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how to fit a trend line in plotyy ?

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SONI SONI
SONI SONI 2015-3-2
回答： Image Analyst 2015-3-2
% code
y = [1:120]';
plotyy(y,data1,y,data2);
hold on
% plot(y,intercept + slope*y);
according to this code how can fit a trend line in data2

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采纳的回答

Brendan Hamm
Brendan Hamm 2015-3-2
编辑：Brendan Hamm 2015-3-2
You could use:
p = polyfit(y,data1,n); % looks like you want n=1 in your case
p contains the coefficients of the line:
fitLine = p(1)*y + p(2);
or equivalently:
fitLine = polyfit(p,y);

更多回答（1 个）

Image Analyst
Image Analyst 2015-3-2
See my attached polyfit demo.

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