Re: can matlab plot data by condition

Thank you for your answer, but this method seems plot dot by
dot, in my test, it performs slower than mine, but thanks
anyway.

adinda <adinda.vandenberg@xxxxxxxxx> wrote in message
<1193824563.494029.291520@xxxxxxxxxxxxxxxxxxxxxxxxxxx>...
On 31 okt, 07:47, "Ha Wanger"
<virtualcyberinfo+nos...@xxxxxxxxx>
wrote:
I have two matrix like these:
X = [1 2 3 4 5 6]
Y = [-3 -1 -2 2 -1 1]

I want to have a line-dot plot and when Y<0, the dot is red;
when Y>0, the dot is blue.

Now I'm using the follwing method:
1. creat two matrixs foo1 & foo2 from [X;Y]
foo1 = [1 2 3 5 ; -3 -1 -2 -1]
foo2 = [4 6 ; 2 1]
2. plot(foo1(1,:),foo1(2:,),'.r')
plot(foo2(1,:),foo2(2:,),'.b')
plot(X,Y,'-')

actually,the matrixs X & Y are very big so this method is
some inefficient.

Can anyone give me a better method? Thanks!

Probably there are better ways than this, but hey (X and Y
are vectors
right?)

for k=1:length(Y)
if Y(k)>0
plot(X(k),Y(k),'b'), hold on
else plot(X(k),Y(k),'r'), hold on
end
end
hold off


.

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