allsums: Row, column, and two diagonal sums of arrays

In RobinHankin/magic: Create and Investigate Magic Squares

Row, column, and two diagonal sums of arrays

Description

Returns all rowsums, all columnsums, and all (broken) diagonal sums of a putative magic square.

Usage

allsums(m,func=NULL, ...)

Arguments

m	The square to be tested
func	Function, with default NULL interpreted assum(), to be applied to the square rowwise, columnwise, and diagonalwise
...	Further arguments passed to func()

Value

Returns a list of four elements. In the following, “sums” means “the result of applying func()”.

rowsums	All n row sums
colsums	All n column sums
majors	All n broken major diagonals (northwest-southeast). First element is the long (unbroken) major diagonal, tested by is.magic()
minors	All n broken minor diagonals (northeast-southwest). First element is the long (unbroken) minor diagonal.

Note

If func() returns a vector, then the allsums() returns a list whose columns are the result of applying func(). See third and fourth examples below.

Used by is.magic() et seq.

The major and minor diagonals would benefit from being recoded in C.

Author(s)

Robin K. S. Hankin

See Also

is.magic,is.semimagic,is.panmagic

Examples

allsums(magic(7))
allsums(magic(7),func=max)

allsums(magic(7),func=range)
allsums(magic(7),func=function(x){x[1:2]})


allsums(magic(7),sort)
  # beware! compare apply(magic(7),1,sort) and apply(magic(7),2,sort)

RobinHankin/magic documentation built on Jan. 17, 2024, 8:36 p.m.