All Forums  Origin Forum  Origin Forum  Integral fitting problem

Note: You must be registered in order to post a reply.
To register, click here. Registration is FREE!

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 mccx[/i] [br]Origin Ver.8 and SR 4 (Select Help-->About Origin): Operating System:Vista I have generated the following function, for integral equation fitting double dIntegral = 0.0; double dInt = 0.0; double t = 0.0; double dPrecision = 1e-6; double dt = 0.05; //the following lines actually perform a integrate to the function, the trapezoidal rule is used. do { dInt = ((frac*N*Ms*pi)/6)*((1/(tanh((Ms*pi*(t^3)*x)/(6*1.38e-23*temp))))-(((6*1.38e-23*temp)/Ms*pi*(t^3)*x)))*(((y^2)*exp((-((ln(y/y0))^2)/(2*s^2)))))*dt; dIntegral += dInt; } while ( dInt / dIntegral > dPrecision ); y= dIntegral // End of editable part } [img]/ftp/forum_and_kbase/Images/intesitbbligi.gif[/img] [img]/ftp/forum_and_kbase/Images/rrggrr.gif[/img] I compiled it without errors However, when I start fitting my data, all parameters are always zero. What to do? [/quote]   Check here to include your profile signature. Check here to subscribe to this topic.