How do I draw a graph using a for if statement?

question is this

(20>=x>=-10)

for t=1:0.01:30

x(t)=t-11;

if x(t)<0;

y(t)=5;

elseif 0<=x(t) & x(t)<10

y(x-11)=5*x+5;

else x(t)>10

y(x(t))=5*sqrt(10*(x(t))+5);

end

end

x=-10:0.01:20;

plot(t,y)

but i get this answer

Array indices must be positive integers or logical values.

so... how i solve this problem?

Answer 1

[KSSV]

x = 0:0.01:30 ; 
y = zeros(size(x)) ; 

y(x<0) = 5 ; 
idx = 0 >= x & x <10 ;  
y(idx) = 5*x(idx)+5 ; 
y(x >= 10) = 5*sqrt(10)*x(x >= 10)+5 ;

plot(x,y)

[현석 송]

i need to use for if statment... :(.....

[KSSV]

x = 0:0.01:30 ; 
y = zeros(size(x)) ; 
for i =1:length(x)
    y(i) = myfunc(x);
end
plot(x,y)



y = myfunc(x)
if x <0 
    y = 5 ;
elseif 0 >= x && x <10 ;
    y = 5*x+5 ;
elseif x >= 10
    y = 5*sqrt(10)*x+5 ;
end