how to select a random number from the existing matrix in each column

Dear friends, I need to select a random number from each column from the existing matrix to create a new row as shown below: I'm new to matlab. So please help me with this. Thank you.

A=[1 2 3 4;5 6 7 8;9 10 11 12]

Anew=[5 2 7 12]

Answer 1

[Roger Stafford]

[m,n] = size(A);
Anew = A(randi(m,[1,n])+m*(0:n-1));

Answer 2

[per isakson]

It's smarter to use a for-loop

>> A
A =
     1     2     3     4
     5     6     7     8
     9    10    11    12

>> [nrow,ncol] = size(A);
>> ix = randi([1,nrow],[1,ncol])
ix =
     3     1     3     1
>> A(sub2ind(size(A),ix,1:ncol))
ans =
     9     2    11     4

[PRANAY DISHAN]

Thank you sir.It was very helpful.