p10_16.m

Advanced Engineering Mathematics using MATLAB by Harman, Dabney, Richert,书中全部源码

% P10_16.M Approximate the partial derivatives of f(x,y)=x^3*y^3 
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% partial derivative
df=((1.1)^3-(.9)^3)
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dfx1=df/.2
% Reduce stepsize
df=((1.01)^3-(.99)^3)
dfx2=df/.02