R Programming · all questions

Control Structures in R Programming
practice.

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Q161

What will be the output of the following R code?

> x <- 3
> switch(2, 2+2, mean(1:10), rnorm(5))

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Q162

What will be the output of the following R code snippet?

> f <- function(num = 1) {
+        hello <- "Hello, world!\n"
+        for(i in seq_len(num)) {
+                cat(hello)
+         }
+         chars <- nchar(hello) * num
+         chars
+ }
> f()

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Q163

. . . . . . . . function can be used to select the random sample of size 'n' from a huge dataset.

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Q164

. . . . . . . . package in R language provides various options for re-randomization and permutations based on statistical tests.

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Q165

. . . . . . . . can be used for storing the data for long-term.

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Q166

What will be the output of the following R code?

> g <- function(x) {
+               a <- 3
+               x+a+y
+             ## 'y' is a free variable
+ }
> y <- 3
> g(2)

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Q167

What is the memory limit in R for 64 bit system?

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Q168

Which of the following code will print NULL?

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Q169

The current user defined objects like lists, vectors, etc. is referred to as . . . . . . . . in the R language.

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Q170

If two vectors with different lengths perform some operation, the elements of the shorter vector will be used again to complete the operation. This is referred to as . . . . . . . .

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Q171

Point out the wrong statement?

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Q172

Which of the following R code can be used to avoid numeric problems such as taking the logarithm of a negative number?

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Q173

debug() flags a function for . . . . . . . . mode in R mode.

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Q174

You can check to see whether an R object is NULL with the . . . . . . . . function.

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Q175

What will be the output of the following R expression?

> log(-2.3)

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Q176

Point out the correct statement?

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Q177

What will be the output of the following R code?

> printmessage <- function(x) {
+     if(x > 0)
+          print("x is greater than zero")
+     else
+          print("x is less than or equal to zero")
+     invisible(x)
+ }
> printmessage(NA)

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Q178

A . . . . . . . . in R programming language can also contain numeric and alphabets along with special characters like dot and underline.

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Q179

What will be the output of the following R code?

> nLL <- make.NegLogLik(normals, c(FALSE, 2))
> optimize(nLL, c(-1, 3))$minimum

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Q180

How do you create log linear models in R language?

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