I have a matrix which looks like this -
val =
[
1, a, b, c;
1, c, d, e;
1, a, b, d;
2, e, d, c;
2, r, t, v;
3, e, t, z;
3, r, t, x;
3, d, e, v;
3, r, d, f;
4, f, d, x;
1, r, t, c;
2, r, x, t;
4, a, d, x;
]
it may have varying numbers of rows. The first column contains the identifier that I want to use to sort the data such that all the columns with the index 1, or 2, or 3, or 4 are in one separate matrix. So for the example above, I should be able to create 4 matrix with the rows for the values from the three columns in that specific index.
So the output will be -
val_index1 =
[
1, a, b, c;
1, c, d, e;
1, a, b, d;
1, r, t, c;
]
val_index2 =
[
2, e, d, c;
2, r, t, v;
2, r, x, t;
]
val_index3 =
[
3, e, t, z;
3, r, t, x;
3, d, e, v;
3, r, d, f;
]
val_index4 =
[
4, f, d, x;
4, a, d, x;
]
How can I do this?
many thanks for your suggestion, Vijoya
