listcompr 0.4.0

renamed expr and str to .expr and .str in all the gen.... functions to allow variables like s and e (fixes #7)
allow (x_1, ..., x_n) short-cuts in nested expressions
allow a_i placeholders within nested vector and list expressions
improved warnings/error messages
fixed infinite recursion occurring when a NULL variable range was given
fix auto-generated column names in a data frame for c(a, c)

listcompr 0.3.0

modified internal conversion from lists to data frames in gen.data.frame such that non-fundamental types are accepted (fixes #5)
added a check to ensure that the inner expression for gen.(named).(data.frame|matrix) must be exactly one row
some output format fixes (data frames and matrices where sometimes mixed up)
added byrow parameter to gen.(named).(data.frame|matrix) which applies the Cartesian product by column to the expression
fixed that gen.named.(vector|list) can be used as an inner expression of other gen.-functions
gen.list and similar functions accept characters with placeholders, removed gen.list.char and gen.vector.char
changed order of dimensions in gen.matrix for auto-detected 2-dim matrix
gen.matrix automatically searches for two dimensions in the ... arguments
fixed missing column names in gen.named.data.frame
added gen.matrix and gen.named.matrix for generating (named) matrices

variable ranges can also be of character type (fixes #1)
fixed sorting of free variables (fixes #2)
auto-detect column names when generating data frames where a symbol is in the base expression
fixed missing export of gen.logical.or, added example to the vignette
allow substitutions in the list comprehension arguments