element values of matrix.

Lets say i have matrix A=[1 2 2;1 2 2;2 1 2;2 2 2]. if i do this code:

[m,n]=size(A) 
for j = 1
    for i = 1:m
        if(ACM(i,j)==1)
C=(i,j)
end
end
end

%this program gives me the position of elements whose value is equal to 1. And there are 2 rows from 1st columns values are is 2. so i want that the rows whose elemnt is 1 need to be equal to "20", and the rest rows whose element is 2 , need to be "3". And multiply them according to sequence. in this case C will be resulted C=(1,1) C=(2,1), these are together represents "20", and with rest 3rd and 4th rows are 2s. which represent "3" . So result i want this 20*3*3=180. i hope i could explain :)

Answer 1

[Star Strider]

I am not certain I understand what you want, but this seems to come close:

A=[1 2 2;1 2 2;2 1 2;2 2 2];

C = A;
C(C==1) = 20;       % Use ‘logical indexing’
C(C==2) = 3;

C = prod(C,2)       % Take product along rows, across columns

produces:

C =

     180.0000
     180.0000
     180.0000
      27.0000

[Akmyrat]

not exactly what i want...but anyway thanks a lot .

[Star Strider]

My pleasure!

If it’s not exactly what you want,

• what does it do that you don’t want it to do, or
• what doesn’t it do that you want it to do?