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Hi,
When i try to solve this:
x=(-200:-175:-150:-125:-100:-75:-50:-25:0:20:40:60:80:100)
f1=[5E-08 -3E-05 -0.0058 1.0479 177.56]
y1=polyval(f1,x)
plot(x,y1)
I says: 0x1 empty double row vector
It works with only positive numbers, how do i get it to work with the negative numbers?

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