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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 AdamCrain[/i] [br]I am trying to make a user defined quadratic equation for protein ligand binding. The compile always fails for some unknown reason. Here is the equation, parameters, and test data. Please can anyone help me? y = Vmax * (((Et + x + KD) - sqrt((Et + x + KD)^2 - 4*Et*x))/(2*Et) Parameters: Vmax = 1.1 KD = 0.000003 Et = 0.00003 Et is a constant and can be fixed. KD is known from another technique so it should be very close. Vmax is an approximation and could be off a little. Test data: x space y 0.00006 space 1 0.00003 space 0.84 0.0000225 space 0.7 0.000015 space 0.54 0.0000075 space 0.29 0 space 0 Thank you, Adam [/quote]   Check here to include your profile signature. Check here to subscribe to this topic.