create special matrix without use from for loop

i wish create several matrix with out uses from for loop

for example

   j=1;

for i=2:2:(2*T)
a=zeros(1,2*T);
a(i-1)=1; a(i)=-1;
one(j,:)=a;
j=j+1;
end

that every time T Replaced different number

Answer 1

[Walter Roberson]

For any given T,

a = zeros(T,2*T);
a(1:2*T+1:end) = 1;
a(T+1:2*T+1:end) = -1;