Finding specific number of characters in vector

I have a character vector ( c = ['a' 'r' 'y' 'z' 'b' 'u' 'k'] ) and I would to determine the number of characters that are not b or r. How do I do this using logical operators?

[Stephen23]

Note that

c = ['a' 'r' 'y' 'z' 'b' 'u' 'k'];

is just a more complex and less efficient way of writing

c = 'aryzbuk';

You do not need to concatenate individual characters to make a character vector. It is totally superfluous. No experienced user would bother doing this.

Answer 1

[Stephen23]

>> c = 'aryzbuk';
>> nnz(c~='b' & c~='r')
ans =  5

Answer 2

[Ameer Hamza]

Try setdiff()

c = ['a' 'r' 'y' 'z' 'b' 'u' 'k'];

n = numel(setdiff(c, ['b' 'r']));