Allows access to data in running instance of Microsoft Excel
(e. g. xl[a1] = xl[b2]*3 and so on). Graphics can be transferred with
xl[a1] = current.graphics(). There is an Excel workbook with examples of
calling R from Excel in the 'doc' folder. It tries to keep things as
simple as possible - there are no needs in any additional
installations besides R, only 'VBA' code in the Excel workbook.
Microsoft Excel is required for this package.
The excel.link package mainly consists of two rather independent parts: one is for transferring data/graphics to running instance of Excel, another part - work with data table in Excel in similar way as with usual data.frame.
Package provided family of objects: xl, xlc, xlr and xlrc. You don't need to initialize these objects or to do any other preliminary actions. Just after execution library(excel.link) you can transfer data to Excel active sheet by simple assignment, for example: xlrc[a1] = iris. In this notation 'iris' dataset will be written with column and row names. If you doesn't need column/row names just remove 'r'/'c' letters (xlc[a1] = iris - with column names but without row names). To read Excel data just type something like this: xl[a1:b5]. You will get data.frame with values from range a1:a5 without column and row names. It is possible to use named ranges (e. g. xl[MyNamedRange]). To transfer graphics use xl[a1] = current.graphics().
For example we put iris datasset to Excel sheet:
xlc[a1] = iris. After that we connect Excel range with R object: xl_iris = xl.connect.table("a1",row.names = FALSE, col.names = TRUE).
So we can:
- get data from this Excel range:
xl_iris$Species - add new data to this Excel range:
xl_iris$new_column = 42 - sort this range:
sort(xl_iris,column = "Sepal.Length") - and more...
To comply CRAN policy includes source code from RDCOMClient package (http://www.omegahat.org/RDCOMClient) by Duncan Temple Lang (duncan at wald.ucdavis.edu).