Finding an element of a cell in a cell array

If I have a cell array:

C= [ [1 2 3], [2 2 3], [5 2 7 10 2 1], [12 10 22 0] ,[4 7 5] ]

I want to locate all of the 1's ( so C{1}(1), and C{3}(6) ), and replace them with two random numbers. How might I go about doing that?

Answer 1

[Cedric]

A simple loop would do

 C = { [1 2 3], [2 2 3], [5 2 7 10 2 1], [12 10 22 0] ,[4 7 5] } ;

 for cId = 1 : numel( C )
     is1 = C{cId} == 1 ;
     if any( is1 )
         C{cId}(is1) = rand( 1, nnz(is1) ) ;
     end
 end

outputs C with..

 >> C{1}
 ans =
    0.6324    2.0000    3.0000

 >> C{2}
 ans =
     2     2     3

 >> C{3}
 ans =
    5.0000    2.0000    7.0000   10.0000    2.0000    0.0975

If you need a random integer -> doc randi