HP Prime Graphing NW280AAABA manual Enters the mathematical constant e Euler’s number

delcols Given a matrix and an integer n, deletes the nth column from the matrix and returns the result. If an interval of two integers is used instead of a single integer, deletes all columns in the interval and returns the result.

delcols(Matrix, Integer) or delcols(Matrix, Intg1..Intg2)

Example:

⎛	1 2 3	⎞
⎜		⎟	returns
delcols ⎜	4 5 6	, 2⎟
⎜	7 8 9	⎟
⎝		⎠

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delrows Given a matrix and an integer n, deletes the nth row from the matrix and returns the result. If an interval of two integers is used instead of a single integer, deletes all rows in the interval and returns the result.

delrows(Matrix, Integer) or delrows(Matrix, Intg1..Intg2)

Example:

⎛	1 2 3	⎞
⎜		⎟	returns	1 2 3
delrows ⎜	4 5 6	, 2..3⎟
⎜	7 8 9	⎟
⎝		⎠

deltalist Returns the list of the differences between consecutive terms in the original list.

deltalist(Lst)

Example:

deltalist([1,4,8,9]) gives [3,4,1]

Dirac Returns the value of the Dirac delta function for a real number.

Dirac(Real)

Example:

Dirac(1) gives 0

eEnters the mathematical constant e (Euler’s number).

388 Functions and commands