trend line not drawing in sub-plot

Question

nori 2012-4-24

0
链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/36425-trend-line-not-drawing-in-sub-plot

Hello,

I have this really strange issue going and it is really confusing me. I am trying to plot a trend line through a set of data and I can do it just fine in a regular plot, but as soon as I add it to a sub-plot, I can get either the data or the trend line and not both.

I did try to do it with the toolbox but in a subplot figure, I can only get 1 trend line to show up on any of my 5 subplots at a given time. so both methods are 'either or' and not both :(

any help would be greatly appreciated. thanx.

here is my code i am testing with.

a = [1 2 3 4 5]';
b = [3 7 9 3 7]';
figure
hold all
plot (a,b);
% plot trend line
f = fittype('a*x+b'); %define fittype
fitobj = fit(a,b,f); %fit line to data
plot (fitobj,'k') %plot trend line
figure
subplot(2,1,1)
plot (a,b);
% plot trend line
f = fittype('a*x+b'); %define fittype
fitobj = fit(a,b,f); %fit line to data
plot (fitobj,'k') %plot trend line

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Answer 1

Sean de Wolski 2012-4-24

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https://ww2.mathworks.cn/matlabcentral/answers/36425-trend-line-not-drawing-in-sub-plot#answer_45566

在 MATLAB Online 中打开

You need to hold on to your subplot!

figure
subplot(2,1,1)
hold on
plot (a,b);
% plot trend line
f = fittype('a*x+b'); %define fittype
fitobj = fit(a,b,f); %fit line to data
plot (fitobj,'k') %plot trend line