MATLAB: Short code to calculate and display value of matrix based on condition

Question

Hi. I want to calculate new value in matrix C and based on conditions from value of matrix P. I want to display values cell string D in new cell string E based on chosen values of matrix P.

P =

    1.0000    0.8181    0.9960    0.0000
    0.8181    1.0000    0.5233    0.0000
    0.9960    0.5233    1.0000    0.0000
    0.0000    0.0000    0.0000    1.0000

D =

    'A'
    'B'
    'C'
    'D'

I want to calculate C and display E like this,

-1- if any value of P is less than 0.05, it will become 1, else it will become 0 in C.

-2- Then, sum values of C by each row. For example, row 1, 2, 3 will become 1, row 4 will become 3. After that, I would like to divide total of each row by number of all C columns, which is 4.

C =

    0.25
    0.25
    0.25
    0.75

-4- Display E cell string with value from D cell string by matching same column number of P values which is less than 0.05 with row number of D values. It will become like this.

E =

       'D'
       'D'
       'D'
       'A','B','C'

Answer 1

First part can be achieved by this:

P = [ 1.0000    0.8181    0.9960    0.0000
    0.8181    1.0000    0.5233    0.0000
    0.9960    0.5233    1.0000    0.0000
    0.0000    0.0000    0.0000    1.0000];
A = zeros(size(P)) ;
A(P<0.05) = 1 ;

second part is not clear.