MATLAB: Does char give me an empty output

char

>> b=[1,2,3,4,5]
b =
     1     2     3     4     5
>> char(b)
ans =
this is what I enter and the output is five little empty boxes. I've tried this with several numeric vectors and matrices and it does the same thing with varying numbers of boxes. It also does this if I manually input the vector. It was working previously, and then it wasn't I'm not sure what I'm doing wrong

Best Answer

Characters for ASCII codes 1, 2, 3, 4, 5 are all unprintable characters, so nothing prints. The conversion did take place, but the result is not printable (displayable). The characters are:
1   01   SOH   Start of heading
2   02   STX   Start of text
3   03   ETX   End of text
4   04   EOT   End of trans.
5   05   ENQ   Enquiry
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