Can I pull a single character froma string?

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I'm trying to pull a single character from a user defined string.

A = "Hello, World";
B = "W";

I have A, I want to get B from it. I have tried

B = A(end-3);

as well as

B = A(8);

the former gave me the following error "Subscript indices must either be real positive integers or logicals," and the latter worked about as well as is expected.

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Stephen23 2017-9-15

编辑：Stephen23 2017-9-15

The whole point of strings is that they are atomic, and each string constitutes one whole element of a string array. So what you are doing is a bit contradictory to the concept of a string. Of course getting one character of a character array is trivially easy, so you could just convert the string to a char array and use indexing.

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