discontinuity missing.

2011 4 18
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Hello
This might seem a really easy question for some of you but I can't fix it.
I need to create a function M-file for the function
f(x) = 1-x if 0<=x<=1 [1] and
f(x) = -1-x if -1<=x<0 [2]
I've tried to do this with
if (x >= 0) & (x <= 1) % x is [1]
y = +1 -x;
else
y = -1 -x; % x is [2] or outside of the domain (y doesn't matter so it can be -1-x
end
However when I try to plot this function it remains just one straight line y=-1-x It is probably something really obvious that I'm missing here but I'm not really experienced with matlab.

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Paulo Silva
Paulo Silva 2011-4-18

1 个投票

Connected lines
x=-1:0.01:1;
y(x>=-1 & x<0)=-1-x(x>=-1 & x<0);
y(x>=0 & x<=1)=1-x(x>=0 & x<=1);
plot(x,y)
Alternative, not connected lines
x1=-1:0.01:0-0.01;
x2=0:0.01:1;
y1(x1>=-1 & x1<0)=-1-x1(x1>=-1 & x1<0);
y2(x2>=0 & x2<=1)=1-x2(x2>=0 & x2<=1);
plot(x1,y1)
hold on
plot(x2,y2,'r')

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