Matrix columns and how to equate them to vectors

Make/N=(10,3)/D a  // setting up a matrix 'a' with 10 rows and 3 columns<br />
Make/N=10/D b  // seting up a 10-row vector 'b'<br />
b={1,2,3,4,5,6,7,8,9,0} // set b values<br />
print b<br />
  b[0]= {1,2,3,4,5,6,7,8,9,0}<br />
a=0<br />
print a<br />
  a[0][0]= {0,0,0,0,0,0,0,0,0,0}<br />
a[0][1]= {0,0,0,0,0,0,0,0,0,0}<br />
a[0][2]= {0,0,0,0,0,0,0,0,0,0}<br />
a[][0]=b  // set first column of a to equal b<br />
print a  // which works as expected<br />
  a[0][0]= {1,2,3,4,5,6,7,8,9,0}<br />
a[0][1]= {0,0,0,0,0,0,0,0,0,0}<br />
a[0][2]= {0,0,0,0,0,0,0,0,0,0}<br />
<br />
a[][1]=b  // try to set the second column of a to equal b and...<br />
print a<br />
  a[0][0]= {1,2,3,4,5,6,7,8,9,0}<br />
a[0][1]= {0,0,0,0,0,0,0,0,0,0}<br />
a[0][2]= {0,0,0,0,0,0,0,0,0,0}<br />