Smooth out a surf plot

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Aaron
Aaron el 29 de Jun. de 2011
Editada: David el 30 de Jun. de 2025
I have created a surface plot of temperature data I have, all the x,y coordinates are integer values. I simply made a variable with my temperatures and used the surf command. This is what I have:
However that is way too 'chunky' for me to use. I need to prepare this for a presentation and I would like the graph to look more like this:
The second image is just one I grabbed off of google but that is what I am looking for.
Is there any way to generate an image like the second one from my data in MatLab? Or is there a way to make the image I already have into one like the second one using some imaging software?
Accuracy is important but it is secondary to appearance here. I really feel like this should be possible but if I'm asking for the moon here let me know, I have very little experience with MatLab. Thanks for any help!
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David
David el 30 de Jun. de 2025
Editada: David el 30 de Jun. de 2025
This is what I have:
However that is way too 'chunky' for me to use. I need to prepare this for a presentation and I would like the graph to look more like this:
You’re definitely not asking for the moon—this is totally doable in MATLAB! Try using interp2 to increase the resolution of your data grid before using surf, or switch to mesh with interpolated shading for a smoother look. Also, add shading interp to your plot—it’ll blend the colors and remove the “chunky” block effect. Should get you much closer to that second image!

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Sean de Wolski
Sean de Wolski el 29 de Jun. de 2011
Yes that's not difficult at all! Use interp2 to interpolate your surface to a finer grid.
doc interp2
Addendum
X = bsxfun(@(x,y)hypot((x-5),(y-5)),1:10,(1:10).'); %sample
subplot(121);
surf(X);
subplot(122);
[xx yy] = meshgrid(1:0.1:10); %force it to interpolate at every 10th pixel
surf(interp2(X,xx,yy))
grid off %turn off grid
  4 comentarios
Aaron
Aaron el 29 de Jun. de 2011
Thanks again, I've got everything worked out and I am satisfied with my result.
http://i1115.photobucket.com/albums/k545/RedK24/9-97surfaceplot.jpg
Peter Beringer
Peter Beringer el 22 de Nov. de 2020
This was really helpful, but I'm having trouble implementing it in an animated surf plot.
Should it go outside the 'for' loop (it's a 10 x 10 matrix of audio measurements with amplitude/time on z-axis) when I explicity create the figure, or does the interpolation need to be done with each new matrix of data drawn from measurement poisitions with each plot frame, that is, "in" the 'for' loop.
Thanks.

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