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Re: Deleting multiple Values in an 2D-Array
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From: |
Stefan Mahr |
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Subject: |
Re: Deleting multiple Values in an 2D-Array |
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Date: |
Sun, 30 Dec 2012 20:39:37 +0100 |
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User-agent: |
Mozilla/5.0 (X11; Linux i686; rv:17.0) Gecko/17.0 Thunderbird/17.0 |
Nikolai Huckle wrote:
> I have two 200000x1 Arrays which I plot against each other. I have
> attached an example image.
> The issue I have is, that I only want the outline of the point cloud:
> the farthest points to the right, the left and upwards.
check out
http://www.gnu.org/software/octave/doc/interpreter/Convex-Hull.html#Convex-Hull
AJ = randn(1,1000);
EJ = randn(1,1000);
k=convhull(AJ,EJ);
plot(AJ,EJ,'*',AJ(k),EJ(k))
I got errors if using
AJ = randi(50,1,N);
EJ = randi(50,1,N);
if N is greater 200 and sometimes even if N is 100. Don't know why.
Stefan