How do I pick selected values in a matrix

I have generated the following matrix:

A =

0 0 0 0 0 2 2 2 0 0 2

0 2 0 2 0 0 0 0 0 2 0

2 2 0 2 2 0 0 2 2 2 2

2 2 0 0 0 2 2 0 2 0 2

2 2 2 0 0 2 2 0 2 0 0

2 2 2 0 2 0 0 2 2 2 0

2 2 2 2 2 2 2 2 2 2 0

2 2 2 0 2 2 2 2 0 2 2

2 0 2 0 2 2 2 2 2 0 0

2 2 2 2 2 2 2 2 0 2 2

How do I only select the zero values in the matrix?

[the cyclist]

When you say, "only select the zero values", can you be specific about what you want the output to be? Don't just rephrase it as something like, "I only want the zeros". Say exactly what the output should be.

[NAA]

I want to:

1. select the zero values in the matrix
2. divide the number of zero values by the number of elements in the matrix which I will use in a plot

Answer 1

[the cyclist]

You want the fraction of zeros in the array?

A = ...
     [0     0     0     0     0     2     2     2     0     0     2
     0     2     0     2     0     0     0     0     0     2     0
     2     2     0     2     2     0     0     2     2     2     2
     2     2     0     0     0     2     2     0     2     0     2
     2     2     2     0     0     2     2     0     2     0     0
     2     2     2     0     2     0     0     2     2     2     0
     2     2     2     2     2     2     2     2     2     2     0
     2     2     2     0     2     2     2     2     0     2     2
     2     0     2     0     2     2     2     2     2     0     0
     2     2     2     2     2     2     2     2     0     2     2];

mean(A==0,"all")

ans = 0.3636

[NAA]

yes! thank you!