CODEWITHSUNDEEP
matlabcartesian-product
I.J. Abdul Hakeem
I.J. Abdul Hakeem

Reputation: 69

Cartesian product of undefined length Matlab

There is a downloadable function called CARTPROD which gives the cartesian product of given vectors (link to CARTPROD function)

For example

cartprod(1:3,1:3)

ans =
 1     1
 2     1
 3     1
 1     2
 2     2
 3     2
 1     3
 2     3
 3     3

However, is there a way in which I can specify how many times a given vector should be read in the cartesian product. I want something like this:

%If user chooses the vector to be used 4 times
cartprod(1:3,1:3,1:3, 1:3)

%If user chooses the vector to be used 2 times
cartprod(1:3,1:3)

I have tried thinking about it, but I can't think of doing it any way besides manually. Thanks!

Upvotes: 0

Views: 130

Answers (2)

Sardar Usama
Sardar Usama

Reputation: 19689

The other answer points out how you can use the same cartprod function from the FEX. However, there is another function named combvec (from the Neural Network Toolbox) which does exactly the same.

n = 4;  %Number of times to be repeated
myvec = repmat({1:3},1,n);    %Repeating the cell array vector
result = combvec(myvec{:}).'; %Converting to comma-separated list and applying combvec

Upvotes: 1

user2305193
user2305193

Reputation: 2059

What you're looking for is comma separated lists. Haven't tested this, but try 

myvec={1:3,1:3,1:3,1:3}; 
cartprod(myvec{:}); %get cartprod of all vectors in the cell-array.

or as @Sardar_Usama pointed out, you can replace myvec={1:3,1:3,1:3,1:3} with this:

n=4; %number of repeated vectors
myvec=repmat({1:3},1,n); %repeat cell-array {1:3} 4 times

Upvotes: 2

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