cellranger v1.1.0

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by Jennifer Bryan

Translate Spreadsheet Cell Ranges to Rows and Columns

Helper functions to work with spreadsheets and the "A1:D10" style of cell range specification.

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Helper package to support R scripts or packages that interact with spreadsheets.

Installation

Option 1: Install from CRAN:

install.packages("cellranger")

Option 2: Install the development version from GitHub:

# install.packages("devtools")
devtools::install_github("jennybc/cellranger")

What is cellranger for?

Describe a rectangle of cells. For example, what you've got is the string "D12:F15" and what you want is an R object that holds the row and column for the upper left and lower right corners of this rectangle. Read below about the cell_limits class. The googlesheets and readODS packages use cellranger to translate user-supplied cell range info into something more programmatically useful.

Handle cell references found in spreadsheet formulas. If you're parsing unevaluated spreadsheet formulas, use the ra_ref and cell_addr classes for handling absolute, relative, and mixed cell references. Classes inspired by Spreadsheet Implementation Technology from Sestoft (MIT Press, 2014).

Convert between annoying spreadsheet reference formats. Some utility functions are exposed, such as A1_to_R1C1(), which converts from A1 formatted strings to R1C1, and letter_to_num(), which converts a Excel column ID to a number, e.g. column AQZ is more usefully known as column 1144.

Describing rectangles via cell_limits

cellranger provides an S3 class, cell_limits, as the standard way to store a cell range. You can explicitly construct a cell_limits object by specifying the upper left and lower right cells and, optionally, the hosting worksheet:

cell_limits(ul = c(ROW_MIN, COL_MIN), lr = c(ROW_MAX, COL_MAX), sheet = "SHEET")

Think of it like R3C1:R7C4 notation, but with the R and C removed.

More often you'll get a cell_limits object by sending diverse user input through as.cell_limits(). That's what's going on in calls like these from googlesheets:

library(googlesheets)
gs_read(..., range = "D12:F15")
gs_read(..., range = "raw_data!R1C12:R6C15")
gs_read(..., range = cell_limits(c(1, 1), c(6, 15)))
gs_read(..., range = cell_limits(c(2, 1), c(NA, NA)))
gs_read(..., range = cell_rows(1:100))
gs_read(..., range = cell_cols(3:8))
gs_read(..., range = cell_cols("B:MZ"))
gs_read(..., range = anchored("B4", dim = c(2, 10)))
gs_read(..., range = anchored("A1", dim = c(5, 6), col_names = TRUE))
## internal usage in functions that put data into a googlesheet
anchored(input = head(iris))
anchored(input = head(iris), col_names = FALSE)
anchored(input = head(LETTERS))
anchored(input = head(LETTERS), byrow = TRUE)

Read the docs for more information on some specialized helpers:

  • Row- or column-only specification: cell_rows(), cell_cols().
  • Specification via an object you want to write and, optionally, an anchor cell: anchored()
library("cellranger")
(cl <- as.cell_limits("raw_data!R1C12:R6C15"))
#> <cell_limits (1, 12) x (6, 15) in 'raw_data'>

The dim method reports dimensions of the targetted cell rectangle. as.range() converts a cell_limits object back into an Excel range.

dim(cl)
#> [1] 6 4

as.range(cl)
#> [1] "raw_data!R1C12:R6C15"

as.range(cl, fo = "A1", sheet = FALSE, strict = TRUE)
#> [1] "$L$1:$O$6"

Use NA to leave a limit unspecified, i.e. describe a degenerate rectangle

cell_limits(c(3, 2), c(7, NA))
#> <cell_limits (3, 2) x (7, -)>

If the maximum row or column is specified but the associated minimum is not, then it is set to 1.

cell_limits(c(NA, NA), c(3, 5))
#> <cell_limits (1, 1) x (3, 5)>

Utilities for spreadsheet annoyances

We've exposed utility functions which could be useful to anyone manipulating Excel-like references.

## convert character column IDs to numbers ... and vice versa
letter_to_num(c('AA', 'ZZ', 'ABD', 'ZZZ', ''))
#> [1]    27   702   732 18278    NA

num_to_letter(c(27, 702, 732, 18278, 0, -5))
#> [1] "AA"  "ZZ"  "ABD" "ZZZ" NA    NA

## convert between A1 and R1C1 cell references
A1_to_R1C1(c("$A$1", "$AZ$10"))
#> [1] "R1C1"   "R10C52"
A1_to_R1C1(c("A1", "AZ10"), strict = FALSE)
#> [1] "R1C1"   "R10C52"

R1C1_to_A1(c("R1C1", "R10C52"))
#> [1] "$A$1"   "$AZ$10"
R1C1_to_A1(c("R1C1", "R10C52"), strict = FALSE)
#> [1] "A1"   "AZ10"

## detect cell reference formats with
## is_A1() and is_R1C1()
x <- c("A1", "$A4", "$b$12", "RC1", "R[-4]C9", "R5C3")
data.frame(x, A1 = is_A1(x), R1C1 = is_R1C1(x))
#>         x    A1  R1C1
#> 1      A1  TRUE FALSE
#> 2     $A4  TRUE FALSE
#> 3   $b$12  TRUE FALSE
#> 4     RC1  TRUE  TRUE
#> 5 R[-4]C9 FALSE  TRUE
#> 6    R5C3 FALSE  TRUE

## guess format with
## guess_fo()
refs <- c("A1", "$A1", "A$1", "$A$1", "a1",
          "R1C1", "R1C[-1]", "R[-1]C1", "R[-1]C[9]")
data.frame(refs, guessed = guess_fo(refs))
#>        refs guessed
#> 1        A1      A1
#> 2       $A1      A1
#> 3       A$1      A1
#> 4      $A$1      A1
#> 5        a1      A1
#> 6      R1C1    R1C1
#> 7   R1C[-1]    R1C1
#> 8   R[-1]C1    R1C1
#> 9 R[-1]C[9]    R1C1

Functions in cellranger

Name Description
A1_to_R1C1 Convert cell reference strings from A1 to R1C1 format
addr_row Get row from cell location or reference
cell_cols Specify cell limits only for columns
addr_col Get column from cell location or reference
anchored Specify cell limits via an anchor cell
as.range Convert a cell_limits object to a cell range
as.cell_addr Convert to a cell_addr object
cell_addr cell_addr class
cell_limits Create a cell_limits object
as.ra_ref Convert to a ra_ref object
to_string Get string representation of cell references
letter-num-conversion Convert between letter and integer representations of column IDs
print.ra_ref Print ra_ref object
cellranger cellranger
ra_ref ra_ref class
cell_rows Specify cell limits only for rows
R1C1_to_A1 Convert R1C1 positioning notation to A1 notation
guess_fo Guess cell reference string format
is_A1 Test cell reference strings
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Details

License MIT + file LICENSE
LazyData true
URL https://github.com/rsheets/cellranger
BugReports https://github.com/rsheets/cellranger/issues
RoxygenNote 5.0.1.9000
VignetteBuilder knitr
NeedsCompilation no
Packaged 2016-07-26 06:50:00 UTC; jenny
Repository CRAN
Date/Publication 2016-07-27 03:17:48

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