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draw a function composed of sin and cos

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khaled Abdelghafar
khaled Abdelghafar 2022-2-26
评论： Steven Lord 2022-2-26
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)

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Star Strider
Star Strider 2022-2-26
Ran in:
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.));
↑ ↑ ↑ ↑
See Array vs Matrix Operations for details.
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 个评论
Steven Lord
Steven Lord 2022-2-26
Ran in:
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
ans = logical
1
Note that something like this would error instead.
x = 1.1 .- 1
Invalid use of operator.

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