how can i plot the function of each function?

I want to plot this function

f(x)=sinx, 0<=x<1

0, elsewhere

Then i wrote code for this function

x=-5:0.01:5;

if 0<=x<1

f=sinx;

else

f=0;

end

plot(x,y);

but when i plotted this code then, there was nothing on the graph

what's wrong on this code? and how can i plot this function?

Answer 1

[Stephen23]

"what's wrong on this code?"

• if does not change subsets of an array like that (you would need to use if inside of a loop).
• You also need to read the if documentation to know how it behaves with non-scalar conditions.
• MATLAB does not have ternary logical operators like 0<=x<1. What you wrote is equivalent to (0<=x)<1 which is equivalent to either 0<1 or 1<1 (but the first case will return true when you don't expect it to).

The MATLAB way is to use logical indexing, e.g.:

>> x = -5:0.01:5;
>> y = sin(x);
>> y(x<0|x>=1) = 0;
>> plot(x,y)

[akdlcnd3gh]

Thank you for your reply.

I think I still lack an understanding of how matlab works

[Stephen23]

Low-level languages: loops and ifs

High-level languages: functions and comprehensions

MATLAB: arrays and indexing

https://www.mathworks.com/matlabcentral/answers/228557-experts-of-matlab-how-did-you-learn-any-advice-for-beginner-intermediate-users

[akdlcnd3gh]

thank you so much!

I'll read carefully