How to plot a surface in Matlab?

2016 9 28
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更新时间：2016 9 28
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I would like to plot a surface in matlab; however, matlab is assigning each element of the matrix to an intersection of the meshgrid. I want each element of my matrix to be the value of each square in the meshgrid, not at the intersections. The result of this problem is that I am 'missing' a row/column on one end of my surface plot due to the color mapping. Using the data cursor I can confirm that the values are there, except on the intersections of the grid lines; hence the edges are effectively missing a row/column visually. I want a 3D equivalent of imagesc. Any ideas?

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Massimo Zanetti
Massimo Zanetti 2016-9-28
A square has 4 vertex.. So you cannot assign one value to a square.
Cankut Eker
Cankut Eker 2016-9-28
So there is no way to center the values onto the squares? Is there a way to shift the meshgrid so that it seems like the intersections are in the middle of the squares?
KSSV
KSSV 2016-9-28
How about assigning all four values same to each vertex?
Cankut Eker
Cankut Eker 2016-9-28
That's a good idea, but I think there may be a discontinuity in some row or column at the end since there will inevitably be 2 corners=x and the other 2 corners=y.
KSSV
KSSV 2016-9-28
Have you tried shading interp after plotting the surface?
Cankut Eker
Cankut Eker 2016-9-28
Thank you so much! It worked! Is there anyway to put the surface lines on?
Cankut Eker
Cankut Eker 2016-9-28
Nevermind figured it out. Thank you very much everyone!

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José-Luis
José-Luis 2016-9-28

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You could use image() instead.

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Cankut Eker
Cankut Eker 2016-9-28
Image does work to fix this problem, but it still only generates a 2D plot, unless i'm missing something. Thanks for the suggestion though!
José-Luis
José-Luis 2016-9-28
In that case I think you need to interpolate first and then use surf() and variants.
Cankut Eker
Cankut Eker 2016-9-28
I think this would have also solved it so I am going accept this as an answer, including the line 'shading interp' solved it. I just need to find a way to put the lines back into the surface plot :)
Cankut Eker
Cankut Eker 2016-9-28
The property 'edgecolor','k' did the trick ;)

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