Coding > R Basics hands on The American School of Dubai DATABASE BASIC

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#Write your code here type conversation K<-2 if (class(K)!="integer") { K <- as.integer(K) print(K) } R Basics - Variables #Write your code here L<-as.Date('2018-01-01') get_next_leap_year <- function(L) { all_years <- L + 1:4 all_years[(all_years %% 4 == 0 & all_years %%100 != 0) | all_years %% 400 == 0] } LN <-get_next_leap_year(2018) print(LN) Conditional Operations - if/else #Write your code here Marks <- c(78,85,90) for (value in Marks) { if(value>=80){print("Above Average")}else{print("Average")} } Conditional Operations - which() #Write your code here M<-10:20 print(M) which(M>13 & M<16) Random Numbers in R #Write your code here V<-round(runif(10,0,1), 2) print(V ) ifelse(V<0.50,"Less","More") Factors and Levels #Write your code here a<-factor(c("yes","no","yes","maybe")) print(levels(a)) Vector Operations #Write your code here X<-1:5 Y<-seq(2,10,2) This study source was downloaded by 100000857952895 from CourseHero.com on 01-05-2023 10:12:46 GMT -06:00

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print(X*Y) Matrix Operations #Write your code here #Write your code here MM <- matrix(c(2,4,6,8,0,9),nrow = 2) print(MM) \ String and Date a <- '15081947' a <- as.Date(a,"%d%B%Y") POSIX Date #Write your code here test1 <- as.Date("15Aug1947", format="%d%b%Y") test2 <- strptime("15Aug2018", format="%d%b%Y") difftime(as.POSIXct(test2), as.POSIXct(test1), units="days") Conditional Operators-1 #Write your code here temp<-c(103,100,98) ifelse(temp>100,"hot","good") Iterations 1 #Write your code here findfactorial <- function(n){ factorial <- 1 if(n==0 | n==1){ factorial <- 1 } else{ while(n >= 1){ factorial <- factorial * n n <- n-1 } } return (factorial) } findfactorial(6) Iterations #Write your code here x <- 1:20 count <- 0 for (val in x) { count = count+val } print(count) which() #Write&nbspyour&nbspcode&nbsphere M<-c(98,102,120,145,175,169,118,177,101,200) print(M) which(M%%2==0) This study source was downloaded by 100000857952895 from CourseHero.com on 01-05-2023 10:12:46 GMT -06:00

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str() #Write&nbspyour&nbspcode&nbsphere emp�<-�data.frame( ���empno�=�11, ���emp_name�=�"Alex", ���age�=�32, ���dept�="sales" ) str(emp) Conditional Operations-2 #Write&nbspyour&nbspcode&nbsphere toppers<-sample(80:100,�10) print(toppers) ifelse(toppers>90,"best&nbspclass","needs&nbspimprovements") for�(val�in�toppers)�{ �if(val>90){ ��print("best&nbspclass") �}else �{ ���print("needs&nbspimprovements") �} }

User Defined Functions #Write&nbspyour&nbspcode&nbsphere pyth�<-�function(a,�b){ hypotenuse�<-�sqrt(a^2�+�b^2) return(hypotenuse) } pyth(3,4) Date and Time in R #Write&nbspyour&nbspcode&nbsphere a�<-�'25-12-2016' a�<-�as.Date(a,"%d-%m-%Y") print(a�) for() Loops in R #Write&nbspyour&nbspcode&nbsphere X=80:100 tot<-0 for�(val�in�X)�{ ��if(val%%2==0){ tot<-tot+val ��} } print(tot) Vectors in R #Write&nbspyour&nbspcode&nbsphere V1<-1:5 This study source was downloaded by 100000857952895 from CourseHero.com on 01-05-2023 10:12:46 GMT -06:00

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V2<-c(10,20,30,40,50) print(V1+V2) Vectors and Matrices #Write&nbspyour&nbspcode&nbsphere V<-1:9 M�<-�matrix(V,�nrow�=�3,�byrow�=�TRUE) print(M*2) Handling 'NA' #Write&nbspyour&nbspcode&nbsphere V<-c(1,4,NA,7,9,NA,2) x<-V[!is.na(V)&�(V�%%�2�==�0)] print(x) Categorical to Numeric Variable in R #Write&nbspyour&nbspcode&nbsphere v1�<-�factor(sample(�10)) print(v1) v2<-as.numeric(v1) print(v2) v3<-v1==v2 print(v3) �Set Operations in R #Write&nbspyour&nbspcode&nbsphere A<-11:16 B<-13:20 setdiff(A,B) Descriptive Statistics in R #Write&nbspyour&nbspcode&nbsphere A<-11:17 median(A)

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