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

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현석 송
현석 송 2021-10-6
评论： KSSV 2021-10-6
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?

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回答（1 个）

KSSV
KSSV 2021-10-6
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)
  2 个评论
KSSV
KSSV 2021-10-6
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

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