fplot fails to produce a graph

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Henning Søgaard 2016-9-22

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/304059-fplot-fails-to-produce-a-graph

评论： Karan Gill 2016-10-25

The first fplot in the following code doesn't produce a graph (only a coordinate system) while the second fplot does. Why? (MATLAB R2016a; Windows 7 Enterprise)

r = 50; L = 110; h = 40;
th = @(t) 80*(t+exp(-t)-1);
y = @(t) r*sin(th(t)) + sqrt(L^2-(r*cos(th(t))).^2) + h;
f = @(t) y(t) - 195;
fplot(y,[0 2])
figure
fplot(f,[0 2])

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Walter Roberson 2016-10-23

I just tested in R2016b on OS-X, and in R2016b on Windows 10, and the fplot does work now.

Karan Gill 2016-10-25

A public bug report exists: http://www.mathworks.com/support/bugreports/1383817. As a workaround, it states: "You might be able to work around this behavior by tweaking the x-axis range. For example, try fplot(@f,[2 3.1]) instead of fplot(@f,[2 3]). Otherwise, set the axis range using the axis function, for example, axis([0 2 -5 5]) (i.e., [xmin xmax ymin ymax])."

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回答（1 个）

Mudambi Srivatsa 2016-9-26

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/304059-fplot-fails-to-produce-a-graph#answer_236228

This is a bug in MATLAB R2016a and it is resolved in MATLAB R2016b. You can upgrade to R2016b to resolve the issue or use "ezplot" as a workaround in R2016a.