projection

Documentation

Index

• func BuildProjectionTable(tablename string, projectiontablename string)
• func CentreAnalysis(p []int, WY []int) (ptype int, subtype int, W []int)
• func GetFanoByGenusBasket(g int, B [][]int, db *sql.DB, tablename string) (*fanoData, error)
• func GetFanoByID(id int, db *sql.DB, tablename string) (*fanoData, error)
• func GetFanoGenusBasketDegreeByID(id int, db *sql.DB, tablename string) (int, [][]int, *rational.Element, error)
• func GetFanoIndexByGenusBasket(g int, B [][]int, db *sql.DB, tablename string) (int, error)
• func GetFanoWeightsByID(id int, db *sql.DB, tablename string) ([]int, error)
• func GetProjectionCentresAndTargetWeightsBySourceID(id int, db *sql.DB, tablename string, projectiontablename string) (centres [][]int, targetWs [][]int, err error)
• func GetRestrictedFanoIndexByGenusBasket(g int, B [][]int, db *sql.DB, tablename string, i int) (int, error)
• func MinDivisibleInt(k int, S ...int) int

Functions

func BuildProjectionTable

func BuildProjectionTable(tablename string, projectiontablename string)

BuildProjectionTable writes the initial projection data to sqlite

func CentreAnalysis

func CentreAnalysis(p []int, WY []int) (ptype int, subtype int, W []int)

CentreAnalysis determines whether projection from p with target ambient weights WY is Type I, II_n or IV, and returns the ambient weights of the unprojection.

func GetFanoByGenusBasket

func GetFanoByGenusBasket(g int, B [][]int, db *sql.DB, tablename string) (*fanoData, error)

GetFanoByGenusBasket retrieves a Fano from sqlite by its g,B.

func GetFanoByID

func GetFanoByID(id int, db *sql.DB, tablename string) (*fanoData, error)

GetFanoByID retrieves a Fano from sqlite by its grdbid.

func GetFanoGenusBasketDegreeByID

func GetFanoGenusBasketDegreeByID(id int, db *sql.DB, tablename string) (int, [][]int, *rational.Element, error)

GetFanoGenusBasketDegreeByID retrieves a Fano's genus, basket and degree from sqlite by its grdbid.

func GetFanoIndexByGenusBasket

func GetFanoIndexByGenusBasket(g int, B [][]int, db *sql.DB, tablename string) (int, error)

GetFanoIndexByGenusBasket retrieves the index of a Fano from sqlite by its g,B.

func GetFanoWeightsByID

func GetFanoWeightsByID(id int, db *sql.DB, tablename string) ([]int, error)

GetFanoWeightsByID retrieves a Fano's ambient weights from sqlite by its grdbid.

func GetProjectionCentresAndTargetWeightsBySourceID

func GetProjectionCentresAndTargetWeightsBySourceID(id int, db *sql.DB, tablename string, projectiontablename string) (centres [][]int, targetWs [][]int, err error)

GetProjectionCentresAndTargetWeightsBySourceID retrieves that data from sqlite by its grdbid.

func GetRestrictedFanoIndexByGenusBasket

func GetRestrictedFanoIndexByGenusBasket(g int, B [][]int, db *sql.DB, tablename string, i int) (int, error)

GetRestrictedFanoIndexByGenusBasket retrieves the index of a Fano from sqlite by its g,B BUT restricting to those indices < i.

func MinDivisibleInt

func MinDivisibleInt(k int, S ...int) int

MinDivisibleInt returns the smallest value in the slice S divisible by k. If no such then 0 is returned.