Undefined operator '-' for input arguments of type 'cell'.

Question

mayur sonawale 2018-11-4

关闭： MATLAB Answer Bot 2021-8-20

for(i=1:size(Ftrain,1))

dist(1,:)=sum(abs(Ftrain(1,:) - Ftest));

end

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Answer 1

Image Analyst 2018-11-4

编辑：Image Analyst 2018-11-5

You can't subtract cells. You can subtract the contents of cell if they are numeric. So you need to use braces. See the FAQ: https://matlab.wikia.com/wiki/FAQ#What_is_a_cell_array.3F

Try it this way:

for(i=1:size(Ftrain,1))
    dist(1,:)=sum(abs(Ftrain{i,:} - Ftest));
end

Ftest must be of the same type as the contents of the cell, e.g. both doubles.

mayur sonawale 2018-11-5

my Ftrain is 5*2cell and Ftest is like [105.2527,42.8721]

Image Analyst 2018-11-5

编辑：Image Analyst 2018-11-5

But what's IN the cell? Inside each cell should also be a 1-by-2 vector. and you need to specify both row and column. Like this

thisCellsContents = Ftrain{i, someColumnNumber}
dist(i,someColumnNumber=sum(abs(thisCellsContents  - Ftest));

Perhaps you need another inner loop over column.

Attach Ftrain and Ftest in a .mat file if you still need more help so I don't waste time guessing.