Display only part of a plot?

Question

AWi 2018-7-18

0
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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/411006-display-only-part-of-a-plot

评论： AWi 2018-7-18

I have fitted a curve to a data set with the fit funtion, see code below. In my graph I have the data points as well as the fitted function and would like display the function only up to a certain x-value (red arrow in figure). So that the last four points are still displayed but without the function intersecting them. Is that somehow possible??

c1 =[0.1000;
0750;
0500;
0250;
0100;
0090;
0080;
0070;
0060;
0050;
0040;
0030;
0020;
0010;
0005;
0001;
00001;
000001;
       0]
d1=[46.5000;
4500;
5500;
9500;
0500;
6500;
9000;
0000;
0000;
9500;
3000;
1500;
5500;
1500;
1000;
4500;
1500;
9000;
2000]
f1 = fit(c1, d1, 'gauss3')
plot(f1, c1, d1)

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Answer 1

dpb 2018-7-18

1
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在 MATLAB Online 中打开

Yeah, but you have to evaluate the function over the range you want and use the results to do the plotting instead of the overloaded fit function-specific plot() routine--it doesn't have the option to not use the range of the data it was given for the prediction.

xhat=logspace(-6,-2);                 % 100 points log-spaced
yhat=f1(xhat);                        % evaluate at the points
semilogx(xhat,yhat,'r-',c1,d1,'b.')   % plot the fit over range and all data points