how do I substitute all negative values in a vector with a random number between 0 and 2

How do I substitute all negative values in a vector (called y) with a random number between 0 and 2?

Answer 1

[per isakson]

One way

>> Y = randi( [-4,4], 1,12 );     % sample vector
>> isneg = Y < 0;
>> Y( isneg ) = 2*rand( 1, sum(isneg) )
Y =   Columns 1 through 10             
           2      0.69135            0            2            0      0.72759       1.7308            2            0            3   
      Columns 11 through 12             
           1            0 

Answer 2

[Stephan]

y(y<0) = 2*rand(1,numel(y(y<0)))

Answer 3

[Shounak Shastri]

The simplest (but not the most efficient) way to do this would be to inititalize a for loop and run through all the elements one-by-one.

for ii = 1:length(y)
    if y(ii) < 0
        y(ii) = randi([0, 2]);
    end
end

The function randi() generates a random number bertween the limits given in the square brackets, in this case 0 and 2.

A better (faster and more efficient in terms of lines of code) way to do this would be

y (y < 0) = randi([0, 2]);