MATLAB: Quadgk errors: Supported classes are ‘double’ and ‘single’

Question

Hi all,

Could somebody be so kind to help me with quadgk errors as following:

> > ??? Error using ==>quadgk/finalInputChecks (line 447) > > Supported classes are 'double' and 'single'.

 > > > Error in ==> quadgk/evalFun (line 331) finalInputChecks(x,fx);

> > > quadgk/f1 (line 348) [y,too_close] = evalFun(tt);

> > > Error in ==> quadgk/vadapt (line 249) [fx,too_close] = f(x);

> > > quadgk (line 188) [q,errbnd] = vadapt(@f1,interval);

Here are the codes:

clear all

syms z

kB=1.38e-23;

Eg=2.18.*(1.6e-19);

T=300;

TkB =4.14e-21;

hbar=1.055e-34;

me=9.11e-31; mestar=0.21.*me; N=0; EF=-3*(1.6e-19);

no=4e26;

Delta=inf;

kWN= hbar^(-1).*sqrt(me.*(Eg.*me+ Eg.*mestar-sqrt(Eg.^2.*me.^2+2*Eg.^2.*me.*mestar+Eg.^2.*mestar.^2+4*TkB.*z.*Eg.*me.*mestar)+2*TkB.*mestar.*z)./mestar);

FF=@(z)(kWN.^3).*exp(z-EF./TkB).*(exp(z-EF./TkB)+1).^(-2)

while Delta>=0.005 & N<=100

EF=(-2+0.1*N)*(1.6e-19)

nn=quadgk(FF,0,inf)

n=(1/(3*pi.^2)).*nn

N=N+1

Delta=abs((n-no)/no)

end

EF=EF/(1.6e-19)

if N>=50

    disp('More than 100 terms are needed')

else

    fprintf('Fermi level is: %eV',EF)

end

Answer 1

kB=1.38e-23;
Eg=2.18.*(1.6e-19);
T=300;
TkB =4.14e-21;
hbar=1.055e-34;
me=9.11e-31; 
mestar=0.21.*me; 
N=0; 
EF=-3*(1.6e-19);
no=4e26;
Delta=inf;
kWN= @(z)hbar^(-1).*sqrt(me.*(Eg.*me+ Eg.*mestar-sqrt(Eg.^2.*me.^2+2*Eg.^2.*me.*mestar+Eg.^2.*mestar.^2+4*TkB.*z.*Eg.*me.*mestar)+2*TkB.*mestar.*z)./mestar);
while Delta>=0.005 & N<=100
EF=(-2+0.1*N)*(1.6e-19)
FF=@(z)(kWN(z).^3).*exp(z-EF./TkB).*(exp(z-EF./TkB)+1).^(-2)
nn=quadgk(FF,0,inf)
n=(1/(3*pi.^2)).*nn
N=N+1
Delta=abs((n-no)/no)
end

Best wishes

Torsten.