Removing the origin from the 3D meshgrid?
4 Ansichten (letzte 30 Tage)
Ältere Kommentare anzeigen
Omar Azami
am 19 Feb. 2020
Beantwortet: darova
am 19 Feb. 2020
Suppose I want to plot level surfaces of a function of 3 variables, and suppose this function has a 1/(r^n) dependence. Where r = sqrt(X.^2 + Y.^2 + Z.^2) is the distance from the origin. Naturally I want to filter the origin from the [X,Y,Z] meshgrid to avoid singularities. How do I do this? Here is my attempt.
I thought about using the nonzero function on vectors x,y, and z and then forming the meshgrid but then that excludes entire coordinate planes.
%1) Create the grid
n = 50;
rmax = 2400;
x = linspace(-rmax,rmax,n+1);
y = linspace(-rmax,rmax,n+1);
z = linspace(-rmax,rmax,n+1);
[X,Y,Z] = meshgrid(x,y,z);
%2) Create R
R = sqrt(X.^2 + Y.^2 + Z.^2);
R1 = R.^(-1); %Create the reciprocal of R
idx = isnan(R1); %Find all the NaNs
R(idx) = []; %Delete all the NaN's in R, do the same for X,Y,Z
X(idx) = [];
Y(idx) = [];
Z(idx) = [];
Despite there being obvious singularities in R1 (because x,y,z each contain zero) I am still getting R,X,Y,and Z to have the same number of elements as they did before.
I would greatly appreciate any help.
0 Kommentare
Akzeptierte Antwort
Weitere Antworten (0)
Siehe auch
Kategorien
Mehr zu Surface and Mesh Plots finden Sie in Help Center und File Exchange
Community Treasure Hunt
Find the treasures in MATLAB Central and discover how the community can help you!
Start Hunting!