how to export of a sub aera of an array to xyz?

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Harald von der Osten 2022-5-28

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https://ww2.mathworks.cn/matlabcentral/answers/1728780-how-to-export-of-a-sub-aera-of-an-array-to-xyz

评论： Harald von der Osten 2022-5-28

if I use:

F = scatteredInterpolant(x,y,z,'natural','none');
xv=linspace(min(x,[],'all'),max(x,[],'all'),(max(x)-min(x))/faktor);
yv=linspace(min(y,[],'all'),max(y,[],'all'),(max(y)-min(y))/faktor);
zg = F({xv,yv});

and want to export an area of this array:

A=xv(1600:1:2000);
B=yv(400:1:800);
C = F({A,B});

to an xyz file....how can I manage this?

This:

fid = fopen('vdo.txt','w') ; 
fprintf(fid,'%f %f %f\n', A', B', C') ;
fclose(fid) ; 

or that

xx = A(:) ; 
yy = B(:) ; 
zz = C(:) ; 
P = [xx yy zz] ;
fid = fopen('cut.dat', 'wt');
fprintf(fid, [repmat('%f\t', 1, size(P,2)-1) '%f\n'],P.');
fclose(fid)

doesn't work...

Thanks a lot

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采纳的回答

KSSV 2022-5-28

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1728780-how-to-export-of-a-sub-aera-of-an-array-to-xyz#answer_973170

编辑：KSSV 2022-5-28

xx = A(:) ; 
yy = B(:) ; 
zz = C(:) ; 
P = [xx yy zz] ;
fid = fopen('test.txt','w')
fprintf(fid,'%f %f %f\n', P.') ;
fclose(fid)

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KSSV 2022-5-28

In that case, obviously you will get error. Becuase your xx,yy is 401*1 and zz is 160801*1; which you cannot merge into a column matrix. Try this:

[A,B] = meshgrid(A,B) ; 
xx = A(:) ; 
yy = B(:) ; 
zz = C(:) ; 
P = [xx yy zz] ;
fid = fopen('test.txt','w')
fprintf(fid,'%f %f %f\n', P.') ;
fclose(fid)