MATLAB Answers

## need help in random sampling of all possible combinations

Asked by Utpal Bakshi

### Utpal Bakshi (view profile)

on 11 Feb 2013

Hi all,

I have an input file (input.txt) in tab separated format. A small part of the input file is as follows:

```Gr1 Gr2 Gr3 Gr4    ..............
row1 1 1 1 0       ..............
row2 0 1 0 1       ...............
row3 1 1 0 1       ..............
...................
.................
```

From this input,random sampling of all possible Group combinations needed to be taken, and print in a output file. From the above input, the output file should be as follows (the three columns are: Number of groups used in analysis, Group names, Number shared between these groups;;; Shared number are measured if 1 is present in all the measuring groups).

output:

```2 Gr1-Gr2 2
2 Gr1-Gr3 1
2 Gr1-Gr4 1
2 Gr2-Gr3 1
2 Gr2-Gr4 2
2 Gr3-Gr4 0
3 Gr1-Gr2-Gr3 1
3 Gr1-Gr2-Gr4 1
3 Gr1-Gr3-Gr4 0
3 Gr2-Gr3-Gr4 0
4 Gr1-Gr2-Gr3-Gr4 0
```

Any idea how to do it??? thanks in advance..

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## 1 Answer

### Youssef Khmou (view profile)

Answer by Youssef Khmou

### Youssef Khmou (view profile)

on 11 Feb 2013

hi,

You can create a cell in which you can store all your variables (2,Gr2,Gr4,...) (cell because you have heterogeneous data), and then you can obtain all possible combinations by using the function perms :

An example using cell A with 3 elements :

``` A{1}='Utpal';
A{2}='that is you';
A{3}=3.14458741;```
` B=perms(A);`

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