Error in ()-indexing must appear last in an index expression.

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Manjutha Manavalan 2017-2-16

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https://ww2.mathworks.cn/matlabcentral/answers/325316-error-in-indexing-must-appear-last-in-an-index-expression

评论： Manjutha Manavalan 2017-2-17

can any one help me to rectify this error Thank you in advance.

for i=1:NumFrames
    ft(i,:)=abs(fft(windowed(i,:))(1:frameSize/2));
end

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Rik 2017-2-16

Please give the complete stack of the error and explain the thing you want to do. You could also have a look here for a few pointers on how to ask a question so you increase the chance on a fast answer.

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Answer 1

Rik 2017-2-16

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I think your problem is this:

You call a function, whose result is a vector, from which you need only specific values. In Matlab, you can't combine those two things. (If you use cells, you can most of the times)

for i=1:NumFrames
    temp=fft(windowed(i,:));
    ft(i,:)=abs(temp(1:frameSize/2));
    %you need to be sure that frameSize is even, if you are not, use round(frameSize/2)
end