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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.

Cet exercice fait partie du cours

Manipulating Time Series Data in R

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Instructions

  • Write a logical expression for if the index of maunaloa is greater than or equal to 1990 and if the index is less than or equal to 2010; assign this to subset.

  • Use square brackets ([ and ]) to extract values from maunaloa that match the expression defined in subset and assign the result to maunaloa_subset.

  • Generate an autoplot of maunaloa_subset.

Exercice interactif pratique

Essayez cet exercice en complétant cet exemple de code.

# Complete the logical expression
subset <- ___ &
          ___

# Extract the subset of maunaloa
___ <- ___

# Autoplot the subsetted maunaloa dataset
___
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