## Matrix multiply with a function

### Indikatop (view profile)

on 22 Oct 2019
Latest activity Commented on by Andrei Bobrov

on 22 Oct 2019

### Andrei Bobrov (view profile)

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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Indikatop

### Indikatop (view profile)

on 22 Oct 2019
It is a 3x3 matrix

on 22 Oct 2019
Why is this flagged as Unclear? It has an accepted answer.
Andrei Bobrov

on 22 Oct 2019
I'm fix :)

### Andrei Bobrov (view profile)

on 22 Oct 2019
Edited by Andrei Bobrov

### Andrei Bobrov (view profile)

on 22 Oct 2019

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

Indikatop

### Indikatop (view profile)

on 22 Oct 2019
Thank you Mr. Andrei for your answer. if d and i in excel or txt format how you do that?
Rik

### Rik (view profile)

on 22 Oct 2019
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.
Andrei Bobrov

### Andrei Bobrov (view profile)

on 22 Oct 2019
@Indikatop: Please attach your txt or xlsx file here and we show how it do.