Replace matrix entries in Matlab based on their value and their index -


in matlab, want replace entries in matrix values equal row index one, , others zero.

for example 

a = [3 1 4      2 2 5      1 3 3];

and want have 

b = [0 1 0      1 1 0       0 1 1];

is there way efficiently?

bit more generic:

matlab before r2016b: 

b = bsxfun(@eq, a, (1:size(a,1)).');

matlab r2016b , later: 

b = ( == (1:size(a,1)).' );

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