Shift a LazyFrame

Source code

Description

Shift the values by a given period. If the period (n) is positive, then n rows will be inserted at the top of the LazyFrame and the last n rows will be discarded. Vice-versa if the period is negative. In the end, the total number of rows of the LazyFrame doesn’t change.

Usage

<LazyFrame>$shift_and_fill(fill_value, periods = 1)

Arguments

fill_value	Fill new NULL values with this value. Must of length 1. A logical value will be converted to numeric.
periods	Number of periods to shift (can be negative).

Value

LazyFrame

Examples

library(polars)

pl$LazyFrame(mtcars)$shift_and_fill(0., 2.)$collect()$to_data_frame()

#>     mpg cyl  disp  hp drat    wt  qsec vs am gear carb
#> 1   0.0   0   0.0   0 0.00 0.000  0.00  0  0    0    0
#> 2   0.0   0   0.0   0 0.00 0.000  0.00  0  0    0    0
#> 3  21.0   6 160.0 110 3.90 2.620 16.46  0  1    4    4
#> 4  21.0   6 160.0 110 3.90 2.875 17.02  0  1    4    4
#> 5  22.8   4 108.0  93 3.85 2.320 18.61  1  1    4    1
#> 6  21.4   6 258.0 110 3.08 3.215 19.44  1  0    3    1
#> 7  18.7   8 360.0 175 3.15 3.440 17.02  0  0    3    2
#> 8  18.1   6 225.0 105 2.76 3.460 20.22  1  0    3    1
#> 9  14.3   8 360.0 245 3.21 3.570 15.84  0  0    3    4
#> 10 24.4   4 146.7  62 3.69 3.190 20.00  1  0    4    2
#> 11 22.8   4 140.8  95 3.92 3.150 22.90  1  0    4    2
#> 12 19.2   6 167.6 123 3.92 3.440 18.30  1  0    4    4
#> 13 17.8   6 167.6 123 3.92 3.440 18.90  1  0    4    4
#> 14 16.4   8 275.8 180 3.07 4.070 17.40  0  0    3    3
#> 15 17.3   8 275.8 180 3.07 3.730 17.60  0  0    3    3
#> 16 15.2   8 275.8 180 3.07 3.780 18.00  0  0    3    3
#> 17 10.4   8 472.0 205 2.93 5.250 17.98  0  0    3    4
#> 18 10.4   8 460.0 215 3.00 5.424 17.82  0  0    3    4
#> 19 14.7   8 440.0 230 3.23 5.345 17.42  0  0    3    4
#> 20 32.4   4  78.7  66 4.08 2.200 19.47  1  1    4    1
#> 21 30.4   4  75.7  52 4.93 1.615 18.52  1  1    4    2
#> 22 33.9   4  71.1  65 4.22 1.835 19.90  1  1    4    1
#> 23 21.5   4 120.1  97 3.70 2.465 20.01  1  0    3    1
#> 24 15.5   8 318.0 150 2.76 3.520 16.87  0  0    3    2
#> 25 15.2   8 304.0 150 3.15 3.435 17.30  0  0    3    2
#> 26 13.3   8 350.0 245 3.73 3.840 15.41  0  0    3    4
#> 27 19.2   8 400.0 175 3.08 3.845 17.05  0  0    3    2
#> 28 27.3   4  79.0  66 4.08 1.935 18.90  1  1    4    1
#> 29 26.0   4 120.3  91 4.43 2.140 16.70  0  1    5    2
#> 30 30.4   4  95.1 113 3.77 1.513 16.90  1  1    5    2
#> 31 15.8   8 351.0 264 4.22 3.170 14.50  0  1    5    4
#> 32 19.7   6 145.0 175 3.62 2.770 15.50  0  1    5    6