MATLAB: I am getting an error as “Operands to the || and && operators must be convertible to logical scalar values. Error in xd (line 8) if (t>=t1)&&(t

displacement

my code is 
t1 = 0;
t2 = 10;
t3 = 20;
t4 = 30;
t = 0:50;
if (t>=t1)&&(t<t2)
    r = 0.6;
    if (t>=t2)&&(t<t3)
    r = 0.3;
    if (t>=t3)&&(t<t4)
    r = 0.3;
    if (t>=t4)
    r = 0.6;
    end
    end
    end
end
plot(t,r)

Best Answer

You cannot compare a vector t (which is 1x51 double) with a single value for an if statement, with the logical operators. Even if you could, the plot at the end won't give anything. I believe you want to do this. 
t1 = 0;
t2 = 10;
t3 = 20;
t4 = 30;
t = 0:50;
r = zeros(length(t),1);
for i = 1:length(t)
    if (t(i)>=t1)&&(t(i)<t2)
            r(i) = 0.6;
    elseif (t(i)>=t2)&&(t(i)<t3)
            r(i) = 0.3;
    elseif (t(i)>=t3)&&(t(i)<t4)
            r(i) = 0.3;
    else 
            r(i) = 0.6;
    end
   
end
plot(t,r)
axis([0 60 0.2 0.7])
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