Annotation of numbers

To get a handle on using paste(), you are going to annotate some of your formatted number strings.

The key points to remember are:

The vectors you pass to paste() are pasted together element by element, using the sep argument to combine them.
If the vectors passed to paste() aren't the same length, the shorter vectors are recycled up to the length of the longest one.
Only use collapse if you want a single string as output. collapse specifies the string to place between different elements.

Este exercício faz parte do curso

String Manipulation with stringr in R

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Instruções do exercício

We've put the formatted vectors pretty_income and pretty_percent in your workspace along with years.

Paste a $ to the front of each value in pretty_income, use sep = "", so there is no space between the $ and value.
Paste a % to the end of each value in pretty_percent, use sep = "", so there is no space between the value and the %.
years contains the year each pretty_percent corresponds to. Use paste() to produce a vector with elements like 2010: +4.0% and assign it to year_percent.
Use paste() with year_percent to create single string that collapses all the years: 2010: +4.0%, 2011: -1.9%, 2012: +3.0%, 2013: -5.0%.

Exercício interativo prático

Experimente este exercício completando este código de exemplo.

# Add $ to pretty_income
___
 
# Add % to pretty_percent
___

# Create vector with elements like 2010: +4.0%`
year_percent <- ___

# Collapse all years into single string
___

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