When I try to evaluate this in the function builder it doesn't give me a value, and when fitting it does not produce a fit that converges. Please help! [/quote]   Check here to include your profile signature. Check here to subscribe to this topic.