When execute the below code ? the error message appear 'Index exceeds the number of array elements'?

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for i=1:16
M(end+1:end+4)=dec2bin(hex2dec(M_h(i)), 4);
Warning: Hexadecimal numbers representing integers greater than or equal to flintmax might not be represented exactly as double-precision floating-point values.
Index exceeds the number of array elements. Index must not exceed 1.

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Jérôme 2022년 9월 12일
M_h and M are string arrays because you used "". Here, you want to work with char arrays using '' (See for example these links for details about them: https://www.mathworks.com/help/matlab/characters-and-strings.html, https://www.mathworks.com/help/matlab/ref/char.html, https://www.mathworks.com/help/matlab/ref/string.html).
If you use the following code, you will not have the error anymore:
for i=1:16
M(end+1:end+4)=dec2bin(hex2dec(M_h(i)), 4);
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추가 답변(1개)

Walter Roberson
Walter Roberson 2022년 9월 21일
Using extractBetween() as suggested by @Jérôme is the approved way to work with characters inside strings. But you can also go to a lower level... which will give you faster code.
Double-quotes like you had is used for a string array, so below I show looping over a string array and using {} to extract characters
M = strings(size(M_h));
for K = 1 : numel(M_h)
this_M_in = M_h{K};
this_M_out = blanks(64);
for i=1:16
this_M_out(i*4-3:i*4)=dec2bin(hex2dec(this_M_in(i)), 4);
M(K) = string(this_M_out);
M = 2×1 string array
"1111111111111111111111111111111111111111111111111111111111111111" "1101111010101101101111101010111111011110101011011011111010101111"
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