Error :First input argument must be a function handle

I am getting "First input argument must be a function handle."

%%Qsh=00;

L=100; W=100; %%Tox = 38.2*10^-9;

Er=16;

u=7000;%% cm2/v.s

e=04;%%%%%%%5Find out!!!!!!!!

Nf=10;%% cm2

R = 280;%% R = Rs/Rd;

hw = 56*10^-3*e;%% NOT SURE !!!!!!!!!!!!

Delta = 66.8*10^-3*e;%% NOT SURE !!!!!!!!!!!!

Pi = 3.14159265;

h=0;%%%%%%%5Find out!!!!!!!!

vf=02;0;%%%%%%%5Find out!!!!!!!!

B = 4;%%% Find OUt!!!!!!!!!!!

Ctop=05;%%%%%%%5Find out!!!!!!!!

w=01;%%5 Find Out !!!!!!!

%%For Loop

Vgsi = 5;

Vdsi=2;

V=Vdsi/2;

b=2;

%% Equation 3

s = sign(Ctop*(Vgsi-V) +e*Nf)

%% Equation 2

Vch = (s-Ctop+sqrt(Ctop^2+4*B*abs(Ctop*(Vgsi-V))+e*Nf))/(2*B)

%% Equation 1

Qsh = e*((-B/e)*abs(Vch)*Vch+Nf)

%% Equation 4

Qnetav = b*s*((-Ctop^2+sqrt(Ctop^2+4*B*abs(Ctop*(Vgsi-Vdsi/2)+e*Nf))/(2*B))^2)

%% Equation 5 for Npuddle

Npuddle = Delta^2/(pi*h^2*vf^2);

%% Equation 5 for Vsat

Vsatav = L+abs(Vdsi)*u*(pi*((abs(Qnetav)/e)+Npuddle))^0.5/w;

%% Equation 5

Id = u*W*integral(abs(Qnetav)+e*Npuddle,0,Vdsi)/(L+u*abs(integral((1/Vsatav),0,Vdsi)));

% Plot(Vgsi,Id)

Please help.

Thanks

Answer 1

[Walter Roberson]

Id = u*W*integral(@(Qnetav) abs(Qnetav)+e*Npuddle,0,Vdsi) / (L+u*abs(integral(@(Vsatav) (1/Vsatav),0,Vdsi)));

Assuming, that is, that you want to integrate over Qnetav and Vsatav and that e and Npuddle are already defined.

However, remember integral(1/x,x=a..b) is ln(b)-ln(a) and when a = 0 the result is infinite, so your second integral is infinite if you are integrating over Vsatav . If you are integrating over some other variable then you would be integrating a constant and the result would be Vdsi/Vsatav with no need to integrate. Either way, there is no point in doing the second integral -- it is either infinite or a constant.