MATLAB: Error: Expression or statement is incorrect–possibly unbalanced (, {, or [.

errorsyntax

I am trying to choose specific rows from X which is 1149×13120 double. This is the code I am using:

X=([2
4
6],:);

Where 2 4 6 are pasted from an excel spreadsheet. For this particular analysis I only want to analyze data from these 3 subjects. This has worked for me in previous versions of MATLAB, but now I get the error above. Does anyone know what I am doing wrong?

Thanks.

Best Answer

After I edited your Question so I could see the formatting, the problem is that you need to reference a specific array, not simply the subscripts, and put everything on one line. Change the assignment to:

X_246 = X([2 4 6],:);

and if the rest of the array addressing is correct, it should run without error.

NOTE: This is obviously untested code.

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MATLAB: Error: Expression or statement is incorrect–possibly unbalanced (, {, or [.

The parentheses are correct, assuming there is not another typo where you forgot to include an extra parenthesis, bracket, or brace somewhere.

Based on John's suggestion, try this fix:

[unneeded, unneeded, cmat] = svm(numOfReturnedImages, dataset, queryImageFeature, metric);

And base on what Massimo said, you might want svmtrain() or svmclassify(), unless you have your own svm() function that you wrote.

MATLAB: Error using .* Matrix dimensions must agree.

You may have to use the bsxfun (link) function to make it work on both machines without encountering compatibility problems. In R2016b (if I remember correctly) ‘implicit expansion’ became the default, so operations that previously required bsxfun would then work without it. So I suspect your machine is running R2016a or earlier, and the uni machine is running R2016b or later.

This bsxfun call:

x=[1 2];
y=[3;4];
z = bsxfun(@times, x, y)
z =
     3     6
     4     8

will give you the result you expect.

Best Answer

Related Solutions

MATLAB: Error: Expression or statement is incorrect–possibly unbalanced (, {, or [.

MATLAB: Error using .* Matrix dimensions must agree.

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