How can I change a certain part of a graph to a certain constant value?

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For example, this is a sine graph.
x = linspace(0,2*pi,100);
y = sin(x);
plot(x,y)
How to change the value of y to be y = sin(0.2*pi) at x = 0.2*pi to 0.8*pi? so that the graph appears to be sine graph, except it is a horizontal straight line from x = 0.2*pi to 0.8*pi.
Thank you in advance.

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Andrew Newell
Andrew Newell 2017년 4월 19일
편집: Andrew Newell 2017년 4월 19일
Here is one way:
y(x>=0.2*pi & x<=0.8*pi) = sin(0.2*pi);
Note that I use inequalities because there are no values of x that are exactly 0.2*pi or 0.8*pi.

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