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first

Maxima Function

Calling Sequence

first (expr)

Description

Returns the first part of expr which may result in the first element of a list, the first row of a matrix, the first term of a sum, etc. Note that first and its related functions, rest and last, work on the form of expr which is displayed not the form which is typed on input. If the variable inflag is set to true however, these functions will look at the internal form of expr. Note that the simplifier re-orders expressions. Thus first(x+y) will be x if inflag is true and y if inflag is false (first(y+x) gives the same results). The functions second .. tenth yield the second through the tenth part of their input argument.

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