change columns in array to zeros and assign to another vector

hi

I have a (n,3) array, I need to make the first and second coulmns zeros, and assign the resulted array to a new one

g=(a{1}(:,[1 2])==0);

tried this but not work

Answer 1

[KSSV]

n = 10 ; 
A = rand(n,3) ; % matrix for demo 
A(:,1:2) = 0 ;  % make first two columns zero 
B = A ;  % assign tp B

[Oday Shahadh]

if a is

a =

[21x3 double]

[21x3 double]

[21x3 double]

[21x3 double]

[21x3 double]

how can I do this for all arrays?

[Oday Shahadh]

v=cell(numel(a),1);

for i = 1:numel(a);

a{i}(:,1:2)=0;

v(i)=a{i};

end

not work

[KSSV]

b = a ; 
for i = 1:numel(a)
    b{i}(:,1:2) = 0 ; 
end