Please Explain Octave-Error : operator /: nonconformant arguments (op1 is 1x1, op2 is 1x10)

Question

I have an issue running a certain script in octave. This is the code that produces the error:

#germanium
T=410:20:600;
x=linspace(400,410,100);
y=linspace(10^9,10^9,100);
k=8.5*10 .^(-5);
Eg=0.59;
Nc300=1.02*10^13;
Nc=Nc300*((T/300).^(3/2));
n=Nc*(e.^(-Eg/(2*k*T)));
plot(T,n,x,y,'m');
grid on
xlabel('Temprature');
ylabel('Electron Density n');
title('Germanium n(T)');

As mentioned in the Title, the error that is produced is the following: error: ger5: operator /: nonconformant arguments (op1 is 1x1, op2 is 1x10) I have done a lot of testing, and I figured that the problem originates from the T variable on the 9th line : n=Nc*(e.^(-Eg/(2*k*T))); The codes run fine without it. For example :

#germanium
T=410:20:600;
x=linspace(400,410,100);
y=linspace(10^9,10^9,100);
k=8.5*10 .^(-5);
Eg=0.59;
Nc300=1.02*10^13;
Nc=Nc300*((T/300).^(3/2));
n=Nc*(e.^(-Eg/(2*k*500)));
plot(T,n,x,y,'m');
grid on
xlabel('Temprature');
ylabel('Electron Density n');
title('Germanium n(T)');

In which case I simply replaced T with 500 , the code runs perfectly fine. Sadly T, can not be replaced by a certain number since it is the variable used in my graph. Although I did some digging, I never managed to fully understand this error, or how to fix it, thus any help would be greatly appreciated. Thanks.

Answer 1

Add a . before your *, /, and ^ signs. This will ensure that octave uses scalar multiplication instead of matrix multiplication.

n=Nc.*(e.^(-Eg./(2.*k.*T)));