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Exercise

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.

Instructions
100 XP

  • 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.

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