Logical expressions and subsets
Logical expressions which use the and (&), or (|), not (!), etc. operators are a powerful tool when creating more complicated filters based on certain criteria.
In this exercise, you'll combine several 'relational operators' – equals-to (==), less than (<), greater than or equal to (>=), etc. – to write an expression that determines if the index of the maunaloa dataset falls within a certain range. You'll then take that expression and use it to extract the observations of maunaloa within that range.
Deze oefening maakt deel uit van de cursus
Manipulating Time Series Data in R
Oefeninstructies
Write a logical expression for if the index of
maunaloais greater than or equal to1990and if the index is less than or equal to2010; assign this tosubset.Use square brackets (
[and]) to extract values frommaunaloathat match the expression defined insubsetand assign the result tomaunaloa_subset.Generate an autoplot of
maunaloa_subset.
Praktische interactieve oefening
Probeer deze oefening eens door deze voorbeeldcode in te vullen.
# Complete the logical expression
subset <- ___ &
___
# Extract the subset of maunaloa
___ <- ___
# Autoplot the subsetted maunaloa dataset
___