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How do you multiply the letter "a" by 3?

조회 수: 71 (최근 30일)
Muhendisleksi
Muhendisleksi 2017년 9월 1일
편집: Stephen23 2017년 9월 1일
a =
'x'
>> a*3
Undefined operator '*' for input arguments of type 'cell'.
The result I want to achieve: 3*x
  댓글 수: 5
the cyclist
the cyclist 2017년 9월 1일
Stephen23
Stephen23 2017년 9월 1일
편집: Stephen23 2017년 9월 1일
Given
a = 'x'
and
>> a*3
Undefined operator '*' for input arguments of type 'cell'.
and the statement "The result I want to achieve: 3*x", what is x supposed to be? Is this a reference to something else?

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답변 (4개)

the cyclist
the cyclist 2017년 9월 1일
편집: the cyclist 2017년 9월 1일
If you have a character array and you want to replicate it, use repmat:
repmat('a',1,3)

the cyclist
the cyclist 2017년 9월 1일
If you are trying to multiply a symbolic variable, then you should just be able to use mtimes as you have done. But why is your symbolic in a cell array?

Steven Lord
Steven Lord 2017년 9월 1일
Multiplying a cell array by a number is not defined, regardless of what the cell in the cell array contains. So something like 3*{'a'} will error.
Multiplying a char array by a number is defined, but it will not do what you're trying to do. Since the ASCII value of 'a' is 97 (which you can find using the command double('a')) computing 3*'a' returns 291 (= 3*97).
If you have Symbolic Math Toolbox, define a to be a symbolic variable then multiply that symbolic variable by 3 to do what you're trying to do.
syms a
y = 3*a
You can check if you have Symbolic Math Toolbox installed by looking for it in the output of the ver function.

Jan
Jan 2017년 9월 1일
Perhaps you do not want a symbolic calculation but a string manipulation.
c = {'a'}
b = sprintf('%d%s', 3, c{1});

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