how to elongate parabola? I have plot parabola using 3 points and now i want elongation without changing points.

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sushant panhale 2017-9-29

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https://ww2.mathworks.cn/matlabcentral/answers/359040-how-to-elongate-parabola-i-have-plot-parabola-using-3-points-and-now-i-want-elongation-without-chan

评论： sushant panhale 2017-10-17

 x1=[1,50];
 x2=[50,5];
 x3=[100,50];
Y=[x1(2);x2(2);x3(2)]
A=[x1(1)^2 x1(1) 1;x2(1)^2 x2(1) 1;x3(1)^2 x3(1) 1]
X=(inv(A))*Y;
x=x1(1):1:x3(1);
Y=(X(1)*(x.^2))+(X(2)*x)+X(3);
figure();
plot(Depth1);
hold on
para=plot(x,Y);
grid on 
hold on
text(x1(1),x1(2), ' POINT X1')
text(x2(1),x2(2), ' POINT X2')
text(x3(1),x3(2), ' POINT X3')
hold off

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James Tursa 2017-9-29

Elongate in what way? Are you trying to stretch the parabola vertically or horizontally? Or ...?

sushant panhale 2017-10-17

Thanks for your reply. I wanted to stretch it vertically. I have found the way to stretch it vertically but if know how to do it better way please share your logic for other students.

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