PDE toolbox, specifying coefficients, error telling me "Function specifying a coefficient must accept two input arguments and return one output argument."
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Hi all,
I keep running into the error while I am specifying f coefficient and the problem is I do not know why.
It would be very much appreciated if somebody kindly point me into the right direction. I have given my code below.
clc; tic; % Clears the screen
clear all;
e=0.5;
mu=0.00689;
V=265.988178;
omega=1047.197;
C=0.0000508;
R=0.508/2;
phi=45;
L=0.127;
%v=12*mu/h^3;
phi=45;
model = createpde();
rect1 = [3,
4,
-1,
1,
1,
-1,
0.3,
0.3,
-0.3,
-0.3];
r=decsg(rect1);
geometryFromEdges(model,r);
applyBoundaryCondition(model,'dirichlet','Edge',1:4,'u',1*10^5);
specifyCoefficients(model,'m',0,...
'd',0,...
'c',1,...
'a',0,...
'f',@fcoeffunction);
generateMesh(model,'Hmax',0.083);
results = solvepde(model);
p= results.NodalSolution;
function f = fcoeffunction(location,state)
N = 1; % Number of equations
nr = length(location.x); % Number of columns
f = zeros(1,nr); % Allocate f
dh=-e*cosd(phi)*sind(location.x+phi)+e*sind(phi)*cosd(location.x+phi);
dt=0.1*omega(e*cosd(phi)*cosd(location.x+phi)+e*sind(phi)*sind(location.x+phi);
o=location.y^2-(L^2/4);
h=C+e*cosd(location.x);
r=(omega*dh+2*dt);
f(1,:)=3*mu*r*o/h^3;
end
回答（1 个）
Ravi Kumar
2020-11-12
0 个投票
The function "fcoeffunction", does not have definitions of e, L, C, mu, r, o, etc. in its scope. Move the definitions in the begining to inside of this function. You can also put a breakpoint on the first line of the function and step through it to find all the missing variable definition.
Regards,
Ravi
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2020-11-12
2020-11-12
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