Creating an Indicator Vector

So I am wondering how I create an indicator vector using pivot columns that I stored. Essentially I have created a varible, 'pivot' that stores the columns,c, where there is a pivot entry at.

Example: If the matrix is [1 0 0 0 0; 0 0 1 0 0; 0 0 0 0 1] pivot = [1,3,5]

Now since I found those pivots I want to create an indicating vector using these column values... so if I have a vector called indvect = zeros(1,n), I want to add 1 to the columns of that indvector where there is a pivot...

Example: pivot =[1,3,5] indvector = zeros(1,n)

I want the indvector to be [1 0 1 0 1]

Any help is much appreciated

My code is below

function B= NullBasis(A)

indvector= zeros

thresh = 1e-6

[m n]= size(A);

r=0;

A=rref(A)

for r=1:1:m

r

c=1

if A(r,:)* A(r,:)'> thresh

while abs(A(r,c))< thresh && c<n

c=c+1;

end

end

pivot(r) = c

end

end

Answer 1

[madhan ravi]

 indvector(pivot) = 1

[Alex Wieseler]

Thank you so much!!