Increasing number of points in a plot without ruining the shape

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Abhiraj Gupta
Abhiraj Gupta on 20 Aug 2019
Answered: darova on 20 Aug 2019
How can I make this plot look like
this plot but instead of reducing points I want to increase data points in red plot to 20. Using linspace or interp1 is giving me a straight line. I want to conserve the shape of the plot and increase the number of points in the plot.

Accepted Answer

darova
darova on 20 Aug 2019
Is it correct? (Not tested)
x1red = linspace(xred(1),xblue(end),20); % more points for red curve
% scaling red curve (make it as long as blue one)
Lred = xred(end) - xred(1);
Lblue= xblue(end) = xblue(1);
xred_scaled = xred(1) + (xred-xred(1))*Lblue/Lred;
y1red = interp1(x_red_scaled,yred,x1red);
plot(xblue,yblue,'b')
hold on
plot(x1red,y1red,'r')
hold off

More Answers (1)

Stephen23
Stephen23 on 20 Aug 2019
Edited: Stephen23 on 20 Aug 2019
Try using method spline or pchip and see if they do what you want:
interp1(...,'pchip')
  1 Comment
Stephen23
Stephen23 on 20 Aug 2019
Writing "it's not working" tells us nothing. If you want further help then please:
  • tell us if you are extrapolating the data.
  • show the exact code that you are using.
  • upload sample data in a .mat file.
  • show or explain how the expected output is different to what you get.

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