Drawing Lines on a Graph
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I have two intersecting graphs plotted on the same axis,
ie: plot(V,P1,V,P2)
where P1 and P2 are variations of the same function
I would like to have a line drawn vertically to the x axis, and horizonally to the y axis from the point where these two lines intersect
How would I complete such a command?
Thanks
回答（2 个）
Mark Sherstan
2018-12-13
编辑：Mark Sherstan
2018-12-13
0 个投票
Star Strider
2018-12-13
If you do not have the Mapping Toolbox, this will likely work:
V = linspace(0, 30); % Arbitrary Vector
Pfcn = @(a,t) a(1).*exp(t/10) + a(2); % Arbitrary Function
P1 = Pfcn([ 4.2, -42],V); % Evaluate Function
P2 = Pfcn([-4.2, 4.2],V); % Evaluate Function
xint = interp1((P1-P2), V, 0); % Find ‘x’ At Intersection
yint = interp1(V,P1, xint); % Find ‘y’ At Intersection
figure
plot(V,P1,V,P2) % Plot Functions
hold on
xl = xlim;
yl = ylim;
plot(xint*[1 1], yl, 'g', xl, yint*[1 1],'g') % Plot Lines
hold off
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2018-12-13
2018-12-13
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