How do I plot piecewise defined functions in different colours.

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bless Tsikaz
bless Tsikaz 2017-8-8
评论： bless Tsikaz 2017-8-8
Good day
I want to write a program to plot piecewise defined functions on the same graph in different colour.The functions are:
F(x)=0.5X if X<=100 ; 50 +0.2(x-1000) if 100<x<=200 ; 75+0.5x if x>200
On same graph with
G(X)= 0.01X IF X<=75 ; 50+0.1(X-75) IF x>75
Note these may not be actual figures.Just for illustrative purposes.
Thanks.
  1 个评论
Adam
Adam 2017-8-8
编辑：Adam 2017-8-8
You'd have to just define each piece as its own plot and give them the colour you want. You can't multicolour a single plot object.
doc hold
shows how to keep existing plots on an axes when you add a new one.

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回答（1 个）

José-Luis
José-Luis 2017-8-8
编辑：José-Luis 2017-8-8
myFun = @(x) ((x<=100).*(0.5 .* x)) + ((x>100 & x<=200) .* (50+0.2.*(x-1000))) + ((x>200).*(75+(0.5.* x)));
fplot(myFun,[0, 300],'Color',rand(1,3));
Same principle can be applied for g(x).
Don't forget to hold on

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