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How do I change the orientation of a marker randomly?

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vishakha vijaykumar
回答： Thorsten 2017-4-12
I have created 2 random points represented by the '+' marker. I want to change the orientations of these 2 markers randomly. Can anyone help me out? This is my code so far
x=rand(1,2)*100;
y=rand(1,2)*100;
scatter(x,y,'+');
I want random orientations of the 2 '+' markers.
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KSSV
KSSV 2017-4-12
So is that the marker orientation you want to change? '+' is a marker which shows the location of your point on the graph. It is not the orientation of point.
vishakha vijaykumar
vishakha vijaykumar 2017-4-12
Yup the marker orientation. I apologize for the mistake . I will rephrase my question. Thank you.

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回答（2 个）

Roger Stafford
Roger Stafford 2017-4-12
If you mean random orientation with respect to the cartesian coordinate origin, and if the orientation change is to be the same for each point, then do this:
t = 2*pi*rand-pi;
x2 = x*cos(t)-y*sin(t);
y2 = x*sin(t)+y*cos(t);
Thorsten
Thorsten 2017-4-12
You have to draw two crossing lines of a random angle. You cannot change the orientation of Matlab's markers.
The following function may be useful; you have to adjust the size of marker using r depending on your axis, and use
axis equal
To get a random angle, set alpha to rand*2*pi.
function plotcrossmarker(alpha, r, x0, y0)
if nargin < 1, alpha = 0; end;
if nargin < 2, r = 1; end
if nargin < 3, x0 = 0; end
if nargin < 4, y0 = 0; end
x = r*cos(alpha);
y = r*sin(alpha);
xx = [-x x NaN -y y];
yy = [-y y NaN x -x];
line(xx + x0, yy + y0)

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