length — Length of Entity


\begin{rail} Length : 'length' '(' ( Scalar \vert Matrix ) ')' ; \end{rail}
The length function returns the length of the argument. The meaning of length varies according to the argument type:
scalar
the length is 1.
string
the number of characters in the string, not including the trailing null.
matrix
the greater of the number of rows and the number of columns.
list
the number of elements in the list.

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