Conventions used

There are a number of text conventions used throughout this book.

CodeInText: Indicates code words in text, database table names, folder names, filenames, file extensions, pathnames, dummy URLs, user input, and Twitter handles. Here is an example: "To calculate crosstabulations – the relationship between two (or more) variables – we will use two functions: rxCrossTabs and rxMargins."

A block of code is set as follows:

> df <- data.frame(unlist(var_info)) 
> df 

Any command-line input or output is written as follows:

EXECsp_execute_external_script
          @language = N'R'
          ,@script = N'
                      library(RevoScaleR)
                      df_sql <- InputDataSet        
                      var_info <- rxGetInfo(df_sql)
                      OutputDataSet <- data.frame(unlist(var_info))'
                      ,@input_data_1 = N'
                      SELECT 
                       BusinessEntityID
                      ,[Name]
                      ,SalesPersonID
                      FROM [Sales].[Store]'

Bold: Indicates a new term, an important word, or words that you see onscreen. For example, words in menus or dialog boxes appear in the text like this. Here is an example: "You can always check the run_value of external scripts enabled if it is set to 1."