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R Codes: part-2
Courtesy
: Dr. Jafar Ahmed Khan
Profesor, Dept. of Statistics, Biostatistics & Informatics, University of Dhaka
R Codes: part-2
Purpose | Purpose |
X = c(1,3,5) | To make a vector with values 1, 3 & 5. |
X= scan () | Press enter. Then put values and again enter when all desired values are given. |
X = seq (2,5,1) | Values 2 thru 5 with interval 1. |
Rm(x) | To delete a command, say x, from memory |
X = 1: 10 | Assigning values 1 thru 10 to x. |
Rep (1, 10) | Output 1 ten times. |
Floor (2.3) | To make it 2 |
Floor(2.9) | To make it 2.
That is, by using ‘floor’, you are going backwards i.e. to the previous numbers while rounding |
Ceiling (2.3) | To make it 3 |
Ceiling (2.9) | To make it 3.
That is, by using ‘ceiling, you are going forward while rounding i.e. to the previous numbers while rounding |
Round (2.3) | Normal rounding |
Round(2.9) | Normal rounding |
Trunc(2.3) | Rounding and getting integer i.e. vanishing decimal |
Trunc(2.9) | Rounding and getting integer i.e. vanishing decimal |
X = runif(10000, -1,1) | To take a sample from uniform distribution over the interval (-1,1) |
X= runif(10000,1,4) | Generating normal distribution with mean 1 and variance 4. |
Var(x) | Variance of a distribution |
Mean(x) | Get mean |
Sort(x) | Arrange in ascending order |
Sort(x, descending=F) | Arrange in descending order |
Sort(x,T) | Arrange in descending order |
X+1 | If x is a vector, then x+1 command adds 1 to every value of the vector. |
x-y | Subtract corresponding elements of one vector from another when x & y are vectors. Otherwise just values. |
x/y | “ |
X[3] | 3^{rd} value of a vector x. It’s applicable when a vector contains a lot of elements. |
X[3] = 7 | Convert 3^{rd} value of a vector x into 7 |
x= c[1:10) | A vector from elements 1 thru 10. |
X[c(5,6,70}= 0 | 5^{th} ,6^{th} &7^{th} equating to 0 |
X[5:7] = 0 | Same as above |
X[c(5,6,70}= c(10, 11, 12) | equating 5^{th} ,6^{th} &7^{th} to 10, 11 & 12 respectively |
Profesor, Dept. of Statistics, Biostatistics & Informatics, University of Dhaka
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