# define function in one line

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fumio hakamada on 23 Feb 2024
Commented: Rik on 23 Feb 2024
How can I define vector p without using function statement?
suppose
t = 0:0.1:1
p = sin(t) when t<0.6
p = 0 when t>=0.6
DGM on 23 Feb 2024
Edited: DGM on 23 Feb 2024
What's wrong with just
t = 0:0.1:1;
p = sin(t).*(t<0.6);
plot(t,p)
... of course, the range and resolution of t makes this plot appear a bit unclear.
fumio hakamada on 23 Feb 2024

Rik on 23 Feb 2024
I don't know if you want to avoid anonymous functions as well, but this should give you a finer plot:
% p = sin(t) when t<0.6
% p = 0 when t>=0.6
p = @(t) (t<0.6).*sin(t);
fplot(p,[0 1])
The problem here is mostly that sin(x) is very close to x for small x, which means you have a fairly straight line. Adding a straight line helps to show there is actually a slight curve:
p = @(t) (t<0.6).*sin(t);
figure
fplot(p,[0 1])
hold on
fplot(@(t) sign(p(t)).*t,[0 1])
legend({'y = sin(t)','y = x'})
fumio hakamada on 23 Feb 2024
Moved: Rik on 23 Feb 2024
I had no idea about logical vector and usage of ".*". Thanks for both of you.
Rik on 23 Feb 2024