what is the error? Example?

(1)

% ket Transforms a vector into normalized column vector.

function w=ket(;5)

[y,x]=size(v);

if x>1,

w=v.';

else

w=v;

end % if

% normalisation

w=w/sqrt(w'*w);

(2)

function Q = bra_ket(Psi,Phi,f_op)

Q = integral3(@(r1,r2,r3) Psi(r1,r2,r3).*f_op(Phi(r1,r2,r3)),r1min,r1max,r2min,r2max,r3min,r3max)

end

(3)

function Q = bra_ket_traps(Psi,Phi,f_op,r1,r2,r3)

opPhi = f_op(Phi,r1,r2,r3); % Here you might need additional argument

Q = trapz(r3(1,1,:),trapz(r2(1,:,1),trapz(r1(:,:,1),conj(Psi).*(opPhi)),2),3);

end

(4)

% cohstate cohstate(alpha,M) gives the state vector of M elements for

% a coherent state with given alpha

function v=cohstate(alpha,M)

v=zeros(M,1);

v((0)+1)=1;

for n=0:M-2

v((n+1)+1)=alpha/sqrt(n+1)*v((n)+1);

end % for

v=v/sqrt(v'*v);

Answer 1

[Luca Ferro]

there is a ';' in the function call on line 1: function w=ket(;5)

[Idrees Muhammad]

hi,please give me one example.

Answer 2

[Voss]

Invalid syntax:

function w=ket(;5)

Inside the parentheses in a function definition should be a list of variable names. ";5" is not a list of variable names.

Maybe you meant:

function w=ket(v)

[Idrees Muhammad]

Hi , whenever i put v codes also not working ,give the messssage( require more arguments for input)

[Voss]

I see you added more functions to the question. What's the complete error message you get now?

[Idrees Muhammad]

[Idrees Muhammad]

[Walter Roberson]

You need to either call ket from other code or else you need to go down to the command line and invoke it passing in values. For example

V = [2, 3-2i, -4]
ket(V)

[Idrees Muhammad]

[Idrees Muhammad]

[Idrees Muhammad]

[Walter Roberson]

Question: when you go to run cohstate by pressing the green Run button, where are you expecting matlab to look to find values for alpha and M?

[Idrees Muhammad]

i mean that how i put the numeric values for "alpha" and "m" to get the results of thie cohstate

[Walter Roberson]

If you are using the option on the green Run button to have it prompt you for the parameter values then OK, go ahead and do that. Personally I find doing that to be slow and not to offer me fine enough control for my purposes, but if that is what you want to do, go ahead and get back to us if you encounter further errors in your code.

Personally I use the techniques I described earlier https://www.mathworks.com/matlabcentral/answers/1909685-what-is-the-error-example#comment_2608885