openxlsx2 (version 0.8)

wb_dims: Helper to specify the dims argument

Description

wb_dims() can be used to help provide the dims argument, in the wb_add_* functions. It returns a A1 spreadsheet range ("A1:B1" or "A2"). It can be very useful as you can specify many parameters that interact together In general, you must provide named arguments. wb_dims() will only accept unnamed arguments if they are rows, cols, for example wb_dims(1:4, 1:2), that will return "A1:B4".

wb_dims() can also be used with an object (a data.frame or a matrix for example.) All parameters are numeric unless stated otherwise.

Usage

wb_dims(..., select = NULL)

Value

A dims string

Arguments

...

construct dims arguments, from rows/cols vectors or objects that can be coerced to data frame. x, rows, cols, from_row, from_col, row_names, and col_names are accepted.

select

A string, one of the followings. it improves the selection of various parts of x One of "x", "data", "col_names", or "row_names". "data" will only select the data part, excluding row names and column names (default if cols or rows are specified) "x" Includes the data, column and row names if they are present. (default if none of rows and cols are provided) "col_names" will only return column names "row_names" Will only return row names.

Using <code>wb_dims()</code> without an <code>x</code> object

• rows / cols (if you want to specify a single one, use from_row / from_col)

• from_row / from_col the starting position of the dims (similar to start_row / start_col, but with a clearer name.)

Using <code>wb_dims()</code> with an <code>x</code> object

wb_dims() with an object has 8 use-cases (they work with any position values of from_row / from_col), from_col/from_row correspond to the coordinates at the top left of x including column and row names if present.

These use cases are provided without from_row / from_col, but they work also with from_row / from_col.

1. provide the full grid with wb_dims(x = mtcars)

2. provide the data grid wb_dims(x = mtcars, select = "data")

3. provide the dims of column names wb_dims(x = mtcars, select = "col_names)

4. provide the dims of row names wb_dims(x = mtcars, row_names = TRUE, select = "row_names")

5. provide the dims of a row span wb_dims(x = mtcars, rows = 1:10) selects the first 10 data rows of mtcars (ignoring column names)

6. provide the dims of the data in a column span wb_dims(x = mtcars, cols = 1:5) select the data first 5 columns of mtcars

7. provide a column span (including column names) wb_dims(x = mtcars, cols = 4:7, select = "x") select the data columns 4, 5, 6, 7 of mtcars + column names

8. provide the position of a single column by name wb_dims(x = mtcars, cols = "mpg").

9. provide a row span with a column. wb_dims(x = mtcars, cols = "mpg", rows = 5:22)

To reuse, a good trick is to create a wrapper function, so that styling can be performed seamlessly.

wb_dims_cars <- function(...) {
  wb_dims(x = mtcars, from_row = 2, from_col = "B", ...)
}
# using this function
wb_dims_cars()                     # full grid (data + column names)
wb_dims_cars(select = "data")      # data only
wb_dims_cars(select = "col_names") # select column names
wb_dims_cars(cols = "vs")          # select the `vs` column

It can be very useful to apply many rounds of styling sequentially.

Details

When using wb_dims() with an object, the default behavior is to select only the data / row or columns in x If you need another behavior, use wb_dims() without supplying x.

• x An object (typically a matrix or a data.frame, but a vector is also accepted.)

• from_row / from_col the starting position of x (The dims returned will assume that the top left corner of x is at from_row / from_col

• rows Optional Which row span in x should this apply to. If rows = 0, only column names will be affected.

• cols a range of columns id in x, or one of the column names of x (length 1 only accepted for column names of x.)

• row_names A logical, this is to let wb_dims() know that x has row names or not. If row_names = TRUE, wb_dims() will increment from_col by 1.

• col_names wb_dims() assumes that if x has column names, then trying to find the dims.

wb_dims() tries to support most possible cases with row_names = TRUE and col_names = FALSE, but it works best if x has named dimensions (data.frame, matrix), and those parameters are not specified. data with column names, and without row names. as the code is more clean.

In the add_data() / add_font() example, if writing the data with row names

Examples

# Provide coordinates
wb_dims(1, 4)
wb_dims(rows = 1, cols = 4)
wb_dims(from_row = 4)
wb_dims(from_col = 2)
wb_dims(from_col = "B")
wb_dims(1:4, 6:9, from_row = 5)
# Provide vectors
wb_dims(1:10, c("A", "B", "C"))
wb_dims(rows = 1:10, cols = 1:10)
# provide `from_col` / `from_row`
wb_dims(rows = 1:10, cols = c("A", "B", "C"), from_row = 2)
wb_dims(rows = 1:10, cols = 1:10, from_col = 2)

# or objects
wb_dims(x = mtcars, col_names = TRUE)

# select all data
wb_dims(x = mtcars, select = "data")

# column names of an object (with the special select = "col_names")
wb_dims(x = mtcars, select = "col_names")


# dims of the column names of an object
wb_dims(x = mtcars, select = "col_names", col_names = TRUE)

## add formatting to `mtcars` using `wb_dims()`----
wb <- wb_workbook()
wb$add_worksheet("test wb_dims() with an object")
dims_mtcars_and_col_names <- wb_dims(x = mtcars)
wb$add_data(x = mtcars, dims = dims_mtcars_and_col_names)

# Put the font as Arial for the data
dims_mtcars_data <- wb_dims(x = mtcars, select = "data")
wb$add_font(dims = dims_mtcars_data, name = "Arial")

# Style col names as bold using the special `select = "col_names"` with `x` provided.
dims_column_names <- wb_dims(x = mtcars, select = "col_names")
wb$add_font(dims = dims_column_names, bold = TRUE, size = 13)

# Finally, to add styling to column "cyl" (the 4th column) (only the data)
# there are many options, but here is the preferred one
# if you know the column index, wb_dims(x = mtcars, cols = 4) also works.
dims_cyl <- wb_dims(x = mtcars, cols = "cyl")
wb$add_fill(dims = dims_cyl, color = wb_color("pink"))

# Mark a full column as important(with the column name too)
wb_dims_vs <- wb_dims(x = mtcars, cols = "vs", select = "x")
wb$add_fill(dims = wb_dims_vs, fill = wb_color("yellow"))
wb$add_conditional_formatting(dims = wb_dims(x = mtcars, cols = "mpg"), type = "dataBar")
# wb_open(wb)