Support NA and Inf values

[rossellhayes]

library(fracture)

fracture(c(NA, Inf, -Inf, 0.5))
#> [1] NA       "Inf/1"  "-Inf/1" "1/2"

fracture(c(NA, Inf, -Inf, 0.5), mixed = TRUE)
#> [1] NA     "Inf"  "-Inf" "1/2"

frac_mat(c(NA, Inf, -Inf, 0.5))
#>             [,1] [,2] [,3] [,4]
#> numerator     NA  Inf -Inf    1
#> denominator   NA    1    1    2

frac_mat(c(NA, Inf, -Inf, 0.5), mixed = TRUE)
#>             [,1] [,2] [,3] [,4]
#> integer       NA  Inf -Inf    0
#> numerator     NA    0    0    1
#> denominator   NA    1    1    2

^{Created on 2021-11-02 by the reprex package (v2.0.1)}

Closes #13.

[codecov]

Codecov Report

Merging #14 (b1b1695) into main (a561939) will not change coverage.
The diff coverage is 100.00%.

@@            Coverage Diff            @@
##              main       #14   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files            7         7           
  Lines          238       261   +23     
=========================================
+ Hits           238       261   +23     

Impacted Files	Coverage Δ
R/frac_mat.R	100.00% <100.00%> (ø)
R/fracture.R	100.00% <100.00%> (ø)

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