p12_17.m

来自「Programs for the book Advanced Engineeri」· M 代码 · 共 13 行

% P12_17.M Approximate the partial derivatives of f(x,y)=x^3*y^3 
%
% partial derivative
df=((1.1)^3-(.9)^3)
%
dfx1=df/.2
% Reduce stepsize
df=((1.01)^3-(.99)^3)
dfx2=df/.02