Plot xyz point data to 3D contour

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Amra Rajuli
Amra Rajuli 2021-3-28
评论： Star Strider 2021-4-12
How to plot the xyz point data (attached) into 3D contour? Thank you

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Star Strider
Star Strider 2021-3-28
Try this:
D = readmatrix('data.txt');
x = D(~(any(isnan(D),2)),1);
y = D(~(any(isnan(D),2)),2);
z = D(~(any(isnan(D),2)),3);
N = 50;
xv = linspace(min(x), max(x), N);
yv = linspace(min(y), max(y), N);
[X,Y] = ndgrid(xv, yv);
Z = griddata(x, y, z, X, Y);
figure
surf(X, Y, Z)
.
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Amra Rajuli
Amra Rajuli 2021-4-12
what if the input is shape file. your code would be:
D = shaperead('Cross_9_Agustus_2020_A1.shp')
x = D.X(~(any(isnan(D),2)),4);!starting error
y = D.Y(~(any(isnan(D),2)),5);
z = D.Z(~(any(isnan(D),2)),6);
N = 100;
xv = linspace(min(x), max(x), N);
yv = linspace(min(y), max(y), N);
[X,Y] = ndgrid(xv, yv);
Z = griddata(x, y, z, X, Y);
figure
contour(X, Y, Z,10);
however, it was written in error part that:
Undefined function 'isnan' for input arguments of type 'struct'.
do you familiar with that problem? Thank you in advance
Star Strider
Star Strider 2021-4-12
The shaperead function requires the Mapping Toolbox, that I do not have.
I cannot run your code.
However, removing the NaN values from the structure would likely be straightforward:
Dnonan = structfun(@(x)x(~(any(isnan(x),2))),D, 'Unif',0);
x = Dnonan.X;
y = Dnonan.Y;
z = Dnonan.Z;
See if that does what you want. (It worked with a random structure I created to test this, with the fields of ‘D’ being column vectors.)
Make appropriate changes to get thee result you want.

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