Error in Bvp4c
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I'm trying to run the following bvp4c MATLAB code, but keep running into an error:
please anyone find out my mistakes and correct me..
Thank you.
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Accepted Answer
Jan
on 23 Oct 2021
You define the variable beta on top of the code, but this does not mean, that it is known in all subfunctions. Pr, gamma and lam are not known inside also.
Either define the constants, where they are needed, or provide them using an anonymous function:
for gamma=0.0:0.25:1
sol = bvpinit(linspace(0,5,50),[0 0 0 0 0 0 0]);
fcn = @(t,y) bvpexam1(t, y, beta, gamma, lam, Pr);
sol1 = bvp4c(fcn, @bcexam1,sol);
...
end
function ysol = bvpexam1(t, y, beta, gamma, lam, Pr)
...
end
More Answers (1)
MOSLI KARIM
on 27 Nov 2023
this code works function d
Pr=0.72;
beta=0.5;
lam=0.2;
E=0.5;
for gamma=0.0:0.25:1
sol = bvpinit(linspace(0,5,50),[0 0 0 0 0 0 0]);
sol1 = bvp4c(@bvpexam1, @bcexam1,sol);
x1 = sol1.x;
y1 = sol1.y;
figure (1)
plot(x1, y1(2,:));
hold on
figure (2)
plot(x1, y1(6,:));
hold on
z = y1(3,1);
p = y1(7,1)'
figure(3)
plot(gamma,y1(7,1),'-bo')
hold on
end
function res = bcexam1(y0, yinf)
res=[y0(1)-0;y0(2)-1;y0(4)-0;y0(6)-1;yinf(2)-0;yinf(4)-0;yinf(6)-0];
end
function ysol = bvpexam1(~,y)
yy1 = (1/(1-beta*y(1)^2))*(-y(1)*y(3)+y(2)^2-2*lam*(y(4)-beta*y(1)*y(5))-2*beta*y(1)*y(2)*y(3));
yy2 = (1/(1-beta*y(1)^2))*(-y(1)*y(5)+y(2)*y(4)+2*lam*(y(2)+beta*(y(2)^2-y(1)*y(3)+y(4)))-2*beta*y(1)*y(2)*y(5));
yy3 = (1/(1+E*y(6)-Pr*gamma*y(1)^2))*(-E*y(7)^2-Pr*y(1)*y(7)+Pr*gamma*y(1)*y(2)*y(7));
ysol = [y(2);y(3);yy1;y(5);yy2;y(7);yy3];
end
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