R slicing of a data frame

[avasquez22]

If I have a df with 30 rows and 10 columns, and I want to create a new data frame by slicing, what would be the output if I apply the following code? How many rows would produce?

new_df<- df [c(1:13),]

I am confused with this question

[technocrat]

@avasquez22

new_df<- df [c(1:13),]

dim(mtcars)
#> [1] 32 11
# rows first, can be a single or sequence but if not continuous by index
# must be c(1,2,3,6,) like
# columns second: if only selecting column can do dat[2:6] or dat[,2:6]
(new_df<- mtcars[1:13,])
#>                    mpg cyl  disp  hp drat    wt  qsec vs am gear carb
#> Mazda RX4         21.0   6 160.0 110 3.90 2.620 16.46  0  1    4    4
#> Mazda RX4 Wag     21.0   6 160.0 110 3.90 2.875 17.02  0  1    4    4
#> Datsun 710        22.8   4 108.0  93 3.85 2.320 18.61  1  1    4    1
#> Hornet 4 Drive    21.4   6 258.0 110 3.08 3.215 19.44  1  0    3    1
#> Hornet Sportabout 18.7   8 360.0 175 3.15 3.440 17.02  0  0    3    2
#> Valiant           18.1   6 225.0 105 2.76 3.460 20.22  1  0    3    1
#> Duster 360        14.3   8 360.0 245 3.21 3.570 15.84  0  0    3    4
#> Merc 240D         24.4   4 146.7  62 3.69 3.190 20.00  1  0    4    2
#> Merc 230          22.8   4 140.8  95 3.92 3.150 22.90  1  0    4    2
#> Merc 280          19.2   6 167.6 123 3.92 3.440 18.30  1  0    4    4
#> Merc 280C         17.8   6 167.6 123 3.92 3.440 18.90  1  0    4    4
#> Merc 450SE        16.4   8 275.8 180 3.07 4.070 17.40  0  0    3    3
#> Merc 450SL        17.3   8 275.8 180 3.07 3.730 17.60  0  0    3    3

^{Created on 2022-11-13 by the reprex package (v2.0.1)}