Error using == Matrix dimensions must agree.
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Hi, I want a solution to this problem. Someone can help me?
Error in operations (line 5)
elseif c == 'multi'
采纳的回答
Star Strider
2015-5-30
I have no idea what the matrix dimension problem is, since we have only one line of your code. However, the way to compare strings and string variables is to use the strcmp or strcmpi functions.
So the correct syntax for the line you posted would be:
elseif strcmpi(c, 'multi')
7 个评论
Alvaro Arenas
2015-5-30
编辑：Star Strider
2015-5-30
Star Strider
2015-5-30
The logic in your code is correct. I experimented with all the options.
You can realistically have only one output, not three, so I would change your code to:
function [out] = operations(M,c)
out = NaN;
if strcmpi(c, 'suma')
out = M+M;
elseif strcmpi(c, 'multi')
out = M*M;
elseif strcmpi(c, 'expo')
out = M^M;
end
end
That should eliminate the error.
The initial assignment setting out to NaN covers the error condition when nothing matches ‘c’ correctly. The operation would not be defined, so that would actually be appropriate.
Alvaro Arenas
2015-5-31
Star Strider
2015-5-31
My pleasure.
If my Answer helped you resolve your problem, please Accept it.
KenoKanawa
2018-11-16
Thank you, it solved my problem too !
Star Strider
2018-11-16
@KenoKanawa — My pleasure!
Dunzhi Chen
2020-6-25
Thanks, this solved my problem!
更多回答（1 个）
Pronoy Das
2021-2-25
编辑：Pronoy Das
2021-2-25
2 个投票
I came across a similar problem. Simply replace the single quotation marks with the double quotation marks, i.e. replace the line in your code with
c == "multi"
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