why ascii instead of letter?

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huda nawaf
huda nawaf 2011-9-19
hi,
I want place 'a' instead of 1 as in :
x=[1 2 3 1]; >> for i=1:4 if x(i)==1 x(i)='a' end end
but the result: 97 2 3 97
why ascii is appearing?

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回答（2 个）

Walter Roberson
Walter Roberson 2011-9-19
You have initialized a numeric array rather than a character array. Numeric arrays cannot hold characters as characters. Only cell arrays can mix numerics with characters.
Fangjun Jiang
Fangjun Jiang 2011-9-19
Original x is a double array, but in your for-loop, you assign a char value to its element. So it takes the ASCII value of letter 'a'. see
double('a')
  2 个评论
huda nawaf
huda nawaf 2011-9-20
so , what I have to do?
thanks
Fangjun Jiang
Fangjun Jiang 2011-9-20
use cell array
%%
x={1 2 3 1};
for i=1:4
if x{i}==1
x{i}='a';
end
end

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