# How to create a matrix with all possibles cambinations between nodes of 3 sets?

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Jennifer Arellana on 5 Apr 2021
Hello to all,
I am working in Matlab with data of Ampl, so i am using amplapi. I want to creat a matrix of all possibles combinations between the nodes in the sets O, C and P, but using the data of the parameter CT. For example i have this data:
O = {'O2','O3','O4','O5'}
C = {'C1','C2','C3','C4'}
P = {'P1','P2','P3','P4'}
CTocp = {[196]
[146],
[154],
[244],
[317],
[129],
[140],
[224],
[246],
[256],
[314],
[161],
[333],
[292],
[245],
[183],
[296],
[246],
[222],
[293],
[291],
[138],
[174],
[174],
[229],
[227],
[164],
[166],
[176],
[115],
[184],
[237],
[305],
[316],
[128],
[158],
[234],
[345],
[211],
[142],
[313],
[330],
[135],
[315],
[262],
[208],
[286],
[172],
[305],
[316],
[128],
[158],
[196],
[146],
[154],
[244],
[313],
[330],
[135],
[315],
[296],
[246],
[222],
[293]}
I notice that i have to convert the parameter CTocp in a matrix 3d for it run, so I did the next:
CTocp = reshape(CTocp,4,4,[])
Then, for create a matrix with all possible combination i use:
df_CTocp = DataFrame(3, 'O', 'C', 'P', 'CTocp');
df_CTocp.setMatrix(CTocp, O, C, P)
df_CTocp
The problem is the order that the matrix have, i want that the matrix df_CTocp in the column CTocp has the same order that has the matrix CTocp.

Aditya Patil on 8 Apr 2021
You can use meshgrid function as below
[x,y,z] = meshgrid(C,O,P);
This gives you all combinations of C/O/P.

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