listed functions
////////////////////////////

library(tidyxl)
help(package=tidyxl)

tidyxl-package       tidyxl: Import xlsx (Excel) spreadsheet data and formatting into tidy structures.
excel_functions      Names of all Excel functions
is_date_format       Test that Excel number formats are date formats
is_range             Test that Excel formulas are ranges
maybe_xlsx           Determine file format
tidyxl               tidyxl: Import xlsx (Excel) spreadsheet data and formatting into tidy structures.
tidy_xlsx            Import xlsx (Excel) cell contents into a tidy structure.
xlex                 Parse xlsx (Excel) formulas into tokens
xlsx_cells           Import xlsx (Excel) cell contents into a tidy structure.
xlsx_color_standard  Names and RGB values of Excel standard colours
xlsx_color_theme     Import theme color definitions from xlsx (Excel) files
xlsx_colour_standard Names and RGB values of Excel standard colours
xlsx_colour_theme    Import theme color definitions from xlsx (Excel) files
xlsx_formats         Import xlsx (Excel) formatting definitions.
xlsx_names           Import named formulas from xlsx (Excel) files
xlsx_sheet_names     List sheets in an xlsx (Excel) file
xlsx_validation      Import data validation rules of cells in xlsx (Excel) files

////////////////////////////

////////////////////////////
source('http://datayyy.com/fmr/week6.txt')

> apropos("excel")
 [1] ".copyFinStatementFromYahoo2Excel"  ".data2excel"                      
 [3] ".data2Excel"                       ".data2excel_Mac"                  
 [5] ".data2Excel_Mac"                   ".data2excel_Windows"              
 [7] ".data2Excel_Windows"               ".finS2excel"                      
 [9] ".finS2Excel"                       ".image2excel"                     
[11] ".image2Excel"                      ".mimicExcel"                      
[13] ".mimicexcel_"                      ".zcopyFinStatementFromYahoo2Excel"
[15] ".zdata2excel_"                     ".zdata2excel_Mac_"                
[17] ".zdata2excel_Windows_"             ".zimage2excel"    

////////////////////////////