--- a/w4mcorcov_util.R	Sun Mar 04 14:51:42 2018 -0500
+++ b/w4mcorcov_util.R	Fri Mar 30 14:59:19 2018 -0400
@@ -21,66 +21,8 @@
   return (retval)
 }
 
-# turn off all plotting devices
-dev.off.all <- function() {
-  while (!is.null(dev.list())) { dev.off() }
-}
-  
-# capture plot and write to PDF; then close any devices opened in the process
-plot2pdf <- function(
-  file.name
-, plot.function
-, width = 12
-, height = 12
-) {
-  # capture plot and write to PDF
-  cur.dev <- dev.list()
-  filename <- file.name
-  pdf(file = filename, width = width, height = height)
-  plot.function()
-  # close any devices opened in the process
-  dev.off()
-  if (is.null(cur.dev)) {
-      dev.off.all()
-  } else {
-      while ( length(dev.list()) > length(cur.dev) ) { dev.off() }
-  }
-}
 
-# print and capture plot and write to PDF; then close any devices opened in the process
-#   This is needed for ggplot which does not print the plot when invoked within a function.
-print2pdf <- function(
-  file.name
-, plot.function
-, width = 12
-, height = 12
-) {
-  plot2pdf(
-    file.name = file.name
-  , width = width
-  , height = height
-  , plot.function = function() {
-      print(plot.function())
-    }
-  )
-}
-
-iso8601.znow <- function()
-{
-  strftime(as.POSIXlt(Sys.time(), "UTC"), "%Y-%m-%dT%H:%M:%SZ")
-}
-
-# pdf.name <- function(name)
-# {
-#   paste0(name, "_", iso8601.filename.fragment(), ".pdf")
-# }
-#
-# tsv.name <- function(name)
-# {
-#   paste0(name, "_", iso8601.filename.fragment(), ".tsv")
-# }
-#
-# # pseudo-inverse - computational inverse non-square matrix a
+# # pseudo-inverse - computational inverse of non-square matrix a
 # p.i <- function(a) {
 #   solve(t(a) %*% a) %*% t(a)
 # }