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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 verrallr@a[/i] [br]Origin Version v7.5885 (B885) Operating System: I am trying to program Density into OriginC. My OriginC program is : #include <Origin.h> double Density(double T) {return (4956.4/(1.0+3.0*10E-6*(-0.78155+0.1177*T-3.0254E-6*T*T)* (T-298.)));} In my script window, I get this for 400 degrees: bc=Density(400); bc=; BC=0.3535184 However this is wrong. When I give the formula in the Script window for 400 degrees, I get this: dd=(4956.4/(1.0+3.0*10E-6*(-0.78155+0.1177*400-3.0254E-6*400*400)*(400-298.))); dd=; DD=4346.987 That is right. Why won't my Density give me the correct result in the OriginC program. Thank you for your assistance. [/quote]   Check here to include your profile signature. Check here to subscribe to this topic.