matlab function

Question

LIU WEIHUA 2012-3-26

0
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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/33539-matlab-function

First I write a function as follow:

syms x y z
f = [x*y*z; y; x + z];
v = [x, y, z];        
R = jacobian(f, v);
As just you said, to get the value of R at the particular value of x,y,z, I can use 
subs(R,[x,y,z],{1,2,3});
However, if z is a vector, and I want to compute the each value of R by using each element of z and the value of x,y, hence, I made a loop as follow:
%Consider x=1;y=2;z=[1 2 3];
for i = 1:size(z)
t = z(i);
R(:,:,i)=subs(R,[x,y,z],{1,2,t});
end
however, it doesn't work, because t can not be instead by each value in vector z, what shall I do on this?
Thank you very much!

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Oleg Komarov 2012-3-26

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Answer 1

Andrei Bobrov 2012-3-27

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https://ww2.mathworks.cn/matlabcentral/answers/33539-matlab-function#answer_42190

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syms x y z
f = [x*y*z; y; x + z];
v = [x, y, z];
R = jacobian(f, v);
t = 1:3;
Out = zeros([size(R),numel(t)]);
for j1 = 1:numel(t)
    Out(:,:,j1) = subs(R,[x y z],[1 2 t(j1)]);
end