how to find and add a matrix values from another matrix???

I have a matrix A which holds the positions, which further i want to add from matrix B.

for example :

A=[1 2 5]

B=[   0     0     9     0    10
     0     0     9     0    10
     9     9     0     9     9
     0     0     9     0    10
    10    10    10    10     0]

from B's first row i want to add 1st 2nd and [4] 5th elements the answer will be 0+0+10

A matrix represents the position to be added in B

Answer 1

[dpb]

C=sum(B(1,A));

Open the online doc and under "Getting Started" read tutorial info on Array Indexing. I recommend working thru this introductory info in sequence to get going in Matlab quickly...

[suchismita]

thank u so much