How do I graph two trendlines on one graph?

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Robert Fehr 2015-3-18

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https://ww2.mathworks.cn/matlabcentral/answers/183742-how-do-i-graph-two-trendlines-on-one-graph

评论： Robert Fehr 2015-3-20

I can plot two data sets on graph, however when I go to add a trend line, I can only do so for one data set. I need to be able two add a trend line for both data sets. So my plot will have to data sets and two trendlines.

Thanks guys,

Bobby

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Michael Haderlein 2015-3-18

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Are you referring to some special tool or just to normal plotting? In the first case, which tool? In the second case, why are you not able to plot two trendlines? Here, I use smooth() as trendline:

x=linspace(0,10);
y1=(x+rand(size(x))).^2;
y2=(10-x+rand(size(x))).^2;
figure, plot(x,y1,x,y2)
sy1=smooth(y1);
sy2=smooth(y2);
hold all
plot(x,sy1,'k',x,sy2,'k')