a function just valid over a certain range
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Hello everyone, let me ask
a formula is expressed mathematically as follows
Y = x^2 + 3x + 1 , for 2<x<8;
Y = 0 for else (x<2 or x>8)
then I would plot Y value for Y within 0<x<10.
in excel I succeeded by writing the following formula
=IF(AND(x >= 2, x<=8), x^2+3x+1, 0)
with similar logic, I write this in Matlab
x = 0:0.1:10 ;
if 2 <= x <= 8
y = x.^2+3.*x+1 ;
else
y = 0
end
plot(x,y)
please see the graph above, which for the value of Y at x < 2 is not 0
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The simple MATLAB approach is to use logical indexing:
x = 0:0.1:10;
y = x.^2+3.*x+1;
y(x<2 | x>8) = 0;
plot(x,y)
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