Conditional statements with FPLOT

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Natalia Kovaleva
Natalia Kovaleva 2017-3-6
编辑： Natalia Kovaleva 2017-3-6
How can I plot a function with regions in different colours based on if conditions using fplot?
In other words, let's say I have a function z(x) and q(x), I would like to plot z(x) in blue when condition on q(x) is satisfied, and in red otherwise. I was thinking of the following pseudocode (my functions are much more involving than sine and cosine):
z= @(x) sin(x);
y= @(x) cos(x);
if y<0 && z>0
fplot(@(x) sin(x), 'r');
hold on
else
fplot(@(x) sin(x), 'b');

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