Error with if elseif statements

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Bree
Bree 2016-11-30
评论： Vaibhav Sharma 2018-2-18
My program is set up to ask the user for an input variable, as follows:
GOAL=input('WHAT IS YOUR GOAL?(FIT=FITNESS, FB=FAT BURN, N=NEITHER): ','s');
Then, I wrote an if, elseif statement written as:
if GOAL==('FIT')
I wrote the same thing for if GOAL==('FB') and if GOAL==('N'), and each is followed by functions to be executed for whichever the user chooses.
The error message that I am getting says:
Error using == Matrix dimensions must agree.
Am I approaching it wrong? Anything helps, thanks.
  1 个评论
Vaibhav Sharma
Vaibhav Sharma 2018-2-18
I get the exact message for a different function of question answering

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采纳的回答

bio lim
bio lim 2016-11-30
I suggest you to use strcmp
GOAL=input('WHAT IS YOUR GOAL?(FIT=FITNESS, FB=FAT BURN, N=NEITHER):\n ','s');
if strcmp(GOAL, 'FITNESS')
sprintf('GOOD')
elseif strcmp(GOAL, 'FB')
sprintf('ALSO GOOD')
else strcmp(GOAL, 'N')
sprintf('WHAT YOU SEEK HUMAN')
end
  2 个评论
Vaibhav Sharma
Vaibhav Sharma 2018-2-18
I too am forced to thank you for making me aware of that function

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更多回答（1 个）

Daniel kiracofe
Daniel kiracofe 2016-11-30
In matlab, strings are arrays of characters. Two strings with different lengths have different array dimensions. e.g.
'dog' is a 3x1 character array.
'bird' is a 4x1 character array
So something like this
if ('dog' == 'bird')
will give an error because you are trying to compare a 3x1 array with a 4x1 array, and to compare arrays they must have the same length.
try the strcmp() function instead. i.e
if strcmp(GOAL, 'fit')

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