[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]
## Re: Help Plotting Symbolic Vector Fields with Substitutions

**From**: |
WARDEVIL_UFO |

**Subject**: |
Re: Help Plotting Symbolic Vector Fields with Substitutions |

**Date**: |
Tue, 18 Apr 2017 18:23:35 -0700 (PDT) |

Hi Mike, and everyone! After some more hours of digging, and putting puzzle
pieces together, one by one, I was able to construct another way!It looks
like the key to converting a symbolic function to a form that is usable by
quiver3 is by using function_handle() or equivalently, matlabFunction(). My
corrected code is below:
clear
syms x y z
phi = atan2(y,x);
r = sqrt(x.^2+y.^2);
trans = [cos(phi), -sin(phi), 0; sin(phi), cos(phi), 0; phi.*0, 0, 1];
cyl = [z ./ r;r; r.^2.*z];
#cyl = [1 ./ r;0; 0];
rec = trans * cyl;
u = matlabFunction(rec(1,1));
v = matlabFunction(rec(2,1));
w = matlabFunction(rec(3,1));
[X,Y,Z] = meshgrid([-1:.5:1]);
figure
quiver3(X,Y,Z,u(X,Y,Z),v(X,Y,Z),w(X,Y,Z))
--
View this message in context:
http://octave.1599824.n4.nabble.com/Help-Plotting-Symbolic-Vector-Fields-with-Substitutions-tp4682904p4682912.html
Sent from the Octave - General mailing list archive at Nabble.com.

**Help Plotting Symbolic Vector Fields with Substitutions**, *WARDEVIL_UFO*, `2017/04/18`
**Re: Help Plotting Symbolic Vector Fields with Substitutions**, *Mike Miller*, `2017/04/18`
**Re: Help Plotting Symbolic Vector Fields with Substitutions**,
*WARDEVIL_UFO* **<=**
**Re: Help Plotting Symbolic Vector Fields with Substitutions**, *WARDEVIL_UFO*, `2017/04/18`
**Re: Help Plotting Symbolic Vector Fields with Substitutions**, *Colin Macdonald*, `2017/04/19`
**Re: Help Plotting Symbolic Vector Fields with Substitutions**, *WARDEVIL_UFO*, `2017/04/22`
**Re: Help Plotting Symbolic Vector Fields with Substitutions**, *Colin Macdonald*, `2017/04/24`
**Re: Help Plotting Symbolic Vector Fields with Substitutions**, *Colin Macdonald*, `2017/04/19`
**Re: Help Plotting Symbolic Vector Fields with Substitutions**, *WARDEVIL_UFO*, `2017/04/21`
**Re: Help Plotting Symbolic Vector Fields with Substitutions**, *Colin Macdonald*, `2017/04/21`
**Re: Help Plotting Symbolic Vector Fields with Substitutions**, *Colin Macdonald*, `2017/04/21`