Welcome to your first training session!
\nNo need to be nervous: this page contains not only tasks, but also their solutions as folded code elements. You can unfold these code blocks by simply clicking on them. Give it a try:<\/p>\n
\r\n# Well done!\r\n\r\n# Spoiler! - you will find your answer here\r\n<\/pre>\n1) Create a variable called a<\/span> and assign the number 2017<\/em> to it!<\/p>\n
\r\n# use the \"<-" operator for variable assignments:\r\na <- 2017\r\n<\/pre>\n2) Calculate the square root of 1089 and save the result in variable b<\/span>!<\/p>\n
\r\n# use the built- in function \"sqrt()\" and the number 1089 as an argument:\r\nb <- sqrt(1089)\r\n<\/pre>\n3) Calculate the sum of a<\/span> and b<\/span>!<\/p>\n
\r\n# done via standard operators:\r\na + b\r\n## [1] 2050\r\n<\/pre>\n4) Overwrite variable a<\/span> by assigning the value 2018 to it!<\/p>\n
\r\n# simply assign a new value to an existing variable in order to overwrite it\r\na <- 2018\r\n<\/pre>\n5) Make a copy of variable b<\/span> and name it c<\/span>!<\/p>\n
\r\n# variable assignment works from right (existing variable) to left (new variable):\r\nc <- b\r\n<\/pre>\n6) Create your own function called my.fun()<\/span>, which requires three variables as input. The function should generate the square root of the product of all three variables and return one numeric value!<\/p>\n
\r\nmy.fun <- function( var1, var2, var3 ) {\r\n result <- sqrt( var1 * var2 * var3 )\r\n return(result)\r\n}\r\n<\/pre>\n7) Use a<\/span>, b<\/span> and c<\/span> (from the previous tasks) as input into my.fun()<\/span> and save the output to variable d<\/span>! Check the resulting value!<\/p>\n
\r\nd <- my.fun(a, b, c)\r\nd\r\n## [1] 1482.431\r\n<\/pre>\n<\/p>\n
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