flog transform function

flog transform function constructor. It is different from flowCore version of logtGml2 in the way that it reset negative input so that no NAN will be returned.

flowjo_log_trans(decade = 4.5, offset = 1, scale = 1, n = 6,
  equal.space = FALSE)

flowJo.flog(decade = 4.5, offset = 1, max_val = 262144,
  min_val = 0, scale = 1, inverse = FALSE)

Arguments

decade	total number of decades (i.e. log(max)-log(min)
offset	offset to the orignal input(i.e. min value)
scale	the linear scale factor
inverse	whether return the inverse function

Value

flog(or its inverse) transform function

Examples

trans <- flowjo_log_trans()
data.raw <- c(1,1e2,1e3)
data.trans <- trans[["transform"]](data.raw)
data.trans
#> [1] 0.0000000 0.4444444 0.6666667

inverse.trans <- trans[["inverse"]]
inverse.trans(data.trans)
#> [1]    1  100 1000

#negative input
data.raw <- c(-10,1e2,1e3)
data.trans <- trans[["transform"]](data.raw)
data.trans
#> [1] 0.0000000 0.4444444 0.6666667
inverse.trans(data.trans)#we lose the original value at lower end since flog can't restore negative value
#> [1]    1  100 1000

#different
trans <- flowjo_log_trans(decade = 3, offset = 30)
data.trans <- trans[["transform"]](data.raw)
data.trans
#> [1] 0.0000000 0.1742929 0.5076262
inverse.trans <- trans[["inverse"]]
inverse.trans(data.trans)
#> [1]   30  100 1000