R Replacement Warning: Items to Replace not Multiple Length (2 Examples)

This tutorial shows how to handle the warning “number of items to replace is not a multiple of replacement length” in R programming.

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 Warning – number of items not multiple of length

iris$Sepal.Length[iris$Sepal.Length > 6] <-    # Replacement is too long
  iris$Sepal.Width
# Warning message:
# In iris$Sepal.Length[iris$Sepal.Length > 6] <- iris$Sepal.Width :
#   number of items to replace is not a multiple of replacement length

Example 2: Solving the Warning – number of items not multiple of length

iris$Sepal.Length[iris$Sepal.Length > 6] <-    # Replacement has identical length
  iris$Sepal.Width[iris$Sepal.Length > 6]

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