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add lsline or trend line to log-log graph
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i want to draw a least square line to log-log plot i am using following scripy
wet=[120 49 30 21 12 10 9 7 4];
dry=[49 12 5 1 1 1 0 0 0 ];
x1=[1 2 3 4 5 6 7 8 9];
scatter(x1,wet);
set(gca,'XScale','log');
set(gca,'YScale','log');
lsline
but it is not working. is their any other way to draw a line which is straight pass through the points
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Accepted Answer
Star Strider
on 8 Mar 2015
This works:
wet=[120 49 30 21 12 10 9 7 4];
dry=[49 12 5 1 1 1 0 0 0 ];
x1=[1 2 3 4 5 6 7 8 9];
scatter(x1,wet);
set(gca,'XScale','log');
set(gca,'YScale','log');
b = polyfit(log(x1), log(wet), 1);
wetfit = exp(b(2)) .* x1.^b(1);
hold on
plot(x1, wetfit)
hold off
producing:
![](https://www.mathworks.com/matlabcentral/answers/uploaded_files/173736/image.png)
12 Comments
Star Strider
on 14 Mar 2015
The code in the FEX contribution seems to use the same algorithm mine does for R-squared. Mine uses the nonlinear fit and the OLSCF (Ordinary Least Squares Cost Function) to generate the ‘norm(Y-X)’ data.
I didn’t run the FEX submission, but I trust my code.
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