icd (version 3.3)

comorbid_mat_to_df: convert comorbidity data frame from matrix

Description

convert matrix of comorbidities into data frame, preserving visit_name information

Usage

comorbid_mat_to_df(x, visit_name = "visit_id",
  stringsAsFactors = getOption("stringsAsFactors"))

Arguments

x

Matrix of comorbidities, with row and columns names defined

visit_name

Single character string with name for new column in output data frame. Everywhere else, visit_name describes the input data, but here it is for output data.

stringsAsFactors

Single logical value, describing whether the resulting data frame should have strings, e.g. visit_id converted to factor. Default is to follow the current session option. This is identical to the argument used in, among other base functions as.data.frame.

Examples

# NOT RUN {
longdf <- icd_long_data(
            visit_id = c("a", "b", "b", "c"),
            icd9 = as.icd9(c("441", "4240", "443", "441")))
mat <- icd9_comorbid_elix(longdf)
class(mat)
typeof(mat)
rownames(mat)
df.out <- comorbid_mat_to_df(mat)
stopifnot(is.data.frame(df.out))
# output data frame has a factor for the visit_name column
stopifnot(identical(rownames(mat), as.character(df.out[["visit_id"]])))
df.out[, 1:4]
# when creating a data frame like this, stringsAsFactors uses
# the system-wide option you may have set e.g. with
# options("stringsAsFactors" = FALSE).
is.factor(df.out[["visit_id"]])
# }