MATLAB: How to concatenate vectors of different dimensions

concatenationfeature extraction

From a set of 3000 images, I have extracted HOG (dimension: 3000*6084 single) and LBP (dimension: 3000*10) features. How can I concatenate these features of different lengths?

Best Answer

They have the same number of rows, so you can concatenate horizontally

[HOG,LBP]

Related Solutions

MATLAB: Concatenate

Paulo answered the question as you phrased it, but if you know the exact number of results you are producing (or if the maximum number of results is "reasonably close" to the likely number of results), then you are better off pre-allocating memory for the results:

a = zeros(10,1);
for b = 1:10
  a(b) = 3*b+5;  %for example
end

When you get to thousands of elements, pre-allocating can be much much faster.

MATLAB: Concatenate

This makes the 5x3 that you requested.

c1 = {'hello' 'world' 'Happy Tuesday'};
c2 = {'Need' 'coffee' 'now'};
m1 = magic(3);
C = vertcat(c1,c2,num2cell(m1));

To make a 3x5 use;

C = horzcat(c1',c2',num2cell(m1));

Best Answer

Related Solutions

MATLAB: Concatenate

MATLAB: Concatenate

Related Question