R create list of integers

A list in R is a specific type of vector with the difference that it can store mixed types like numbers, strings, vectors, another list, a matrix, or even a function as its elements. Decimal values are called numerics in R. It is the default computational data type of R. If we assign a decimal value to a variable then it will be of numeric type. If we assign an integer to a variable, it is still being saved as a numeric value.

Convert R List to Numeric Value

To convert R List to Numeric value, use the combination of the unlist[] function and as.numeric[] function. The unlist[] function in R produces a vector that contains all the atomic components. To convert factorial value to numeric value in R, use the as.numeric[] function.

Code snippet for converting list to numeric value

The data is the list consists of vectors.

The first thing we will define is vectors.

Then use the list[] function to create a list from vectors.

rv1 >> l = list[range[10]] >>> l [0, 1, 2, 3, 4, 5, 6, 7, 8, 9]

To create a list of integers between N and M [with M>N], the function range[] can still be used:

>>> l = [i for i in range[25,35]] >>> l [25, 26, 27, 28, 29, 30, 31, 32, 33, 34] >>> l = list[range[25,35]] >>> l [25, 26, 27, 28, 29, 30, 31, 32, 33, 34]

Create a list of floats using arange

To create a list of floats between [N,M] with a given step, a solution is to use the numpy function called arange:

>>> import numpy as np >>> l = [i for i in np.arange[2,8,0.5]] >>> l [2.0, 2.5, 3.0, 3.5, 4.0, 4.5, 5.0, 5.5, 6.0, 6.5, 7.0, 7.5] >>> l = list[np.arange[2,8,0.5]] >>> l [2.0, 2.5, 3.0, 3.5, 4.0, 4.5, 5.0, 5.5, 6.0, 6.5, 7.0, 7.5]

Create a list of floats using linspace

To create a list of floats between [N,M] with a given number of elementsa solution is to use the numpy function linspace:

>>> import numpy as np >>> l = [i for i in np.linspace[12,16,8]] >>> l [12.0, 12.571428571428571, 13.142857142857142, 13.714285714285714, 14.285714285714285, 14.857142857142858, 15.428571428571429, 16.0] >>> l = list[np.linspace[12,16,8]] >>> l [12.0, 12.571428571428571, 13.142857142857142, 13.714285714285714, 14.285714285714285, 14.857142857142858, 15.428571428571429, 16.0]

Create a list of random integers

The python function randint can be used to generate a random integer in a chosen interval [a,b]:

>>> import random >>> random.randint[0,10] 7 >>> random.randint[0,10] 0

A list of random numbers can be then created using python list comprehension approach:

>>> l = [random.randint[0,10] for i in range[5]] >>> l [4, 9, 8, 4, 5]

Another solution is to use randrange function [except that can specify a step if you need]:

>>> l = [random.randrange[0,10] for i in range[5]] >>> l [1, 7, 4, 3, 1] >>> l = [random.randrange[0,10,2] for i in range[5]] >>> l [2, 4, 4, 6, 0]

A third solution is to create a list of random numbers with no repetition, is to use random.sample function

>>> l = random.sample[range[1,100], 10] >>> l [89, 56, 87, 51, 46, 25, 52, 44, 10, 32]

References

Lists are the R objects which contain elements of different types like − numbers, strings, vectors and another list inside it. A list can also contain a matrix or a function as its elements. List is created using list[] function.

Creating a List

Following is an example to create a list containing strings, numbers, vectors and a logical values.

# Create a list containing strings, numbers, vectors and a logical # values. list_data