I defined a function with n terms where n is a variable:

LogLH[μ_, σ_] = n Log[a[σ]] - Sum[Log[y[[i]]] +  
(Log[y[[i]]] - μ)^2 / (2 σ^2), {i, 1, n}]

In this function, the y[[i]] are (assumed to represent) observations of a quantity - picked from a list of n elements.

This statement multiply produces the error "The expression i cannot be used as a part specification". It seems however, that M. correctly evaluates the function. M. also computes the partial derivatives for [Mu] and [Sigma]. But the above errors repeat and lateron, I can not apply the Solve command to the resulting system of equations. Hence my question: How can I define an open ended list of n elements in M.?

I defined a function with n terms where n is a variable:

LogLH[μ_, σ_] = n Log[a[σ]] - Sum[Log[y[[i]]] +  
(Log[y[[i]]] - μ)^2 / (2 σ^2), {i, 1, n}]

In this function, the y[[i]] are (assumed to represent) observations of a quantity - picked from a list of n elements.

This statement multiply produces the error "The expression i cannot be used as a part specification". It seems however, that M. correctly evaluates the function. M. also computes the partial derivatives for μ and σ. But the above errors repeat and lateron, I can not apply the Solve command to the resulting system of equations. Hence my question: How can I define an open ended list of n elements in M.?

I defined a function with n terms where n is a variable:

LogLH[\[Mu]_, \[Sigma]_] = n Log[a[\[Sigma]]] - Sum[Log[y[[i]]] +  
(Log[y[[i]]] - \[Mu])^2 / (2 \[Sigma]^2), {i, 1, n}]

In this function, the y[[i]] are (assumed to represent) observations of a quantity - picked from a list of n elements.

This statement multiply produces the error "The expression i cannot be used as a part specification". It seems however, that M. correctly evaluates the function. M. also computes the partial derivatives for [Mu] and [Sigma]. But the above errors repeat and lateron, I can not apply the Solve command to the resulting system of equations. Hence my question: How can I define an open ended list of n elements in M.?

I defined a function with n terms where n is a variable:

LogLH[μ_, σ_] = n Log[a[σ]] - Sum[Log[y[[i]]] +  
(Log[y[[i]]] - μ)^2 / (2 σ^2), {i, 1, n}]

In this function, the y[[i]] are (assumed to represent) observations of a quantity - picked from a list of n elements.

This statement multiply produces the error "The expression i cannot be used as a part specification". It seems however, that M. correctly evaluates the function. M. also computes the partial derivatives for [Mu] and [Sigma]. But the above errors repeat and lateron, I can not apply the Solve command to the resulting system of equations. Hence my question: How can I define an open ended list of n elements in M.?