Question
In: Statistics and Probability
Some questions to orientate yourself. (a) Use the function class to find the class to which...
Some questions to orientate yourself.
(a) Use the function class to find the class to which the
follow- ing objects belong: golub, golub[1,1],golub.cl,
golub.gnames, apply, exp, gol.fac, plot, ALL.
(b) What is the meaning of the following abbreviations: rm,
sum, prod, seq, sd, nrow.
(c) For what purpose are the following functions useful: grep,
apply, gl, library, source, setwd, history, str.
Solutions
Expert Solution
a. Note : This question is based on a particular object, please provide the data file.
b) What is the meaning of the following abbreviations:
rm - remove : Remove an object from the environment.
sum - summation : Addition of a number
prod - product
seq - sequence
sd - standard deviation
nrow - no of rows.
(c) For what purpose are the following functions useful:
grep - it is used to change if a string contains a particular
string or character.
apply - it is used to apply a particular function over all the rows or columns as defined by the user.
gl helps to generate factors by indicating the pattern of their levels.
library - It is used to load a particular package in the current R session.
source - using this command you can call another R script into the current R session.
setwd - helps you set the current working directory.
history - It helps to recall the last 25 commands that were used.
str - it give you the structure of the dataframe or the Robject.
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