C Library Functions - almost (3)

NAME

almost(3f) - [M_framework__approx] return true or false if two numbers agree up to specified number of digits (LICENSE:PD)

Synopsis
Description
Options
Returns
Examples
Author
License

SYNOPSIS

elemental impure function almost(x,y,digits,verbose)

    class(*),intent(in)         :: x,y
    class(*),intent(in)         :: rdigits
    logical,intent(in),optional :: verbose
    logical                     :: almost

DESCRIPTION

Returns true or false depending on whether the two numbers given agree to within the specified number of digits as calculated by ACCDIG(3f).

OPTIONS

x,y expected and calculated values to be compared. May be of type REAL, INTEGER, or DOUBLEPRECISION.

rdigits
number of digits of precision to compare. May be INTEGER or REAL.

verbose
optional value that specifies to print the results of the comparison when set to .TRUE..

RETURNS

almost TRUE if the input values compare up to the specified number of values

EXAMPLES

sample:

   program demo_almost
   use M_framework__approx, only : almost
   implicit none
   real    :: x, y
   logical :: z
   integer :: i
   x=1.2345678
   y=1.2300000
   do i=1,8
      z=almost(x,y,i,verbose=.true.)
      write(*,*)i,z
   enddo
   end program demo_almost

Results:

> *almost* for values 1.23456776 1.23000002 agreement of 2.43020344 ... > digits out of requested 1.00000000 > 1 T > *almost* for values 1.23456776 1.23000002 agreement of 2.43020344 ... > digits out of requested 2.00000000 > 2 T > *almost* for values 1.23456776 1.23000002 agreement of 2.43020344 ... > digits out of requested 3.00000000 > 3 F > *almost* for values 1.23456776 1.23000002 agreement of 2.43020344 ... > digits out of requested 4.00000000 > 4 F > *almost* for values 1.23456776 1.23000002 agreement of 2.43020344 ... > digits out of requested 5.00000000 > 5 F > *almost* for values 1.23456776 1.23000002 agreement of 2.43020344 ... > digits out of requested 6.00000000 > 6 F > *almost* for values 1.23456776 1.23000002 agreement of 2.43020344 ... > digits out of requested 7.00000000 > 7 F > *sp_accdig* significant digit request too high= 8.00000000 > *almost* for values 1.23456776 1.23000002 agreement of 2.43020344 ... > digits out of requested 8.00000000 > 8 F

AUTHOR

John S. Urban

LICENSE

Public Domain

Nemo Release 3.1

almost (3)

June 29, 2025

Generated by manServer 1.08 from af23c5a3-3942-4e99-ad69-f09ec16adca8 using man macros.

x,y	expected and calculated values to be compared. May be of type REAL, INTEGER, or DOUBLEPRECISION.
rdigits
	number of digits of precision to compare. May be INTEGER or REAL.
verbose
	optional value that specifies to print the results of the comparison when set to .TRUE..