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Articles on Trending Technologies
Technical articles with clear explanations and examples
string.sub() function in Lua
Another important function of the Lua’s string library is the string.sub() function. The string.sub() function is used to extract a piece of the string.The string.sub() function takes three arguments in general, the first argument being the name of the string from which we want to extract a piece, the second argument is the i-th index or say, the starting index of the string piece that we want, and the third and the last argument is the j-th index of the last index of the string piece we want.It should be noted that both the starting index and the ending index, ...
Read MoreSmallest possible length constituting greatest frequency in JavaScript
ProblemWe are required to write a JavaScript function that takes in an array of numbers, arr, as the first and the only argument.Our function is supposed to find the smallest possible length of a (contiguous) subarray of the array arr, that has the same greatest frequency of any element as the whole array.For example, if the input to the function isInputconst arr = [55, 77, 77, 88, 55];Outputconst output = 2;Output ExplanationThe input array has the greatest frequency for any element of 2 because both elements 55 and 77 appear twice.Of the subarrays that have the greatest frequency as the ...
Read MoreHow to get a value from the cell of a Pandas DataFrame?
To get a value from the cell of a DataFrame, we can use the index and col variables.StepsCreate a two-dimensional, size-mutable, potentially heterogeneous tabular data, df.Print the input DataFrame, df.Initialize the index variable.Initialize the col variable.Get the cell value corresponding to index and col variable.Print the cell value.Exampleimport pandas as pd df = pd.DataFrame( { "x": [5, 2, 1, 9], "y": [4, 1, 5, 10], "z": [4, 1, 5, 0] } ) print("Input DataFrame is:", df) index = 2 col = "y" cell_val = df.iloc[index][col] print "Cell ...
Read MoreHow to select all columns except one in a Pandas DataFrame?
To select all columns except one column in Pandas DataFrame, we can use df.loc[:, df.columns != ].StepsCreate a two-dimensional, size-mutable, potentially heterogeneous tabular data, df.Print the input DataFrame, df.Initialize a variable col with column name that you want to exclude.Use df.loc[:, df.columns != col] to create another DataFrame excluding a particular column.Print the DataFrame without col column.Exampleimport pandas as pd df = pd.DataFrame( { "x": [5, 2, 1, 9], "y": [4, 1, 5, 10], "z": [4, 1, 5, 0] } ) print("Input DataFrame is:", df) col = ...
Read MoreHow to calculate transpose of a matrix using C program?
Transpose of a matrixThe transpose of a matrix is the one whose rows are columns of the original matrix, i.e. if A and B are two matrices such that the rows of the matrix B are the columns of the matrix A then Matrix B is said to be the transpose of Matrix A.The logic used to change m(i, j) matrix to m(j, i) is as follows −for (i = 0;i < m;i++) for (j = 0; j < n; j++) transpose[j][i] = matrix[i][j];Program 1In this example, we shall print the transpose of a matrix using for ...
Read MoreHow to remove a character in an R data frame column?
To remove a character in an R data frame column, we can use gsub() function which will replace the character with blank. For example, if we have a data frame called df that contains a character column say x which has a character ID in each value then it can be removed by using the command gsub("ID", "", as.character(df$x)).Example1Consider the below data frame −> x1 x2 df1 df1Output x1 x2 1 Male1 8 2 Female1 4 3 Male1 9 4 Male1 2 5 Male1 7 6 Female1 5 7 Male1 3 8 ...
Read MoreExplain the pointers for inter-function communication in C language.
We know that functions can be called by value and called by reference.If the actual parameter should not change in called function, pass the parameter-by value.If the value of actual parameter should get changed in called function, then use pass-by reference.If the function has to return more than one value, return these values indirectly by using call-by-reference. Read Also: Function Call by Value in C and Function Call by Reference in C ExampleFollowing is the C program for the demonstration of returning the multiple values −#include void main() { void areaperi(int, int*, int*); int r; float a, ...
Read MoreHow to compare two lists in Python?
The list in python is a collection of similar items. We may at times need to compare data items in the two lists to perform certain operations. We will discuss certain methods to compare two lists in python.Using list.sort() and == operatorThe list.sort() method sorts the two lists and the == operator compares the two lists item by item which means they have equal data items at equal positions. This checks if the list contains equal data item values but it does not take into account the order of elements in the list. This means that the list [1, 2, ...
Read MoreHow to declare a variable in Python?
In Python, we need not declare a variable with some specific data type.Python has no command for declaring a variable. A variable is created when some value is assigned to it. The value assigned to a variable determines the data type of that variable.Thus, declaring a variable in Python is very simple.Just name the variableAssign the required value to itThe data type of the variable will be automatically determined from the value assigned, we need not define it explicitly.Declare an integer variableTo declare an integer variable −Name the variableAssign an integer value to itExamplex=2 print(x) print(type(x))This is how you declare ...
Read MoreHow to print in same line in Python?
The print() method in Python automatically prints in the next line each time. The print() method by default takes the pointer to the next line.Examplefor i in range(5): print(i)Output0 1 2 3 4Modify print() method to print on the same lineThe print method takes an extra parameter end=" " to keep the pointer on the same line.The end parameter can take certain values such as a space or some sign in the double quotes to separate the elements printed in the same line.Syntaxprint("..." , end=" ")Print on same line with space between each elementThe end=” “ is used to ...
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