Loop Through Data Frame Columns & Rows in R (4 Examples) | for-, while- & repeat-Loops | Add Values

Published: 14 April 2023
on channel: Statistics Globe

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How to loop over the variables and rows of a data matrix in the R programming language. More details: https://statisticsglobe.com/loop-thro...
R code of this video:

data ＜- data.frame(x1 = 1:5, # Create example data
x2 = 6:10,
x3 = 11:15)
data # Print example data

data1 ＜- data # Replicate example data

for(i in 1:ncol(data1)) { # for-loop over columns
data1[ , i] ＜- data1[ , i] + 10
}

data1 # Print updated data

data2 ＜- data # Replicate example data

for(i in 1:nrow(data2)) { # for-loop over rows
data2[i, ] ＜- data2[i, ] - 100
}

data2 # Print updated data

data3 ＜- data # Replicate example data

i ＜- 1 # Create running index

while(i ＜=2) { # Start while-loop
data3[ , i] ＜- data3[ , i] + 100
i ＜- i + 1
}

data3 # Print updated data

data4 ＜- data # Replicate example data

i ＜- 1 # Create running index

repeat{ # Start repeat-loop

data4[ , i] ＜- data4[ , i] + 100
i ＜- i + 1

if(i ＞ 2) {

break
}
}

data4 # Print updated data

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