R Codes
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Courtesy: Dr. Jafor Ahmed Khan
Profesor, Dept. of Statistics, Biostatistics & Informatics, University of Dhaka
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Code  Purpose 
2+2  Add 2 with 2 
1:10  Get values 1 thru 10 
201:300  Get values 201 thru 300 
a=2  Assign value of a to 2.
Note: This does not mean a is equal to 2. That purpose is met by a==2. 
a  Know assigned value of a 
b=3  Assign value of b to 2. 
a*b  Multiply a with b 
a^b  a to the power b 
log(a)  Log of a
Note: By default log is natural i.e. with base e which we call ln. That is the code log(2) is tantamount to ln(2). Keep in mind that ln(2) is unavailable in R. 
log(2)  Log of 2 
exp(1)  e to the power 1. 
?log  Get help about log.
To get other help topics, type similarly like ?sum 
log (x, base=7)  Usual format for value of log (x) with base 7 
log (base=10, x=a)  Detail format of log 
log (a,10)  Shortcut format for log 
choose (12, 8)  Number of possible combinations of taking 8 object out of 12. That is, it’s analogous to ^{12}C_{8} 
gamma(5)  Value of Γ5 that is, 4! 
factorial (8)  8! i.e. 8 factorial 
exp (2.3)  e^{2.3} 
sqrt (8.4)  Square root of 9.4 
beta (2,3) 
B(a,b) = Γ(a)Γ(b)/Γ(a+b).

round(2.34)  Rounding 
round(2.34567, 4)  Rounding up to 4 decimal 
pi  3.1416… i.e. value of π 
abs (2)  Absolute value of (2) 
class (b)  See the type of object b 
class (log)  See class of log 
sqrt (beta(7,9))  Square root of this beta value 
log(17) +1  Same as code 
Profesor, Dept. of Statistics, Biostatistics & Informatics, University of Dhaka
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