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the title exactly -- is there a way to call an r process from an excel macro?
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Start with the default template and rename it as needed, placing it in an "r" subfolder of the folder where your Excel file is located. Copy excelhelper. r to the "r" folder created in step 1. Write the piece of code in VBA what will call your script first to get some data in the tmp folder before coding your R script.
This tutorial describes how to run Visual Basic (VBA) script in R. Most of the times, we need to integrate R with Excel to make formating changes in excel workbook. With VBA, we can do a lot of things such as creating pivot table, applying functions, reshaping data, creating charts etc.
I am unfamiliar with r process, but this link appears to be valid for your question.
http://www.unt.edu/rss/class/splus/UsingRWithinExcel.pdf
RExcel - Using R from within Excel
Overview
The Excel addin RExcel.xla allows to use R from within Excel. The package additionally contains some
Excel workbooks demonstrating different techniques for using R in Excel.
There are two types of servers, forground and background. The background server ist totally hidden from the
user, all interaction with R has to be done in Excel. The foreground server allows direct access to the R GUI
command line while working in Excel. The backgound server is installed with the R(D)COM server, the
background server depends on the {R}-package rcom, which has to be installed >from CRAN.
Usage
There are at least three different ways of using R from within Excel Scratchpad mode Writing R Code directly in an Excel worksheet and transferring scalar, vector, and matrix variables between R and Excel
Macro mode
Writing macros using VBA and the macros supplied by RExcel.xla, attaching the macros to menu items or toolbar items
Worksheet functions
R can be called directly in functions in worksheet cells
Scratchpad Mode
The RExcel menu contains the following items:
R Start
Initiates a connection to R If necessary starts an R process to be accessed >from Excel For the details of executing code at startup see section Startup
Close R
When this process is running, R Start changes to Close R Run Code Selecting a range (only one column wide) in Excel containing valid R code and then choosing this menu item executes the selected code
Get
Gets the value of an R variable into the active Excel cell or range Possible values are scalars and matrices of numbers or strings, or dataframes.
Put
Puts the values of the selected Excel range into an R variable. Possible values are scalars and matrices of numbers or strings, or dataframes. If a dataframe is to be put, the first row of the Excel range must contain the variable names for the dataframe. Put for dataframes only transfers data in visible rows and columns, hidden rows and columns will not be transferred.
Copy Code
Puts the content of the selected range on the Windows clipboard, assuming that it is R code, and wraps the code in VBA procedure calls to make it ready for inclusion in VBA macros
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RExcel, a free add-in for Excel that can be downloaded from the R distribution network. RExcel seamlessly integrates the entire set of R's statistical and graphical methods into Excel.
The book R Through Excel offers a good entry for those just beginning with R through the familiar Microsoft Excel..
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