Skip to content

Functions

Summary of used functions in the course sorted by the order of appearance in the course.

General functions

  • round() - round a number to a specified number of decimal places

  • abs() - absolute value of a number

  • typeof() - type of the object

  • as.*() - conversion between data types
  • c() - combine values into vector
  • length() - length of vector

  • min(),max(), mean(), sum() - calculate descriptive statistics of numeric vector

  • read.csv() - read a CSV file and create a data frame

  • write.csv() - write a data frame to a CSV file
  • is.na() - return logical vector of TRUE and FALSE values, where TRUE means that the value is NA
  • table() - count the unique values of a vector

  • unique() - return unique values of a vector

  • install.packages() - install packages from CRAN

  • library() - load package in session

  • names() - return the names of the columns in a data frame

  • plot(), hist(), barplot() - basic plots

Spatial functions - sf package

  • st_read() - read a spatial file and create an sf object
  • st_bbox() - calculate the bounding box of the geometries
  • st_crs() - return the coordinate reference system of the data
  • st_transform() - transform the data to another coordinate reference system
  • st_area() - calculate the area of the geometries
  • st_perimeter() - calculate the perimeter of the geometries
  • st_write() - write an sf object to a spatial file