I am running an Ff statement and i Keep getting the error Matrix dimensions must agree... Help?

I am trying to run a statement that will run a specific command depending on the filename of the file I bring in.

The problem is the file names are different lengths eg. Min, Mean, Max.

So when I import the file name as a variable C == 'min' the first if statement works but then when it loops around to run the second else if C == 'mean' I get the error Matrix dimensions must agree. I assume this is becacuse I now have a 4 character string instead of a 3 character one as the elseif C == 'max' works.

Below is a copy of the code I'm working with. Please bare in mind I'm somewhat new to mablab :)

Thanks.

nX= length(X); 

for i = int8(1:nX)
      [filename9, dir] = uigetfile('C:\Outputs','Select WA Trial');
      load([dir filename9])

      C = regexp(filename9,'M[a-z]+','once','match');

       if C == 'Max'
          WAMax_Combined(i,:) = WAVariablesDiscreteMax;

      elseif C == 'Min'
          WAMin_Combined(i,:) = WAVariablesDiscreteMin;

      elseif C == 'Mean'

          WAMean_Combined(i,:) = WAVariablesDiscreteMean;

end
end

Answer 1

[Stephen23]

Method one: use strcmpi:

if strcmpi(C,'Max')
   ...
elseif strcmpi(C,'Min')
   ...
.. etc
   ...
end

Method two: use switch:

switch C
    case 'Max'
        ...
    case 'Min'
        ...
    case 'Mean'
        ...
    otherwise
        ...
end

Personally I think switch is the better solution, because it clearly indicates the purpose of the code.

[Sean Byrne]

Thankyou that helps alot

[Stephen23]

@Sean Byrne: I'm glad to help. Please remember to accept the answer that best resolves your original question: that is an easy way for you to show your appreciation, and that the question has been resolved.