Summaries of spray objects

A summary method for spray objects, and a print method for summaries.

Usage

# S3 method for class 'spray'
summary(object, ...)
# S3 method for class 'summary.spray'
print(x, ...)

Arguments

object,x

Object of class spray

...

Further arguments, passed to head()

Details

A summary.spray object is summary of a spray object x: a list with first element being a summary() of the coefficients (which is a disord object), and the second being a spray object comprising a few selected index-coefficient pairs. The selection is done by head().

Author

Robin K. S. Hankin

Note

The “representative selection” is impementation-specific, as it uses disordR::elements() to extract rows of the index matrix and coefficients.

Examples

a <- rspray()^2
a
#> +202*a^4*b^2*c^2 +4*a^2 +84*a^4*b^2*c +24*a^2*b +28*a^4*b^2*c^3
#> +168*a^3*b^2*c +121*b^4*c^4 +64*b^2 +4*a^3*b*c^2 +224*a^2*b^2*c
#> +56*a^3*b*c +22*a^2*b^3*c^4 +12*a^3*b^2*c^2 +96*a*b^2 +44*a*b^2*c^2
#> +132*a*b^3*c^2 +a^4*b^2*c^4 +36*a^3*b^2 +16*a^2*b^2*c^2 +32*a*b
#> +9*a^4*b^2 +176*b^3*c^2 +84*a^2*b^2 +308*a^2*b^3*c^3 +66*a^2*b^3*c^2
#> +12*a^3*b
summary(a)
#> A spray object.  Summary of coefficients: 
#> 
#> a disord object with hash 771a0c87c8a3259456c6b16e3c36f10195a7ab7a 
#> 
#>    Min. 1st Qu.  Median    Mean 3rd Qu.    Max. 
#>    1.00   17.50   50.00   77.88  114.75  308.00 
#> 
#> 
#> Representative selection of index and coefficients:
#> 
#> +168*a^3*b^2*c +28*a^4*b^2*c^3 +24*a^2*b +84*a^4*b^2*c +4*a^2
#> +202*a^4*b^2*c^2
summary(a,2)
#> A spray object.  Summary of coefficients: 
#> 
#> a disord object with hash 771a0c87c8a3259456c6b16e3c36f10195a7ab7a 
#> 
#>    Min. 1st Qu.  Median    Mean 3rd Qu.    Max. 
#>    1.00   17.50   50.00   77.88  114.75  308.00 
#> 
#> 
#> Representative selection of index and coefficients:
#> 
#> +4*a^2 +202*a^4*b^2*c^2

options(polyform=TRUE)
summary(a^4,3)
#> A spray object.  Summary of coefficients: 
#> 
#> a disord object with hash 4ff6e4bd6f1f0dfd4b1c133cfad5ceb2d6e24366 
#> 
#>      Min.   1st Qu.    Median      Mean   3rd Qu.      Max. 
#> 1.000e+00 2.943e+07 1.100e+09 1.728e+10 1.292e+10 2.960e+11 
#> 
#> 
#> Representative selection of index and coefficients:
#> 
#> +2788156*a^16*b^8*c^12 +155420160*a^12*b^6*c^7 +29850240*a^10*b^5*c^6
options(polyform=FALSE) # restore default