MATLAB: Retrieving strings from struct variable

indexingMATLABstringstruct

Hello,

What I am trying to do is retrieve strings from a struct variable and store them in a vector. The struct variable is 16×1 with the first field holding the string data.

Here is what I tried, for example:

—————

for i = 1:16

stringVector(i) = structVar(i).stringField;

end

—————

Here is the error I am receiving:

"??? In an assignment A(:) = B, the number of elements in A and B must be the same."

Any thoughts?

Best Answer

stringvector should be a cell

stringvector = cell(16,1)
for ii = 1:16
    stringvector{ii} = structVar(ii).stringField
end

You could also skip the for-loop with

stringvector = {structVar.stringfield}

Related Solutions

MATLAB: Create variables from xlsx-file.

See the documentation on "xlsread" here:

http://www.mathworks.com/help/matlab/ref/xlsread.html

You can see that the second returned value (in your case, "y") is the text fields in a cell array. When you index with the {} brackets, what gets returned is a char array representation of that text. In your code, you are trying to set this char array into a numerical value (y1 is a double array). The data types are conflicting, so this does not work. I would recommend keeping the cell array representation returned by xlsread, as this is the easiest way to store/access strings that differ in length.

I would also like to second Stephen's comment. If it's true that you would like to create variables named after strings in your spreadsheet, I would highly recommend rethinking the design of your code. Stephen's link gives a great tutorial on alternatives.

MATLAB: How does one produce an array of strings automatically

Oliver, you could do

 n = 5;
 for ii = 1:n
   stringVector{ii} = strcat('v',int2str(ii));
 end

or simply

 stringVector = strcat({'v'},int2str((1:5)'));

Best Answer

Related Solutions

MATLAB: Create variables from xlsx-file.

MATLAB: How does one produce an array of strings automatically

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