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Standard arithmetic functions including things like rounding,
sign manipulation, and maximum/minimum functions.

roundUp( x )
 Rounds a value up to an integer value.
Formally, returns the smallest (closest to negative infinity)
integer value that is not less than the argument.

roundDown( x )
 Rounds a value down to an integer value.
Formally, returns the largest (closest to positive infinity)
integer value that is not greater than the argument.

round( x )
 Rounds a value to the nearest integer.
Formally,
returns the integer that is closest in value
to the argument. If two integers are
equally close, the result is the even one.

roundDecimal( x, dp )
 Rounds a value to a given number of decimal places.
The result is a
float
(32bit floating point value),
so this is only suitable for relatively lowprecision values.
It's intended for truncating the number of apparent significant
figures represented by a value which you know has been obtained
by combining other values of limited precision.
For more control, see the functions in the Formats
class.

abs( x )
 Returns the absolute value of an integer value.
If the argument is not negative, the argument is returned.
If the argument is negative, the negation of the argument is returned.

abs( x )
 Returns the absolute value of a floating point value.
If the argument is not negative, the argument is returned.
If the argument is negative, the negation of the argument is returned.

max( a, b )
 Returns the greater of two integer values.
If the arguments have the same value, the result is that same value.
Multipleargument maximum functions are also provided in the
Arrays
and Lists
packages.

maxNaN( a, b )
 Returns the greater of two floating point values.
If the arguments have the same value, the result is that same
value. If either value is blank, then the result is blank.

maxReal( a, b )
 Returns the greater of two floating point values, ignoring blanks.
If the arguments have the same value, the result is that same value.
If one argument is blank, the result is the other one.
If both arguments are blank, the result is blank.
Multipleargument maximum functions are also provided in the
Arrays
and Lists
packages.

min( a, b )
 Returns the smaller of two integer values.
If the arguments have the same value, the result is that same value.
Multipleargument minimum functions are also provided in the
Arrays
and Lists
packages.

minNaN( a, b )
 Returns the smaller of two floating point values.
If the arguments have the same value, the result is that same value.
If either value is blank, then the result is blank.

minReal( a, b )
 Returns the smaller of two floating point values, ignoring blanks.
If the arguments have the same value, the result is that same value.
If one argument is blank, the result is the other one.
If both arguments are blank, the result is blank.
Multipleargument minimum functions are also provided in the
Arrays
and Lists
packages.
Next Previous Up Contents
Next: Conversions
Up: General Functions
Previous: Tilings
TOPCAT  Tool for OPerations on Catalogues And Tables
Starlink User Note253
TOPCAT web page:
http://www.starlink.ac.uk/topcat/
Author email:
m.b.taylor@bristol.ac.uk
Mailing list:
topcatuser@jiscmail.ac.uk