converting XYZ file to GRID
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Hello all,
I am trying to convert a XYZ file, i.e.
X Y Z 1.5e3 2.8e6 2 2.5e3 3.8e6 2.1 . . .
into a grid, that would be several matrix for the X, Y and Z values
If I do it with my first file, it works, but if I try with the second one, it does not work properly the function unique creates more values than actually it has for the X and Y matrix, so when I create my Z matrix, there is no enough values...
load = XYZ ('points.xyz');
c=0;
x=unique(XYZ(:,1));
y=unique(XYZ(:,2));
[X,Y] = meshgrid(x,y);
for j=1:758
for i=1:3153
c=c+1;
Z(j,i)=XYZ(c,3);
end;
end;
Does someone know what is wrong? The files are: With this works: https://dl.dropboxusercontent.com/u/22755010/points%20working.dat
With this does not work: https://dl.dropboxusercontent.com/u/22755010/points%20no%20working.xyz Thanks in advance
Javier
0 Kommentare
Antworten (3)
Walter Roberson
am 14 Jun. 2013
2 Kommentare
Walter Roberson
am 16 Jun. 2013
if you are getting more values than you expect then possibly the problem is with values that look the same when displayed but are just slightly different. unique is going to notice the slight difference and treat them as different values.
Javier Abanades
am 17 Jun. 2013
3 Kommentare
Walter Roberson
am 18 Jun. 2013
At present, your 2e6 x 3 matrix is indexed at (point number, dimension number), where point number is 1 : number of points and the points are not ordered with respect to each other. Dimension number would be 1 for X, 2 for Y, 3 for Z.
After the transform, you want three 2D matrices, one each for X, Y, Z. But what are the indices for those 2D matrices? (1e3 by 2e3) would have the same number of entries as 1e6 x 1 would have, but what is the 1 : 1e3 intended to represent, and what is the 1 : 2e3 to represent?
Chad Greene
am 26 Apr. 2016
1 Kommentar
Mike Stin
am 21 Apr. 2020
Hello, I'm completely new here. I have XYZ data in an excelsheet or a text document and would like to edit this data with your script to create a 3d chart interface in Excel.
For this purpose the data must be available in mesh/grid form
However, I am not familiar with Matlab and could use some help.
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