Handle Error in R: Replacement has X Rows Data has Y (2 Examples)

In this tutorial, I’ll explain how to deal with the error message “replacement has X rows, data has Y” in the R programming language.

Creation of Example Data

data(iris)                                         # Example data
head(iris)
#   Sepal.Length Sepal.Width Petal.Length Petal.Width Species
# 1          5.1         3.5          1.4         0.2  setosa
# 2          4.9         3.0          1.4         0.2  setosa
# 3          4.7         3.2          1.3         0.2  setosa
# 4          4.6         3.1          1.5         0.2  setosa
# 5          5.0         3.6          1.4         0.2  setosa
# 6          5.4         3.9          1.7         0.4  setosa

Example 1: Replicating the Error Message: Replacement has X Rows, Data has Y

iris$new[which(iris$Sepal.Length < 5)] <- "small"  # Creating new variables doesn't work
# Error in `$<-.data.frame`(`*tmp*`, new, value = c(NA, "small", "small",  : 
#   replacement has 107 rows, data has 150

Example 2: Solving the Error Message: Replacement has X Rows, Data has Y

iris$new <- NA                                     # Creating empty new variable first
iris$new[which(iris$Sepal.Length < 5)] <- "small"  # Adding values to variable
head(iris)                                         # Showing head of updated data in console
# Sepal.Length Sepal.Width Petal.Length Petal.Width Species   new
# 1          5.1         3.5          1.4         0.2  setosa  <NA>
# 2          4.9         3.0          1.4         0.2  setosa small
# 3          4.7         3.2          1.3         0.2  setosa small
# 4          4.6         3.1          1.5         0.2  setosa small
# 5          5.0         3.6          1.4         0.2  setosa  <NA>
# 6          5.4         3.9          1.7         0.4  setosa  <NA>

Further Resources & Related Tutorials

You may find some related R programming tutorials on topics such as vectors, extracting data, and coding errors in the following list:

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