what is the error? Example?

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Idrees Muhammad 2023-2-9

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此问题的直接链接

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评论： Walter Roberson 2023-2-10

(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);

回答（2 个）

Luca Ferro 2023-2-9

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https://ww2.mathworks.cn/matlabcentral/answers/1909685-what-is-the-error-example#answer_1167765

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

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Idrees Muhammad 2023-2-10

hi,please give me one example.

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Voss 2023-2-9

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在 MATLAB Online 中打开

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)

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Idrees Muhammad 2023-2-10

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

Walter Roberson 2023-2-10

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

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