Manual Reference Pages - floor (3fortran)
FLOOR(3) - [NUMERIC] Function to return largest integral value not greater than argument
SYNOPSIS
result = floor(a [,kind])
elemental integer(kind=KIND) function floor( a ,kind )real(kind=**),intent(in) :: a integer(kind=**),intent(in),optional :: KIND
CHARACTERISTICS
o a kind designated as ** may be any supported kind for the type o A is a real of any kind o KIND is any valid value for type integer. o the result is an integer of the specified or default kind
DESCRIPTION
FLOOR(3) returns the greatest integer less than or equal to A.
In other words, it picks the whole number at or to the left of the value on the number line.
This means care has to be taken that the magnitude of the real value A does not exceed the range of the output value, as the range of values supported by real values is typically larger than the range for integers.
OPTIONS
o A : The value to operate on. Valid values are restricted by the size of the returned integer kind to the range -HUGE(INT(A,KIND=KIND))-1 to HUGE(INT(A),KIND=KIND). o KIND : A scalar integer constant initialization expression indicating the kind parameter of the result.
RESULT
The return value is of type integer(kind) if KIND is present and of default-kind integer otherwise.
The result is undefined if it cannot be represented in the specified integer type.
If in range for the kind of the result the result is the whole number at or to the left of the input value on the number line.
If A is positive the result is the value with the fractional part removed.
If A is negative, it is the whole number at or to the left of the input value.
EXAMPLES
Sample program:
program demo_floor implicit none real :: x = 63.29 real :: y = -63.59 print *, x, floor(x) print *, y, floor(y) ! elemental print *,floor([ & & -2.7, -2.5, -2.2, -2.0, -1.5, -1.0, -0.5, & & 0.0, & & +0.5, +1.0, +1.5, +2.0, +2.2, +2.5, +2.7 ])Results:! note even a small deviation from the whole number changes the result print *, [2.0,2.0-epsilon(0.0),2.0-2*epsilon(0.0)] print *,floor([2.0,2.0-epsilon(0.0),2.0-2*epsilon(0.0)])
! A=Nan, Infinity or huge(0_KIND)-1 < A > huge(0_KIND) is undefined end program demo_floor
> 63.29000 63 > -63.59000 -64 > -3 -3 -3 -2 -2 -1 > -1 0 0 1 1 2 > 2 2 2 > 2.000000 2.000000 2.000000 > 2 1 1
STANDARD
Fortran 95
SEE ALSO
CEILING(3), NINT(3), AINT(3), ANINT(3), INT(3), SELECTED_INT_KIND(3)
Fortran intrinsic descriptions (license: MIT) @urbanjost
| Nemo Release 3.1 | floor (3fortran) | November 02, 2024 |
