Finding specific number of characters in vector

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Elijah L
Elijah L 2020-9-15
编辑： Stephen23 2020-9-15
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?
  1 个评论
Stephen23
Stephen23 2020-9-15
编辑：Stephen23 2020-9-15
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.

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回答（2 个）

Stephen23
Stephen23 2020-9-15
>> c = 'aryzbuk';
>> nnz(c~='b' & c~='r')
ans = 5
Ameer Hamza
Ameer Hamza 2020-9-15
Try setdiff()
c = ['a' 'r' 'y' 'z' 'b' 'u' 'k'];
n = numel(setdiff(c, ['b' 'r']));

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