Compress a vector or data frame

syncing_df_compress(
  x,
  newLength,
  sep = " ",
  compressFun = NULL,
  compressFunPart = NULL,
  silent = rock::opts$get("silent")
)

syncing_vector_compress(
  x,
  newLength,
  sep = " ",
  compressFun = NULL,
  compressFunPart = NULL,
  silent = rock::opts$get("silent")
)

Arguments

x: The vector or data frame
newLength: The new length (or number of rows for a data frame)
sep: When not specifying compressFun and compressFunPart, the paste function is used to combine elements, and in that case, sep is passed to paste as separator.
compressFun: If specified, when compressing streams, instead of pasting elements together using separator sep, the vectors are passed to function compressFun, which must accept a vector (to compress) and a single integer (with the desired resulting length of the vector).
compressFunPart: A function to apply to the segments that are automatically created; this can be passed instead of compressFun.
silent: Whether to be silent or chatty.

Value

The compressed vector or data frame

Examples

rock::syncing_vector_compress(
  1:10,
  3
);
#> [1] "1 2 3"   "4 5 6 7" "8 9 10" 

rock::syncing_df_compress(
  mtcars[, 1:4],
  6
);
#>                             mpg         cyl                            disp
#> 1          21 21 22.8 21.4 18.7   6 6 4 6 8             160 160 108 258 360
#> 2 18.1 14.3 24.4 22.8 19.2 17.8 6 8 4 4 6 6 225 360 146.7 140.8 167.6 167.6
#> 3      16.4 17.3 15.2 10.4 10.4   8 8 8 8 8       275.8 275.8 275.8 472 460
#> 4      14.7 32.4 30.4 33.9 21.5   8 4 4 4 4        440 78.7 75.7 71.1 120.1
#> 5   15.5 15.2 13.3 19.2 27.3 26 8 8 8 8 4 4        318 304 350 400 79 120.3
#> 6        30.4 15.8 19.7 15 21.4   4 8 6 8 4            95.1 351 145 301 121
#>                      hp
#> 1    110 110 93 110 175
#> 2 105 245 62 95 123 123
#> 3   180 180 180 205 215
#> 4       230 66 52 65 97
#> 5 150 150 245 175 66 91
#> 6   113 264 175 335 109

rock::syncing_df_compress(
  mtcars[, 1:4],
  6,
  compressFunPart = mean
);
#>        mpg      cyl     disp       hp
#> 1 20.98000 6.000000 209.2000 119.6000
#> 2 19.43333 5.666667 201.2833 125.5000
#> 3 13.94000 8.000000 351.8800 192.0000
#> 4 26.58000 4.800000 157.1200 102.0000
#> 5 19.41667 6.666667 261.8833 146.1667
#> 6 20.46000 6.000000 202.6200 199.2000