how can I change a n*1 matrix to a n*6 matrix with a condition based on column value?

Hi, i'm pretty new so any help would be appreciated.

I have 700000*1 matrix with the column values that are between 1 to 6 and i want to make a new matrix of 700000*6 (having 6 colulmns instead of 1) and the values of the columns in new matrix in each row would be 1,0 in a way that 1 would show the value in the original matrix.

for example :

original =

[ 1

2

1

3

5]

and i want the new matrix look like this :

[1 0 0 0 0 0

0 1 0 0 0 0

1 0 0 0 0 0

0 0 1 0 0 0

0 0 0 0 1 0]

I've tried by making a blank 700000*6 matrix first but i can't figure out how to put values in the new matrix the way i want.

Answer 1

[dleal]

If you have the Statistics and Machine Learning Toolbox you can do use dummyvar:

A = [1,1,2,4,4, 5,6]';
>> dummyvar(A)

ans =

1     0     0     0     0     0
1     0     0     0     0     0
0     1     0     0     0     0
0     0     0     1     0     0
0     0     0     1     0     0
0     0     0     0     1     0
0     0     0     0     0     1

Answer 2

[David Hill]

n=randi(6,700000,1);
a=zeros(size(n,1),6);
a(:,n)=1;