Extracting certain values from columns

Hi Everyone,

I'm a R beginner and currently stuck.
I have multiple columns (lets name them x1, x2,x3, x4).
The column x1 contains values of 0s and 1s representing two different conditions.
The column x4 contains reaction times of the participants.
I want the code to give me a new value (e.g., z5) that gives me a list of the participant reaction times that occur on the same row as the 0s in the x1 column. Thus giving me all the reaction times for one of the conditions in the new value.

Thank you!!

See the FAQ: How to do a minimal reproducible example reprex for beginners to better chances of an answer that precisely addresses the specific question.

It looks that what is desired is to subset based on whether your_data$x1 is one or zero. Using the built-in mtcars dataset and substituting cyl of 4 for x1 of 0

mtcars[which(mtcars$cyl == 4),]
#>                 mpg cyl  disp  hp drat    wt  qsec vs am gear carb
#> Datsun 710     22.8   4 108.0  93 3.85 2.320 18.61  1  1    4    1
#> 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
#> Fiat 128       32.4   4  78.7  66 4.08 2.200 19.47  1  1    4    1
#> Honda Civic    30.4   4  75.7  52 4.93 1.615 18.52  1  1    4    2
#> Toyota Corolla 33.9   4  71.1  65 4.22 1.835 19.90  1  1    4    1
#> Toyota Corona  21.5   4 120.1  97 3.70 2.465 20.01  1  0    3    1
#> Fiat X1-9      27.3   4  79.0  66 4.08 1.935 18.90  1  1    4    1
#> Porsche 914-2  26.0   4 120.3  91 4.43 2.140 16.70  0  1    5    2
#> Lotus Europa   30.4   4  95.1 113 3.77 1.513 16.90  1  1    5    2
#> Volvo 142E     21.4   4 121.0 109 4.11 2.780 18.60  1  1    4    2