Matrix multiply with a function

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Indikatop 2019-10-22

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https://ww2.mathworks.cn/matlabcentral/answers/486713-matrix-multiply-with-a-function

评论： Andrei Bobrov 2019-10-22

i have two matrix with same columns and rows(matrix a and b). a is depth and b is land use index. each index value has a different equation and it is function of depth. i need to create a third matrix by substituting depth value to the functions.

depth d={2 3 4;7 2 5;1 2 5}

land use l={a b c;b c a;c b a}

a=0.5*depth+3

b=0.78*depth+4

c=0.1*depth+8

I really appreciate your cooperation. Thank you

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Adam 2019-10-22

Why is this flagged as Unclear? It has an accepted answer.

Andrei Bobrov 2019-10-22

I'm fix :)

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采纳的回答

Andrei Bobrov 2019-10-22

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https://ww2.mathworks.cn/matlabcentral/answers/486713-matrix-multiply-with-a-function#answer_397602

编辑：Andrei Bobrov 2019-10-22

i = [1:3;2,3,1;3:-1:1];
k = [.5;.78;.1];
f = [3;4;8];
d=[2 3 4;7 2 5;1 2 5];
l = k(i).*d + f(i);

l = kron(k(i),d) + kron(ones(size(i)),f(i));

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Rik 2019-10-22

Then you need to load them as variables. I'm sure Google will be able to supply you with dozens if not hundreds of examples of how to read data from Excel to Matlab.