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FLOATS_EQUAL

## Name

FLOATS_EQUAL

## Purpose

The purpose of this function is to compare two floating-point values or
arrays to determine if the values or arrays are equal. Arrays are equal
if they have the same number of elements, and each element is equal.

## Author

FANNING SOFTWARE CONSULTING
David Fanning, Ph.D.
1645 Sheely Drive
Fort Collins, CO 80526 USA
Phone: 970-221-0438
E-mail: david@idlcoyote.com
Coyote's Guide to IDL Programming: http://www.idlcoyote.com

Utilities

## Calling Sequence

result = FLOATS_EQUAL(array_1, array_2)

## Arguments

array_1 Any single or double precision value or array. Required parameter.
array_2 Any single or double precision value or array. Required parameter.

## Keywords

ULP UNIT in the LAST PLACE. It is the gap or difference between two
floating point numbers in the last digit that can distinguish the
two numbers. Must be a positive integer. Set to 1 by default. Set
to a larger value if you suspect accumulative round-off errors

## Return Value

result Set to 1 if the arrays are equal, which means that the arrays have
the same number of elements and each element is equal to the same
element in the other array. Set to 0 if the arrays are not equal.

None.

## Example

IDL> a = Findgen(11)
IDL> b = Findgen(11)
IDL> Print, Floats_Equal(a,b)
1
IDL> b[4] = b[4] + 0.0001
IDL> Print, Floats_Equal(a,b)
0

None.

## Modification History

Written by: David W. Fanning, 29 August 2007.
Fixed a problem when using large numbers with the TOTAL command
by setting the INTEGER keyword. 22 June 2011. DWF.

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