How to surface or mesh plot imported data?
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Hi!
I am new to matlab and could not find answer to how to import data organised like a matrix with a space as delimiter. It looks like this
x1 y1 z11
x1 y2 z12
x1 y3 z13 .... (etc)
until the last row
xn y1 zn1
xn y2 zn2
...
xn yn znn
I would like to have the x and y coordinates in the plane and the z coordinates as the height above the plane, either in a surf or a mesh plot, but all tutorials and help articles I find are for excel or use code that throws errors when I try to use them.
All help is appreciated! Thanks! :-)
采纳的回答
Star Strider
2023-9-21
0 个投票
‘... I need some commands that instructs MatLab that VarName1 and VarName2 are x and y respectively, while VarName3 is the z-coordinate.’
Perhaps something like this —
testout = readtable('YourExcelFile.xlsx')
testout.Properties.VariableNames = {'x','y','z'};
X = reshape(testout.x, 21,[]);
Y = reshape(testout.y, 21,[]);
Z = reshape(testout.z, 21,[]);
figure
plot(X, Y, Z)
xlabel('X')
ylabel('Y)
zlabel('Z')
Make appropriate changes to work with your file and data.
.
2 个评论
Daniel Bozi
2023-9-21
Star Strider
2023-9-21
As always, my pleasure!
My using plot instead of surf was an oversight. My apologies! (I need to proofread my code here before posting it.)
更多回答（1 个）
KSSV
2023-9-21
0 个投票
Refer this link: https://in.mathworks.com/matlabcentral/answers/412639-creating-surface-plot-from-a-matrix-with-3-columns?s_tid=srchtitle
If you have more doubts..attach your file.
3 个评论
Daniel Bozi
2023-9-21
Thank you! My problem is that the data file is quite large (several hundred rows), so I need some commands that instructs MatLab that VarName1 and VarName2 are x and y respectively, while VarName3 is the z-coordinate. The surface and mesh plot options are not available since MatLab does not recognise the x and y columns as coordinates, and VarName3 as entries in a matrix.
Here is what the start of the file looks like:
Daniel Bozi
2023-9-21
KSSV
2023-9-21
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