Create an ellipse at 45 degree angle
조회 수: 25 (최근 30일)
이전 댓글 표시
I am trying to create an ellipse of 1 standard deviation around the mean of a scatter plot. The scatter plot is a smear of points at a 45 degree angle.
I'm able to create an ellipse using:
rectangle('Position',cnr,'Curvature',[1,1]);
Where 'cnr' is [x y w h] of the ellpse, with the xy being the lower left corner of where the rectangle would start, but I haven't found anything on how to rotate the ellipse.
Thank you for any help you can give.
댓글 수: 0
채택된 답변
Star Strider
2022년 11월 22일
Try this instead —
v = linspace(0, 1);
rx = 0.5;
ry = 0.25;
x = rx*cos(2*pi*v + pi/4);
y = ry*sin(2*pi*v);
figure
plot(x, y)
grid
axis([-1 1 -1 1])
axis('equal')
Mak e appropriate changes to get the result you want.
.
댓글 수: 3
Torsten
2022년 11월 22일
I think a rotation by 45 degrees should be like this:
v = linspace(0, 1);
rx = 0.5;
ry = 0.25;
x = rx*cos(2*pi*v);
y = ry*sin(2*pi*v);
xx = x*cosd(45) - y*sind(45);
yy = x*sind(45) + y*cosd(45);
figure
plot(xx, yy)
grid
axis([-1 1 -1 1])
axis('equal')
Star Strider
2022년 11월 22일
추가 답변 (0개)
참고 항목
카테고리
Help Center 및 File Exchange에서 Scatter Plots에 대해 자세히 알아보기
Community Treasure Hunt
Find the treasures in MATLAB Central and discover how the community can help you!
Start Hunting!