how to produce a logical matrix using index matrix

Hi, i need some help here, im also new in matlab. i have 'b' containing index matrix for example b=1; i want to create logical matrix and should be [1 0 0 0]

if i have b = 2, the matrix will be [0 1 0 0]. Hope i find some solutions. TQIA

Answer 1

[per isakson]

Try

logical_matrix = false( 1, 4 );
logical_matrix( b ) = true;

[Khairul Nur]

actually i have 40 rows of data.. i try to fit in the code..

for n = i:40
    Z=(D(i,:))
    %function minmat return a= value min b=index min
    [a,b] = minmat(Z)
    DM(i,:) = false( 1, 4 );
    DM(i,:)( b ) = true; %having some problem here!!

[Walter Roberson]

DM(i,b) = true;

[Khairul Nur]

great! its work..thank you very much :)