Store values generate in a function call in an array
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Nnamdi Chukwunenye
le 2 Sep 2020
Modifié(e) : Bruno Luong
le 3 Sep 2020
Hi I am trying to store the coordinates of the 4 spheres I am plotting from a function call. I can only return the final spheres coordinates instead of all of them. Any help would be greatly appreciated.
xyz = [-8.67212090030965 -7.78294481282592 4.19809966191787
4.30363429770975 -6.33796132936349 2.30412196271579
11.4626419696253 3.31049523749869 2.84193335035400
1.28757516363600 6.20802478748340 11.1358580308193];
x1 = xyz(:, 1);
y1 = xyz(:, 2);
z1 = xyz(:, 3);
SizeXYZ = size(xyz,1);
for i = 1:SizeXYZ
[x,y,z spheresXYZ] = createspheres(x1(i),y1(i),z1(i));
surf(x,y,z,'FaceColor', 'k');
hold on
end
%
function [X,Y,Z, spheresXYZ] =createspheres(spherex, spherey, spherez)
[x, y, z] = sphere(4);
X = x+spherex;
Y = y+spherey;
Z = z+spherez;
spheresXYZ = [X,Y,Z];
end
2 commentaires
Rik
le 2 Sep 2020
I'm not sure I understand what you mean. Could you provide an example of what you want as the output?
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Bruno Luong
le 2 Sep 2020
Modifié(e) : Bruno Luong
le 2 Sep 2020
spheresXYZ = cell(1,SizeXYZ);
for i = 1:SizeXYZ
[x,y,z spheresXYZ{i}] = createspheres(x1(i),y1(i),z1(i));
...
end
2 commentaires
Bruno Luong
le 3 Sep 2020
Modifié(e) : Bruno Luong
le 3 Sep 2020
If you prefer storage 3D array (assuming the function returns always a fixed size output) you can get them like this at the end of the loop
spheresXYZ = cell(1,SizeXYZ);
for i = 1:SizeXYZ
...
end
spheresXYZ = cat(3, spheresXYZ{:});
Then when needed, each sphere #k coordinates can be obtained by
spheresXYZ(:,:,k)
There is a whole bunch of techniques to preallocate nd array (see e.g. Rik's answer) that can be adapted for each case. This topic is beyond this thread.
Plus de réponses (1)
Rik
le 3 Sep 2020
Instead of using a cell array, you can also use a 3D matrix:
[~,~,~,spheresXYZ]=createspheres(0,0,0);spheresXYZ(1,1,SizeXYZ)=0;
for n = 1:SizeXYZ
[x,y,z,spheresXYZ(:,:,n)] = createspheres(x1(n),y1(n),z1(n));
end
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