how can I plot a vector 'g+' under a f(x) and 'r+' over f(x)

I need to plot f(x)=x^3 and I also have a big vector that I have to plot in the same figure, but I need to plot everything in the vector red that is over the function f(x) and green if the element is under the function f(x). I know that vector./f is over the line if greater than 1 and under the line if smaller than 1. I have tried for lops but nothing works. What should I do?

Answer 1

[dpb]

y=f(x);
plot(x,y)
hold on
ix=v>y;   % vector>f(x) logical array
plot(x( ix),v( ix),'color','r')
plot(x(~ix),v(~ix),'color','g')

[Frida]

Thank you :) it worked :D

[dpb]

Of course it did... :)

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