R Programming · all questions

Control Structures in R Programming
practice.

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Q141

Which function helps you perform sorting in R language?

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Q142

What will be the output of the following R code?

> f <- function(num) {
+ for(i in seq_len(num)) {
+               cat("Hello, world!\n")
+ }
+ }
> f(3)

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Q143

. . . . . . . . is used to apply a function over subsets of a vector.

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Q144

Which of the variable in the following R code is variable?

> f <- function(x, y) {
+            x^2 + y / z
+ }

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Q145

What will be the output of the following R code?

function(p) {
          params[!fixed] <- p
          mu <- params[1]
          sigma <- params[2]
## Calculate the Normal density
          a <- -0.5*length(data)*log(2*pi*sigma^2)
          b <- -0.5*sum((data-mu)^2) / (sigma^2)
          -(a + b)
}
> ls(environment(nLL))

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Q146

. . . . . . . . initiates an infinite loop right from the start.

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Q147

What will be the output of runif()?

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Q148

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

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

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Q149

. . . . . . . . will produce a sequential vector c( (1,2,3,4,5,6,7,8,9)).

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Q150

What are the different types of sorting algorithms available in R language?

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Q151

What is the memory limit in R for 32 bit system?

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Q152

What will be the output of the following R code?

> nLL <- make.NegLogLik(normals, c(1, FALSE))
> optimize(nLL, c(1e-6, 10))$minimum

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Q153

. . . . . . . . variables are categorical variables which can hold either string or numeric values.

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Q154

. . . . . . . . measures the probability of the binary response variable in R language.

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Q155

. . . . . . . . is the best way for communicating the results of data analysis using the R language.

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Q156

Which function is difficult to implement?

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Q157

. . . . . . . . allows you to modify the error behavior so that you can browse the function call stack

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Q158

Which of the following is primary tool for debugging?

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Q159

Point out the correct statement?

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Q160

How will you check if an element is present in a vector?

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