library(tinycodet)
#> Run `?tinycodet::tinycodet` to open the introduction help page of 'tinycodet'.Decimal (in)equality testing operators
This package adds the
%d==%, %d!=% %d<%, %d>%, %d<=%, %d>=%
(in)equality operators, which perform safer decimal number truth
testing. They are virtually equivalent to the regular (in)equality
operators, ==, !=, <, >, <=, >=, except for 2
aspects:
The
%d...%operators assume that if the absolute difference between any two numbers x and y is smaller than the Machine tolerance, sqrt(.Machine$double.eps), then x and y should be consider to be equal. For example:0.1*7 == 0.7returnsFALSE, even though they are equal, due to the way decimal numbers are stored in programming languages like ‘R’ and ‘Python’. But0.1*7 %d==% 0.7returnsTRUE.Only numeric input is allowed, so characters are not coerced to numbers. I.e.
1 < "a"givesTRUE, whereas1 %d<% "a"gives an error. For character equality testing, see %s==% from the ‘stringi’ package.
Thus these provide safer decimal number (in)equality operators.
Some examples:
x <- c(0.3, 0.6, 0.7)
y <- c(0.1*3, 0.1*6, 0.1*7)
print(x); print(y)
#> [1] 0.3 0.6 0.7
#> [1] 0.3 0.6 0.7
x == y # gives FALSE, but should be TRUE
#> [1] FALSE FALSE FALSE
x!= y # gives TRUE, should be FALSE
#> [1] TRUE TRUE TRUE
x > y # not wrong
#> [1] FALSE FALSE FALSE
x < y # gives TRUE, should be FALSE
#> [1] TRUE TRUE TRUE
x %d==% y # here it's done correctly
#> [1] TRUE TRUE TRUE
x %d!=% y
#> [1] FALSE FALSE FALSE
x %d<% y # correct
#> [1] FALSE FALSE FALSE
x %d>% y # correct
#> [1] FALSE FALSE FALSE
x %d<=% y # correct
#> [1] TRUE TRUE TRUE
x %d>=% y # correct
#> [1] TRUE TRUE TRUE
There are also the x %d{}% bnd and
x %d!{}% bnd operators, where bnd is a vector
of length 2, or a 2-column matrix
(nrow(bnd)==length(x) or nrow(bnd)==1). The
x %d{}% bnd operator checks if x is within the
closed interval with bounds defined by
bnd. The x %d!{}% bnd operator checks if
x is outside the closed interval with
bounds defined by bnd.
Examples:
x <- c(0.3, 0.6, 0.7)
bnd <- cbind(x-0.1, x+0.1)
x %d{}% bnd
#> [1] TRUE TRUE TRUE
x %d!{}% bnd
#> [1] FALSE FALSE FALSE
Locked constants
One can re-assign the values T and F. One
can even run something like T <- FALSE and
F <- TRUE! tinycodet adds the
lock_TF() function that forces T to stay
TRUE and F to stay FALSE.
Essentially, the lock_TF() function creates the locked
constant T and F, assigned to
TRUE and FALSE respectively, to prevent the
user from re-assigning them. Removing the created T and
F constants allows re-assignment again.
The X %<-c% A operator creates a
constant X with assignment A.
Constants cannot be changed, only accessed or removed. So if you have a
piece of code that requires some unchangeable constant, use this
operator to create said constant.
with_pro and aes_pro
‘tinycodet’ provides standard-evaluated versions of the common
quoting functions with() and ggplot2::aes():
with_pro() and aes_pro(), respectively.
requireNamespace("ggplot2")
#> Loading required namespace: ggplot2
d <- import_data("ggplot2", "mpg")
# mutate data:
myform <- ~ displ + cyl + cty + hwy
d$mysum <- with_pro(d, myform)
summary(d)
#> manufacturer model displ year
#> Length:234 Length:234 Min. :1.600 Min. :1999
#> Class :character Class :character 1st Qu.:2.400 1st Qu.:1999
#> Mode :character Mode :character Median :3.300 Median :2004
#> Mean :3.472 Mean :2004
#> 3rd Qu.:4.600 3rd Qu.:2008
#> Max. :7.000 Max. :2008
#> cyl trans drv cty
#> Min. :4.000 Length:234 Length:234 Min. : 9.00
#> 1st Qu.:4.000 Class :character Class :character 1st Qu.:14.00
#> Median :6.000 Mode :character Mode :character Median :17.00
#> Mean :5.889 Mean :16.86
#> 3rd Qu.:8.000 3rd Qu.:19.00
#> Max. :8.000 Max. :35.00
#> hwy fl class mysum
#> Min. :12.00 Length:234 Length:234 Min. :33.70
#> 1st Qu.:18.00 Class :character Class :character 1st Qu.:43.10
#> Median :24.00 Mode :character Mode :character Median :50.15
#> Mean :23.44 Mean :49.66
#> 3rd Qu.:27.00 3rd Qu.:54.08
#> Max. :44.00 Max. :84.90
# plotting data:
x <- ~ cty
y <- ~ sqrt(hwy)
color <- ~ drv
ggplot2::ggplot(d, aes_pro(x, y, color = color)) +
ggplot2::geom_point()
Safer Partial Matching
The safer_partialmatch() forces ‘R’ to give a warning
when partial matching occurs when using the dollar ($) operator, or when
other forms of partial matching occurs. It simply calls the
following:
options(
warnPartialMatchDollar = TRUE,
warnPartialMatchArgs = TRUE,
warnPartialMatchAttr = TRUE
)