How to have a function return a coordinate point?

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Connor
Connor 2023-2-12
编辑： Torsten 2023-2-12
I am trying to get a function to return (x,y) coordinates for a given angle theta. I am struggling to figure out how to get the output of the function to be coordinate points and not two seperate variables x and y.
This is what I have for the function:
function [x,y] = unitCircle(theta)
[x,y] = [cos(theta),sin(theta)]
end
And when I call the function using:
[x,y] = unitCircle(pi/4)
I get an error:
Too many output arguments.
Error in unitCircle (line 2)
[x,y] = [cos(theta),sin(theta)]

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采纳的回答

Torsten
Torsten 2023-2-12
Ran in:
[x,y] = unitCircle(pi/4)
x = 0.7071
y = 0.7071
function [x y] = unitCircle(theta)
z = [cos(theta),sin(theta)];
x = z(1);
y = z(2);
end
  4 个评论
显示 2更早的评论
Sulaymon Eshkabilov
Sulaymon Eshkabilov 2023-2-12
Ran in:
This function file syntax has to be:
theta = -pi:.1:pi;
[x,y]=unitCircle(theta)
x = 1×63
-1.0000 -0.9950 -0.9801 -0.9553 -0.9211 -0.8776 -0.8253 -0.7648 -0.6967 -0.6216 -0.5403 -0.4536 -0.3624 -0.2675 -0.1700 -0.0707 0.0292 0.1288 0.2272 0.3233 0.4161 0.5048 0.5885 0.6663 0.7374 0.8011 0.8569 0.9041 0.9422 0.9710
y = 1×63
-0.0000 -0.0998 -0.1987 -0.2955 -0.3894 -0.4794 -0.5646 -0.6442 -0.7174 -0.7833 -0.8415 -0.8912 -0.9320 -0.9636 -0.9854 -0.9975 -0.9996 -0.9917 -0.9738 -0.9463 -0.9093 -0.8632 -0.8085 -0.7457 -0.6755 -0.5985 -0.5155 -0.4274 -0.3350 -0.2392
function [x y] = unitCircle(theta)
z = [cos(theta);sin(theta)];
x = z(1,:);
y = z(2,:);
end
Torsten
Torsten 2023-2-12
编辑：Torsten 2023-2-12
Ran in:
Doesn't work :-)
theta = (-pi:.1:pi).';
[x,y]=unitCircle(theta)
x = -1
y = -0.9950
function [x y] = unitCircle(theta)
z = [cos(theta);sin(theta)];
x = z(1,:);
y = z(2,:);
end

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更多回答（1 个）

Sulaymon Eshkabilov
Ran in:
Here is the corrected code:
% Ver 1
xy = unitCircle(pi/4)
xy = 2×1
0.7071 0.7071
function xy = unitCircle(theta)
xy=[cos(theta); sin(theta)];
end
  1 个评论
Sulaymon Eshkabilov
Sulaymon Eshkabilov 2023-2-12
Ran in:
Alt. version:
% Ver 2
theta = linspace(-2*pi, 2*pi);
xy=unitCircle(theta);
plot(xy(1,:), xy(2,:)), axis equal;
xlabel("x"), ylabel("y"), grid on
function xy = unitCircle(theta)
xy(1,:)=[cos(theta)];
xy(2,:)=[sin(theta)];
end

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