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Macaulay2 web site
Nothing -- the empty class
Description
This class is useful for representing the class of an argument that is missing. It is also used as the parent for those things that are not themselves types, i.e., which do not have instances.
Types of Nothing :
InexactNumber'
Functions and methods returning an object of class Nothing :
echoOff(File), see
echoOff
-- turn off echoing
echoOn(File), see
echoOn
-- turn on echoing
kill(File), see
kill
-- kill a process
linkFile(String,String)
-- make a new link to a file
remove(HashTable,Thing), see
remove
-- remove an entry from a hash table
scan(BasicList,Function)
-- apply a function to each element of a list
scan(ZZ,Function)
-- apply a function to 0 .. n-1
scanPairs(HashTable,Function)
-- apply a function to pairs in a hash table
Methods that use an object of class Nothing :
Nothing == Nothing, see
==
-- equality
concatenate(Nothing), see
concatenate
-- join strings
Nothing << Manipulator, see
File << Thing
-- print to a file
Nothing << Thing, see
File << Thing
-- print to a file
getWWW(String,Nothing), see
getWWW
-- get a web page
inducedMap(Module,Nothing,Matrix), see
inducedMap(Module,Module,Matrix)
-- compute the induced map
inducedMap(Nothing,Module,Matrix), see
inducedMap(Module,Module,Matrix)
-- compute the induced map
inducedMap(Nothing,Nothing,Matrix), see
inducedMap(Module,Module,Matrix)
-- compute the induced map
inducesWellDefinedMap(Module,Nothing,Matrix), see
inducesWellDefinedMap
-- whether a map is well defined
inducesWellDefinedMap(Nothing,Module,Matrix), see
inducesWellDefinedMap
-- whether a map is well defined
inducesWellDefinedMap(Nothing,Nothing,Matrix), see
inducesWellDefinedMap
-- whether a map is well defined
locate(Nothing), see
locate
-- locate source code
Manipulator Nothing, see
Manipulator
-- the class of all file manipulators
map(Module,Nothing,RingMap,List), see
map(Module,Module,RingMap,Matrix)
-- homomorphism of modules over different rings
map(Module,Nothing,RingMap,Matrix), see
map(Module,Module,RingMap,Matrix)
-- homomorphism of modules over different rings
map(Module,Nothing,List)
-- create a matrix by giving a doubly nested list of ring elements
map(Module,Nothing,Matrix)
-- recast a matrix to have a new target, and a free module as source
modulo(Matrix,Nothing), see
modulo(Matrix,Matrix)
-- find the pre-image (pullback) of image of a map (low level version)
modulo(Nothing,Matrix), see
modulo(Matrix,Matrix)
-- find the pre-image (pullback) of image of a map (low level version)
part(Nothing,Nothing,RingElement), see
part(ZZ,ZZ,VisibleList,RingElement)
-- select terms of a polynomial by degree or weight
part(Nothing,Nothing,VisibleList,RingElement), see
part(ZZ,ZZ,VisibleList,RingElement)
-- select terms of a polynomial by degree or weight
part(Nothing,ZZ,RingElement), see
part(ZZ,ZZ,VisibleList,RingElement)
-- select terms of a polynomial by degree or weight
part(Nothing,ZZ,VisibleList,RingElement), see
part(ZZ,ZZ,VisibleList,RingElement)
-- select terms of a polynomial by degree or weight
part(ZZ,Nothing,RingElement), see
part(ZZ,ZZ,VisibleList,RingElement)
-- select terms of a polynomial by degree or weight
part(ZZ,Nothing,VisibleList,RingElement), see
part(ZZ,ZZ,VisibleList,RingElement)
-- select terms of a polynomial by degree or weight
sublists(VisibleList,Function,Function,Nothing), see
sublists
-- process interspersed sublists of a list
sublists(VisibleList,Function,Nothing), see
sublists
-- process interspersed sublists of a list
sublists(VisibleList,Function,Nothing,Function), see
sublists
-- process interspersed sublists of a list
sublists(VisibleList,Function,Nothing,Nothing), see
sublists
-- process interspersed sublists of a list
submatrix'(Matrix,Nothing,VisibleList), see
submatrix'
-- exclude rows and/or columns of a matrix
submatrix'(Matrix,VisibleList,Nothing), see
submatrix'
-- exclude rows and/or columns of a matrix
submatrix(Matrix,Nothing,VisibleList), see
submatrix(Matrix,VisibleList,VisibleList)
-- select part of a matrix
submatrix(Matrix,VisibleList,Nothing), see
submatrix(Matrix,VisibleList,VisibleList)
-- select part of a matrix
subquotient(Matrix,Nothing), see
subquotient
-- make a subquotient module
subquotient(Module,Matrix,Nothing), see
subquotient
-- make a subquotient module
subquotient(Module,Nothing,Matrix), see
subquotient
-- make a subquotient module
subquotient(Module,Nothing,Nothing), see
subquotient
-- make a subquotient module
subquotient(Nothing,Matrix), see
subquotient
-- make a subquotient module
symmetricAlgebra(Nothing,Nothing,Matrix), see
symmetricAlgebra
-- the symmetric algebra of a module
symmetricAlgebra(Nothing,Ring,Matrix), see
symmetricAlgebra
-- the symmetric algebra of a module
symmetricAlgebra(Ring,Nothing,Matrix), see
symmetricAlgebra
-- the symmetric algebra of a module
Fixed objects of class Nothing :
null
-- the unique member of the empty class
For the programmer
The object
Nothing
is
a
type
, with ancestor class
Thing
.