MATLAB: How to convert from a matrix to a cell

num2cell

Given matrix is

A=[1 2 3 4 5 6 7 8; 9 10 11 12 13 14 15 16];

and output is

B={[1 2 3 4],[5 6 7 8];[9 10 11 12],[13 14 15 16]};

How can I do that?

Best Answer

Use the mat2cell function:

A=[1 2 3 4 5 6 7 8; 9 10 11 12 13 14 15 16];
B = mat2cell(A, [1 1], [4 4]);
B11 = B{1,1}                                            % Check Output

B22 = B{2,2}                                            % Check Output

Related Solutions

MATLAB: How to measure an angle of peaks in a plot

That completely depends on how you define ‘angle’.

This calculates the angle based on the peaks, and draws quiver arrows (‘angrad’ are the angles in radians):

angrad = atan2(pks,locs);
figure
hold on
plot(Y)
plot(locs, pks,"rx")
quiver(locs,pks,cos(angrad),sin(angrad), 0.25)
hold off

this calculates and draws arrows between adjacent peaks:

angrad = atan2(diff(pks),diff(locs));
figure
hold on
plot(Y)
plot(locs, pks,"rx")
quiver(locs(1:end-1),pks(1:end-1),cos(angrad),sin(angrad), 0.25)
hold off

There are likely several other ways as well.

This should get you started.

EDIT — (2 Oct 2020 at 12:31)

Corrected typographical error.

MATLAB: How to shuffle a matrix

Here are two methods to rearrange it according to your question. Adjust to suit the size of your matrix.

>> A=[1 2 3 4;5 6 7 8; 9 10 11 12; 13 14 15 16]
A =
    1    2    3    4
    5    6    7    8
    9   10   11   12
   13   14   15   16
>> cell2mat(reshape(cellfun(@(m)reshape(m.',2,2).',num2cell(A,2),'uni',0),2,2).')
ans =
    1    2    5    6
    3    4    7    8
    9   10   13   14
   11   12   15   16
>> reshape(permute(reshape(permute(reshape(A.',2,2,[]),[1,3,2]),4,2,[]),[1,3,2]),4,[]).'
ans =
    1    2    5    6
    3    4    7    8
    9   10   13   14
   11   12   15   16

Best Answer

Related Solutions

MATLAB: How to measure an angle of peaks in a plot

MATLAB: How to shuffle a matrix

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