How to combine two trendlines from two different plot?

Question

Okinawa Rikenata 2018-2-6

0
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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/381069-how-to-combine-two-trendlines-from-two-different-plot

编辑： Birdman 2018-2-6

I have array data. Let's say time, x, and y. They are all 117*1 array. Then i make plots. And then i add a trendline for each plot using polyfit.

aa=polyfit(time,x,1);
bb=polyval(aa,time);
figure
plot(time,x)
hold on 
plot(time,bb)
cc=polyfit(time,y,1);
dd=polyval(cc,time);
figure
plot(time,y)
hold on
plot(time,dd)

So then i have 2 figures with 2 trendlines. I have a trouble about how to combine these two trendline in one figure. So that i can calculate the angle between the trendlines. Thank you..

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Answer 1

Birdman 2018-2-6

0
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/381069-how-to-combine-two-trendlines-from-two-different-plot#answer_303693

编辑：Birdman 2018-2-6

在 MATLAB Online 中打开

One figure definition is enough.

aa=polyfit(time,x,1);
bb=polyval(aa,time);
figure
plot(time,x)
hold on 
plot(time,bb)
cc=polyfit(time,y,1);
dd=polyval(cc,time);
plot(time,y)
plot(time,dd)