Replacing row number with value

Hi everyone,

Suppose I have a matrix a:

a = [2 2;1 1;4 1;3 1;4 2];

and matrix b:

b = [3;5;1;5;2;4;2;3;5;1];

Then I want matrix c to be:

c = [4 1;4 2;2 2;4 2;1 1;3 1;1 1;4 1;4 2;2 2]

b is included row number of matrix a and matrix c has replaced each row number in matrix b with value number from matrix a.

Can anyone please help me?

Answer 1

[Jie Yang]

for i=1:length(b)

c(i,:)=a(b(i),:);

end

[Moe]

Thanks.

Answer 2

[Cedric]

A simple way is:

 c = a(b,:) ;

[Moe]

Simple and perfect!