# derivative of scalar

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 December 23, 2010, 18:43 derivative of scalar #1 New Member   Gloria Join Date: Feb 2010 Posts: 16 Rep Power: 8 Hi, All, Merry Christmas and Happy New Year! Please help me to get the expression of derivative of scalar d /dx. Thanks lig

 December 24, 2010, 10:53 #2 New Member   Michael Woopen Join Date: Nov 2010 Location: Aachen, Germany Posts: 12 Rep Power: 8 You mean in terms of numerical means? Ever heard of finite differences? Like: f'(x)=(f(x+h)-f(x))/h or central: f'(x)=(f(x+h)-f(x-h))/2h

 December 25, 2010, 16:06 #3 New Member   Gloria Join Date: Feb 2010 Posts: 16 Rep Power: 8 Thank you akOOma. Seems there is no direct code for the derivative of scalar. I will use this basic method. Happy New Year!

 December 26, 2010, 05:02 #4 New Member   Michael Woopen Join Date: Nov 2010 Location: Aachen, Germany Posts: 12 Rep Power: 8 If you kow the analytical form of the function you may give an exact derivative. Otherwise you have to use numerical approximations.

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