draw a function composed of sin and cos
2 views (last 30 days)
Show older comments
khaled Abdelghafar
on 26 Feb 2022
Commented: Steven Lord
on 26 Feb 2022
i encounter an error when trying ti plot this function
x=-pi:0.1*pi:pi;
y1=100*sqrt(2*pi)/sqrt(0.05*pi).*cos(x/2)*(1.-cos(x/2.)*sin(x/2.)*sin(3.*x/2.));
figure
plot(x,y1)
0 Comments
Accepted Answer
Star Strider
on 26 Feb 2022
Use element-wise operations
y1=100*sqrt(2*pi)/sqrt(0.05*pi).*cos(x/2).*(1.-cos(x/2.).*sin(x/2.).*sin(3.*x/2.));
↑ ↑ ↑ ↑
x=-pi:0.1*pi:pi;
y1=100*sqrt(2*pi)/sqrt(0.05*pi).*cos(x/2).*(1.-cos(x/2.).*sin(x/2.).*sin(3.*x/2.));
figure
plot(x,y1)
.
1 Comment
Steven Lord
on 26 Feb 2022
What @Star Strider has written is correct but one section might be slightly misleading for newer users.
% (1.-cos(x/2.).*sin(x/2.).*sin(3.*x/2.))
That first part may make you think there is an operator .- that does element-wise subtraction. But that's not the case. That period is not part of the operator but part of the number itself, since subtraction already applies element-wise. [There's also no .+ operator; just + is sufficient.]
x = 1.; % one
y = 1; % also one
x == y % true
Note that something like this would error instead.
x = 1.1 .- 1
More Answers (0)
See Also
Categories
Find more on Annotations in Help Center and File Exchange
Community Treasure Hunt
Find the treasures in MATLAB Central and discover how the community can help you!
Start Hunting!