Zeroes on an equations with a variable of a specific range

1 view (last 30 days)
I'm trying to find zeroes for a specific function but I keep on getting this error message:
"Error using fzero (line 428)
Second argument must be a scalar or vector of length 2.
Error in Problem3b (line 14)
x=fzero(fun,E)"
My current set up looks as such:
m=9.11*10^-31;
hbar=1.055*10^-34;
e=1.602*10^-19;
Vo=(1.42-0.354)*e;
L1=(4*10^-9);
L2=(10*10^-9);
m1=0.067;
m2=0.025;
meff=((2*m1*m*L1)+(m2*m*L2))/(2*L1+L2);
range=linspace(0,Vo,10^6);
E=linspace(0,Vo,200);
k=(sqrt(2.*meff.*E))./hbar;
B=(sqrt(2.*meff.*(Vo-E)))./hbar;
fun=@(E) ((sqrt(2.*E.*(Vo-E)))/(2.*E-Vo))-(tan(k.*L2).*tan(h.*B.*L1));
x=fzero(fun,E)
  2 Comments
Jan
Jan on 13 Nov 2016
The error message is clear. Read the documentation of fzero and explain, why you provide a 1x200 vector instead of the required value. Guessing your intention is not efficient.
Fuad Alami
Fuad Alami on 13 Nov 2016
Yeah, I don't really code so I have no idea where to start with what. Got throwen into a 4th year phys-eng class with no prior matlab experience....

Sign in to comment.

Answers (1)

Yeshwanth Devara
Yeshwanth Devara on 16 Nov 2016
As Jan suggested, the second argument expects a real scalar or a 2-element real vector. It appears the second argument in your case is a 1x200 vector. Refer to the documentation for more information on fzero function and its input arguments.

Categories

Find more on Optimization in Help Center and File Exchange

Products

Community Treasure Hunt

Find the treasures in MATLAB Central and discover how the community can help you!

Start Hunting!