I have a file with 4 columns of data. each column has 10 rows of data. I want to do all possible combinations of these 4 columns.

col1 col2 col3 col4

2 2.5 27 7.5

3 1.5 25 8.4

.

.

.

please help.

col1 col2 col3 col4

2 2.5 27 7.5

3 1.5 25 8.4

.

.

.

please help.

What do you mean by...

that?

I want to do all possible combinations of these 4 columns. |

that?

Is this what you mean?:

If this would be your array:

col1 col2 col3 col4:

A B C D

E F G H

then this would be the output:

A B C D

A B C H

A B G D

A B G H

A F C D

A F G D

...

E F G H

If this would be your array:

col1 col2 col3 col4:

A B C D

E F G H

then this would be the output:

A B C D

A B C H

A B G D

A B G H

A F C D

A F G D

...

E F G H

There is a next_permutation algorithm which can be used on a vector.

Have a read in the reference section top left of this page.

HTH

Have a read in the reference section top left of this page.

HTH

simpleasy

you are write. I want do the same combinations. 4 types of data with 10 different in each type can generate 10^4 = 10000 combinations. I could not understood how to use the next_permutation and how to read each column to develop the combinations.

you are write. I want do the same combinations. 4 types of data with 10 different in each type can generate 10^4 = 10000 combinations. I could not understood how to use the next_permutation and how to read each column to develop the combinations.

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