count the number of transitions from 0 to 3 in cells in cell array
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merialu
am 13 Nov. 2018
Bearbeitet: merialu
am 13 Nov. 2018
Hi.
I have a cell array containing 1000 cells. in each cell there is a matrix with different number of rows but with 50 columns.
the rows contains number from 0-3. I want to count how many times a 0 is followed by a 3 in each column.
Below you can see the code that I used to count the total number of transitions, from any number to another. Is there an easy way to change this code so that it counts the number of transitions from a certain number to another?
x=numel(CA)
newCA=cell(x,1);
for i=1:x
newCA{i}=sum(diff(CA{i})~=0);
end
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Stephen23
am 13 Nov. 2018
Bearbeitet: Stephen23
am 13 Nov. 2018
Here is a simple method based on logcal arrays, demonstrated on two Nx4 matrices in a cell array. The first matrix has two 0,3 transitions, the second matrix has three.
>> C = {[0,1,2,3;0,3,0,3;0,2,0,1],[0,3,1,2;3,2,1,0;3,0,3,0;3,0,3,3]};
>> C{:}
ans =
0 1 2 3
0 3 0 3
0 2 0 1
ans =
0 3 1 2
3 2 1 0
3 0 3 0
3 0 3 3
>> F = @(m) nnz(m(:,1:end-1)==0 & m(:,2:end)==3);
>> V = cellfun(F,C)
V =
2 3
>> N = sum(V)
N = 5
3 Kommentare
Stephen23
am 13 Nov. 2018
>> C = {[0,0,0,0;3,1,2,0;0,0,3,1;3,3,0,1],[1,1,0,3;0,3,3,3;3,3,3,0]};
>> C{:}
ans =
0 0 0 0
3 1 2 0
0 0 3 1
3 3 0 1
ans =
1 1 0 3
0 3 3 3
3 3 3 0
>> F = @(m) sum(m(1:end-1,:)==0 & m(2:end,:)==3, 1);
>> D = cellfun(F,C,'uni',0);
>> M = vertcat(D{:}) % for each matrix
M =
2 1 0 0
1 0 1 0
>> sum(M,1) % for all matrices
ans =
3 1 1 0
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