gexmap : gextest: no visible global function definition for
  'wilcox.test'
gexmap : gextest: no visible global function definition for
  'chisq.test'
gexmap : gextest: no visible global function definition for
  'binom.test'
gexmap : gextest: no visible global function definition for 'pdf'
gexmap : gextest: no visible global function definition for 'matplot'
gexmap : gextest: no visible global function definition for 'legend'
gexmap : gextest: no visible global function definition for 'dev.off'
gexmap : gextest: no visible global function definition for
  'write.table'
gexmap : gexgraph: no visible global function definition for 'pdf'
gexmap : gexgraph: no visible global function definition for 'matplot'
gexmap : gexgraph: no visible global function definition for 'title'
gexmap : gexgraph: no visible global function definition for 'axis'
gexmap : gexgraph: no visible global function definition for 'rect'
gexmap : gexgraph: no visible global function definition for 'text'
gexmap : gexgraph: no visible global function definition for 'legend'
gexmap : gexgraph: no visible global function definition for 'dev.off'
gexmap : gexgo: no visible global function definition for 'write.table'
gexmap : gexgo: no visible global function definition for 'pdf'
gexmap : gexgo: no visible global function definition for 'pie'
gexmap : gexgo: no visible global function definition for 'palette'
gexmap : gexgo: no visible global function definition for 'rainbow'
gexmap : gexgo: no visible global function definition for 'text'
gexmap : gexgo: no visible global function definition for 'dev.off'
gexmap: no visible global function definition for 'flush.console'
gexmap: no visible global function definition for 'read.table'
gexmap: no visible global function definition for 'write.table'
Undefined global functions or variables:
  axis binom.test chisq.test dev.off flush.console legend matplot
  palette pdf pie rainbow read.table rect text title wilcox.test
  write.table
Consider adding
  importFrom("grDevices", "dev.off", "palette", "pdf", "rainbow")
  importFrom("graphics", "axis", "legend", "matplot", "pie", "rect",
             "text", "title")
  importFrom("stats", "binom.test", "chisq.test", "wilcox.test")
  importFrom("utils", "flush.console", "read.table", "write.table")
to your NAMESPACE file.

Found the following calls to data() loading into the global environment:
File 'GExMap/R/gexmap.R':
  data(list)
  data(data)
  data(corr)
See section 'Good practice' in '?data'.