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Plot of Quadratic Equation coming out Linear...What do I do??? Emergency

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Lauren
Lauren 2014-3-4
编辑： Roger Stafford 2014-3-4
Here is my plot code
clear all
x=[-10:1:10];
y1=-x+x.^2/(1+x.^2);
y2=-.5*x + x.^2/(1+x.^2);
y3=-.2*x+x.^2/(1+x.^2);
plot(x,y1,'r',x,y2,'b',x,y3,'g')
It should look like three different versions of a differential curve with increasing parameter values, but all three plots come out linear. Looks correct on another graphing site. What am I doing wrong?

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Roger Stafford
Roger Stafford 2014-3-4
编辑：Roger Stafford 2014-3-4
Try putting a dot on your division symbols:
y1=-x+x.^2./(1+x.^2);
As you have it the division is matlab's matrix division which in this case gives a scalar value, hence the linear appearance.
See
http://www.mathworks.com/help/matlab/ref/mrdivide.html

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