How can I label the same line using different color

2012 9 11

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Hi, everyone,

I want describe the same line by different colors, for exaple,

a=0:0.01:2*pi; b=sin(a); plot(a,b,'r')

however, how to make the sine line red when its value is more than zero while

black if its value is less than zero.

Thanks.

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Matt Fig 2012-9-11

编辑：Matt Fig 2012-9-11

0 个投票

One way to get the effect is to use two lines.

a = 0:0.01:2*pi; 
b = sin(a);
b2 = b;
b(b<=0) = nan;  % nan values are not plotted.
b2(b2>=0) = nan;
plot(a,b,'r',a,b2,'k')

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