How i can create a n+1 column matrix from n column matrix?

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suchismita
suchismita am 23 Apr. 2015
Kommentiert: suchismita am 24 Apr. 2015
i have a matrix 10*n, for example, let n=3
a= [ 1 2 3
1 2 4
1 2 5
1 3 4
1 3 5
1 4 5
2 3 4
2 3 5
2 4 5
3 4 5]
i want to create another matrix n+1
b=[1 2 3 4
1 2 3 5
1 2 4 5
1 3 4 5
2 3 4 5]
this is obtained from a as
{1 2 3} and from
{1 2 4}
{1 2 3 4} is created, where no pair must repeat and
{1 2 3} or
{1 2 4} or
{2 3 4}
all pair must be present in a or delete that pair.
please please help me.
i want to know how i can obtain a 4 column matrix from 3 column matrix, if i want 5 column from 4 column matrix then where is the main change in code.
please help me.

Akzeptierte Antwort

Roger Stafford
Roger Stafford am 23 Apr. 2015
It looks to me as if you need to use:
b = nchoosek(1:5,4);

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