Cody

# Problem 1740. Find number patterns in rows of a matrix...

Created by Chris E. in Community

So I think this may be a hard one, may be it was only hard for me! So here is what it is, I will give a matrix, with some number of rows by 5 columns, to make it simpler I will not repeat any number in a single row, so all numbers in a single rows are unique. So you need to find up to 2, 3 or 4 numbers that are found in a single row that repeat in other rows and the amount of times they repeat in a given matrix. To make it a little better, you only need to display the rows/numbers that repeat at lease twice or more. Examples are the best way to show what to do:

```          %p is the given matrix
p = [1 2 3 4 5;
2 3 4 5 1;
3 4 6 7 8;
1 2 4 3 5;
4 6 3 2 1];
%v is the amount of elements per row that are being checked to see if they repeat in another row
v = 4;
%Output:
out =```
```             1     2     3     4     4
1     2     3     5     3
1     2     4     5     3
1     3     4     5     3
2     3     4     5     3
%So the first to the fourth column are the four number that were found to repeat in rows of matrix p (any and all combination that can appear in the rows of the matrix p). The fifth column is the amount of times the that particular set of matrix out(?,1:4) appear in matrix p. for for row one in matrix out, 1,2,3 and 4 in any combination appear 4 time in the rows of matrix p.```
`      So more examples...`
```      p = [1 2 3 4 9;
2 3 1 4 8]
v = 4;```
```      out =
1     2     3     4     2
%so any combination of 1,2,3 and 4 appear 2 times in matrix p```
`    and another:`
```    p = [1 2 3 4 9;
2 3 1 4 8;
3 4 2 7 1]
v = 3;```
```    out =
1     2     3     3
1     2     4     3
1     3     4     3
2     3     4     3
%so this uses any combo of 3 values, so in this case out(?,1:3) are the number combos that can be found in matrix p, and the out(?,4) is the amount of times that those combos are found```
`    last example:`
```    p = [1 2 3 4 9;
2 3 1 4 8]
v = 2;```
```    out =
1     2     2
1     3     2
1     4     2
2     3     2
2     4     2
3     4     2
%so in this case only combos of out(?,1:2) are found and out(?,3) is the amounts of times that combo of out(?,1:2) is found in matrix p. so row four of matrix out (so out(4,:)...) shows that the combo of 2 and 3 are found 2 times in matrix p.```

NOTE: only display any row number combos that occur at least 2 times or more!

I hope I gave enough instructions and explanation, if not please let me know and I will add to it! Thanks and good luck!

### Solution Stats

55.0% Correct | 45.0% Incorrect
Last solution submitted on Jan 19, 2019