synartisi div se matlab

[CHRIS_MALL]

Gnwrizei kaneis pws ylopoieitai i entolh div se kwdika Matlab.??

Na epishmanw pws distyxws exw matlab 5.3

[Axelfc]

Σου αντιγραφω απο το help του Matlab. Υποθετω πως ψαχνεις για την divergence (δεν βρηκα κατι για div). Α, ψαξε μπας και βρεις το 6.1 τουλαχιστον. θα δεις τεραστια διαφορα απο το 5.3... Εκτος απο τις συναρτησεις που εχει επιπλεον το help του σου εξηγει σχεδον τελεια τα παντα.

 

divergence

Computes the divergence of a vector field

 

Syntax

div = divergence(X,Y,Z,U,V,W)

div = divergence(U,V,W)

div = divergence(X,Y,U,V)

div = divergence(U,V)

Description

div = divergence(X,Y,Z,U,V,W) computes the divergence of a 3-D vector field U,

V, W. The arrays X, Y, Z define the coordinates for U, V, W and must be monotonic

and 3-D plaid (as if produced by meshgrid).

 

div = divergence(U,V,W) assumes X, Y, and Z are determined by the expression:

 

[X Y Z] = meshgrid(1:n,1:m,1:p)

where [m,n,p] = size(U).

 

div = divergence(X,Y,U,V) computes the divergence of a 2-D vector field U, V. The

arrays X, Y define the coordinates for U, V and must be monotonic and 2-D plaid (as if

produced by meshgrid).

 

div = divergence(U,V) assumes X and Y are determined by the expression:

 

[X Y] = meshgrid(1:n,1:m)

where [m,n] = size(U).

 

Examples

This example displays the divergence of vector volume data as slice planes using color

to indicate divergence.

 

load wind

div = divergence(x,y,z,u,v,w);

slice(x,y,z,div,[90 134],[59],[0]);

shading interp

daspect([1 1 1])

camlight

[CHRIS_MALL]

Σου αντιγραφω απο το help του Matlab. Υποθετω πως ψαχνεις για την divergence (δεν βρηκα κατι για div). Α' date=' ψαξε μπας και βρεις το 6.1 τουλαχιστον. θα δεις τεραστια διαφορα απο το 5.3... Εκτος απο τις συναρτησεις που εχει επιπλεον το help του σου εξηγει σχεδον τελεια τα παντα.

 

divergence

Computes the divergence of a vector field

 

Syntax

div = divergence(X,Y,Z,U,V,W)

div = divergence(U,V,W)

div = divergence(X,Y,U,V)

div = divergence(U,V)

Description

div = divergence(X,Y,Z,U,V,W) computes the divergence of a 3-D vector field U,

V, W. The arrays X, Y, Z define the coordinates for U, V, W and must be monotonic

and 3-D plaid (as if produced by meshgrid).

 

div = divergence(U,V,W) assumes X, Y, and Z are determined by the expression:

 

[X Y Z'] = meshgrid(1:n,1:m,1:p)

where [m,n,p] = size(U).

 

div = divergence(X,Y,U,V) computes the divergence of a 2-D vector field U, V. The

arrays X, Y define the coordinates for U, V and must be monotonic and 2-D plaid (as if

produced by meshgrid).

 

div = divergence(U,V) assumes X and Y are determined by the expression:

 

[X Y] = meshgrid(1:n,1:m)

where [m,n] = size(U).

 

Examples

This example displays the divergence of vector volume data as slice planes using color

to indicate divergence.

 

load wind

div = divergence(x,y,z,u,v,w);

slice(x,y,z,div,[90 134],[59],[0]);

shading interp

daspect([1 1 1])

camlight

File mou ti vrika kai sto google afth th synartisi!Dystyxws den yparxei sto 5.3 par'olo pou yparxei i mod!!!

Mipws mporeis na mou ti steileis opws kai proigoumenws?

Se efxaristw kai pali!

[Axelfc]

Παρε και αυτη τη συναρτηση, αλλα να ξερεις πως πριν ησουν τυχερος που ειχε dependancies η προηγουμενη τα οποια υπαρχουν στο 5.3. Και στο google αμα ψαξεις για divergence.m πιστευω να την βρεις παντως...

 

>
function div=divergence(varargin)
%DIVERGENCE  Divergence of a vector field.
%   DIV = DIVERGENCE(X,Y,Z,U,V,W) computes the divergence of a 3-D
%   vector field U,V,W. The arrays X,Y,Z define the coordinates for
%   U,V,W and must be monotonic and 3-D plaid (as if produced by
%   MESHGRID).
%   
%   DIV = DIVERGENCE(U,V,W) assumes 
%         [X Y Z] = meshgrid(1:N, 1:M, 1:P) where [M,N,P]=SIZE(U). 
%
%   DIV = DIVERGENCE(X,Y,U,V) computes the divergence of a 2-D
%   vector field U,V. The arrays X,Y define the coordinates for U,V
%   and must be monotonic and 2-D plaid (as if produced by
%   MESHGRID). 
%   
%   DIV = DIVERGENCE(U,V) assumes 
%         [X Y] = meshgrid(1:N, 1:M) where [M,N]=SIZE(U). 
%   
%   Example:
%      load wind
%      div = divergence(x,y,z,u,v,w);
%      slice(x,y,z,div,[90 134],[59],[0]); shading interp
%      daspect([1 1 1])
%      camlight
%
%   See also STREAMTUBE, CURL, ISOSURFACE.

%   Copyright 1984-2001 The MathWorks, Inc. 
%   $Revision: 1.3 $  $Date: 2001/04/15 12:04:13 $


[x y z u v w] = parseargs(nargin,varargin);

% Take this out when other data types are handled
u = double(u);
v = double(v);
w = double(w);

if isempty(w)  % 2D

 [msg x y] = xyuvcheck(x,y,u,v);  error(msg)
 if isempty(x)
   [px junk] = gradient(u);
   [junk qy] = gradient(v);
 else
   hx = x(1,; 
   hy = y(:,1); 
   [px junk] = gradient(u, hx, hy);
   [junk qy] = gradient(v, hx, hy);
 end
 div = px+qy;
 
else   %3D
 
 [msg x y z] = xyzuvwcheck(x,y,z,u,v,w);  error(msg)
 if isempty(x)
   [px junk junk] = gradient(u);
   [junk qy junk] = gradient(v);
   [junk junk rz] = gradient(w);
 else
   hx = x(1,:,1); 
   hy = y(:,1,1); 
   hz = z(1,1,; 
   [px junk junk] = gradient(u, hx, hy, hz);
   [junk qy junk] = gradient(v, hx, hy, hz);
   [junk junk rz] = gradient(w, hx, hy, hz);
 end
 
 div = px+qy+rz;
 
end




%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
function [x, y, z, u, v, w] = parseargs(nin, vargin)

x = [];
y = [];
z = [];
u = [];
v = [];
w = [];

if nin==2         % divergence(u,v)
 u = vargin{1};
 v = vargin{2};
elseif nin==3     % divergence(u,v,w)
 u = vargin{1};
 v = vargin{2};
 w = vargin{3};
elseif nin==4     % divergence(x,y,u,v)
 x = vargin{1};
 y = vargin{2};
 u = vargin{3};
 v = vargin{4};
elseif nin==6     % divergence(x,y,z,u,v,w)
 x = vargin{1};
 y = vargin{2};
 z = vargin{3};
 u = vargin{4};
 v = vargin{5};
 w = vargin{6};
else
 error('Wrong number of input arguments.'); 
end

[alkisg]

Δοκίμασε με απλή διαίρεση και στρογγύλευση (αυτό μάλλον θα είναι κάτι σε round ή floor).