Why is it saying "the expression to the left of the equals is not a valid target for an assignment" / "parse error at =" on my if statements?

could you tell me why it is saying that every time I say 'time='x''? here is my code:

exp=zeros(60,96,10);
time=randi([3 7]);
if time=3
   for j=1:size(exp,1);
    for jj=1:size(exp,2);
        rand=randi([1 8]);
        exp(j,jj,rand:rand+2)=1;
    end
   end
elseif time = 4 
    for j=1:size(exp,1);
    for jj=1:size(exp,2);
        rand=randi([1 7]);
        exp(j,jj,rand:rand+3)=1;
    end
    end
elseif time = 5 
    for j=1:size(exp,1);
    for jj=1:size(exp,2);
        rand=randi([1 6]);
        exp(j,jj,rand:rand+4)=1;
    end
    end
elseif time = 6 
    for j=1:size(exp,1);
    for jj=1:size(exp,2);
        rand=randi([1 5]);
        exp(j,jj,rand:rand+5)=1;
    end
    end
elseif time = 7 
    for j=1:size(exp,1);
    for jj=1:size(exp,2);
        rand=randi([1 4]);
        exp(j,jj,rand:rand+6)=1;
    end
   end

Answer 1

[Sebastian Castro]

For logical expressions, you want to use the double equals operator:

if time == 3
  % Do stuff
end

- Sebastian