Coordinate system

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niko kauppinen
niko kauppinen 2011-2-7
Hi
How i can change coordinate origin to point just generated?
Example: X0=rand*10 y0=rand*10
Now i have random point(1) and i want to generate new point(2) from point(1), with random angle 2pi.Also i want certain distance from point(1) eg.2.5
I tried theta=rand*2*pi y= sin(theta) x= cos(theta) ??? i don't know how to get distance to point(2)
points are not coming around point(1) I think i have to change coordinate system center of point(1)?
Can anyone give advice

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采纳的回答

Walter Roberson
Walter Roberson 2011-2-7
To change the coordinate system, you would create a hggroup object and use makehgtform . For more information, please see here
That answers what you actually asked, but I would not recommend it in your case.
Dist = 2.5;
theta = rand*2*pi;
y = y0 + Dist * sin(theta);
x = x0 + Dist * cos(theta);

更多回答（2 个）

Andrew Newell
Andrew Newell 2011-2-7
If your object is to generate some random points in a circle around (x0,y0), you could do this:
radius = 2.5;
N = 5; % put the number of points you want here
theta = rand(N,1)*pi;
x = x0 + radius*cos(theta);
y = y0 + radius*sin(theta);
Matthew Simoneau
Matthew Simoneau 2011-2-7
Are you asking about transforming Cartesian to polar coordinates? If so, cart2pol will do this.
>> x0=rand*10;
>> y0=rand*10;
>> [th,r] = cart2pol(x0,y0)
th =
0.1530
r =
6.3984
I don't understand the rest about generating a new point.

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