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\par  Function File: [\textit{func}] \textbf{=}\textit{ Function }(\textit{name, FunctionSpace }(\textit{or Function})\textit{,Vector }(\textit{or index}))\textit{}\\
\begin{quotation}\par Initialize an object with the values specified in a vector or extracting a component from a vectorial field. 
This function can be used in two different ways
          \begin{itemize}
\item To create a function from a vector. In this case, the arguments are:
               \begin{itemize}
\item \textit{name} is a string representing the name of the function
\item \textit{FunctionSpace} is the fem-fenics function space where the vector is defined
\item \textit{Vector} specifies the values of the coefficientsfor each basisc function of the \textit{FunctioSpace}
\end{itemize}
          \item To extract a scalar field from a vectorial one
               \begin{itemize}
\item \textit{name} is a string representing the name of the function
\item \textit{Function} is the vector valued Function
\item \textit{Index} contains the index of the scalar field to extract.Index starts from 1. 
\end{itemize}
          \end{itemize}
        The output \textit{func} is an object which contains a representation of the function \textit{Vector} which can be plotted or saved or passed as argument for a variational problem.

     \par \textbf{See also:} Constant, Expression, plot, save.

        \end{quotation}