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fill comand (functions)

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felix jose chavez torres
回答： Star Strider 2017-9-4
how can i fill just this area in matlab? i need help.
  1 个评论
KSSV
KSSV 2017-9-4
provide the code which you have plotted this...

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Star Strider
Star Strider 2017-9-4
Try this:
x = linspace(-5, 5); % Define Indepenent Variable
upgoing_curve = x.^2; % Define First Curve
downgoing_curve = 5 - x.^2; % Define Second Curve
idx = (downgoing_curve > upgoing_curve) & (x >= 0); % Define Region-Of-Interest
figure(1)
plot(x, upgoing_curve, x, downgoing_curve, '-k');
hold on
patch([x(idx) fliplr(x(idx))], [upgoing_curve(idx) fliplr(downgoing_curve(idx))], 'g')
hold off
The patch call defines the independent variable and then flips it, and the dependent variables and flips the second one. The idea here is to create a closed curve, defined by ‘x(idx)’ and its ‘mirror image’, and the lower curve and the flipped version of the upper curve.

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