nan(
nan(
VALUE
)

The nan( function checks to see if a numeric value is invalid.

Parameters

This function has one parameter:

value – floating point value or expression

Description

This function checks to see if a value is an invalid number. (The function name nan( stands for not a number). What is an invalid number, you ask? Some examples would include anything divided by zero or the square root of a negative number.

    nan(5/2) ☞ false
    nan(5/0) ☞ true
    nan(sqr(8)) ☞ false
    nan(sqr(-8)) ☞ true

Note: The nan( function is the opposite of validnumber(, which returns true if the value is valid, false if it is invalid.

See Also

- @trigonometry --
- / --
- sqr( --
- validnumber( -- checks to see if a numeric value is valid.

History

Version | Status | Notes
10.0 | New | New in this version