MATLAB Answers

Plotting the trend line without plotting the data

25 views (last 30 days)
Sophia on 8 Feb 2021
Answered: Chad Greene on 25 Mar 2021
I am trying to plot the trend line for three year data combined, So basically trend line on top the attached scatter plot.
% stack all three years to plot the trend line
msid_3yr = [icedrift_bg_2007;icedrift_bg_2015;icedrift_bg_2017];
wspd_3yr = [wspd_bg_2007;wspd_bg_2015;wspd_bg_2017];
%If i use the following it replaces the existing scatter plot colour dots
mdl = fitlm(wspd_3yr,msid_3yr,'linear')

Accepted Answer

KSSV on 8 Feb 2021
Edited: KSSV on 8 Feb 2021
REad about hold on. After plotting the first, use hold on. Alkso you may go ahead like below:
p = polyfit(wspd_3yr,msid_3yr,1)
xi = wspd_3yr ;
yi = polyval(p,wspd_3yr,msid_3yr) ;
hold on
Also when you use:
mdl = fitlm(wspd_3yr,msid_3yr,'linear') ;
mdl has coefficients of the line, you can use polval like shown above to plot.

More Answers (1)

Chad Greene
Chad Greene on 25 Mar 2021
Or more simply,
using the polyplot function found here.

Community Treasure Hunt

Find the treasures in MATLAB Central and discover how the community can help you!

Start Hunting!