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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 tini the tiger[/i] [br]Hi. I would like to fit my data with a streched exponential function: y=P1+P2*exp((-x/P3)^P4) but I do not achieve to fit P4. It works only if a set P4 as an integer (1, 2,..). I even do not achieve to simply set my column values with a function like: 2-1*exp((-col(t)/90)^P4) if P4 is not an integer. How can I solve this problem. I#m using ORIGIN 7.0 Thanks in advance tini the tiger [/quote]   Check here to include your profile signature. Check here to subscribe to this topic.