Article Categories
- All Categories
-
Data Structure
-
Networking
-
RDBMS
-
Operating System
-
Java
-
MS Excel
-
iOS
-
HTML
-
CSS
-
Android
-
Python
-
C Programming
-
C++
-
C#
-
MongoDB
-
MySQL
-
Javascript
-
PHP
-
Economics & Finance
Articles by Nizamuddin Siddiqui
Page 23 of 196
How do you get the file size in C#?
Getting the file size in C# can be accomplished using several methods. The most common approach is using the FileInfo class, which provides the Length property to retrieve the size of a file in bytes. You can also use static methods from the File class for quick operations without creating instances. The FileInfo class is part of the System.IO namespace and provides comprehensive file manipulation capabilities including size retrieval, creation dates, and access permissions. Syntax Using FileInfo class to get file size − FileInfo fileInfo = new FileInfo(filePath); long fileSize = fileInfo.Length; Using ...
Read MoreHow to check whether the given matrix is a Toeplitz matrix using C#?
A Toeplitz matrix is a special matrix where every diagonal running from top-left to bottom-right contains identical elements. In other words, for any element at position matrix[i][j], it should be equal to matrix[i-1][j-1]. This property makes Toeplitz matrices useful in signal processing, time series analysis, and various mathematical applications. Toeplitz Matrix Diagonals 1 2 3 4 5 1 2 3 9 5 1 2 ...
Read MoreHow to search in a row wise and column wise increased matrix using C#?
A row-wise and column-wise sorted matrix has elements arranged in ascending order both horizontally (across rows) and vertically (down columns). This creates a special structure that allows for efficient searching algorithms beyond simple linear traversal. The most straightforward approach is to treat the sorted 2D matrix as a flattened 1D array and apply binary search. Since elements maintain sorted order when concatenated row by row, we can use index mapping to convert 1D positions back to 2D coordinates. Syntax Following is the syntax for converting between 1D and 2D indices in a matrix − // ...
Read MoreHow to create an image of matrix of pixels in R?
A matrix can be converted into a pixel's image representation in R. This visualization technique displays matrix values as colored pixels, where each matrix element corresponds to a pixel with intensity or color based on its value. We can create pixel matrix images using R's image() function with the useRaster argument for optimized rendering. Syntax image(x, y, z, zlim, xlim, ylim, col, add, xaxs, yaxs, xlab, ylab, breaks, oldstyle, useRaster, ...) Basic Matrix Image Creation Let's start with a simple 10x10 matrix of random values: M
Read MoreHow to check if a matrix is invertible or not in R?
If the matrix is singular then it is not invertible and if it is non−singular then it is invertible. Therefore, we can check if a matrix is singular or not. We can use is.singular.matrix function of matrixcalc for this purpose. For example, if we have a matrix called M then to check whether it is invertible or not, we can use is.singular.matrix(M).Example1Loading matrixcalc package and creating a matrix −library(matrixcalc) M1
Read MoreHow to create a vector with all dates in a particular year in R?
We know that some years are leap years and some are normal years. The leap years have 366 days and the normal years have 365 days. To create a vector with all dates in a particular year we can use first date and the last date of the year by reading them with as.Date and creating a sequence with seq function. Check out the below examples to understand how it is done.Example1Creating a vector with dates in year 2020 −seq(as.Date("2020-01-01"), as.Date("2020-12-31"), by="1 day")Output[1] "2020−01−01" "2020−01−02" "2020−01−03" "2020−01−04" "2020−01−05" [6] "2020−01−06" "2020−01−07" "2020−01−08" "2020−01−09" "2020−01−10" [11] "2020−01−11" "2020−01−12" "2020−01−13" "2020−01−14" "2020−01−15" ...
Read MoreHow to print a large number of values in R without index?
Whenever we print any vector then the left-hand side of the R window shows indexing, even if we have one value in the vector the index will be there. For example, if we print a vector that has value equal to 2 then the print output will be [1] 2, here [1] represents the index. If we want to print the vector without index then cat function can be used as shown in the below examples.Example1x1
Read MoreHow to change the repeated row names and column names to a sequence in a matrix in R?
To change the repeated row names and column names to a sequence, we first need to read those names in a vector then set them to row names and column names with make.unique function. For example, if a matrix has row names defined as A, B, A, B, A then it can be converted into A, B, A.1, B.1, A.2.Example1M1
Read MoreWhat is the difference between creating a matrix by using matrix function or as.matrix function in R?
The difference between as.matrix and matrix function is that nrow argument or ncol argument are not helpful with as.matrix function but with matrix function we can use them. Therefore, we can actual define a matrix with matrix function but if we have a data frame or data table then it can be converted to matrix by using as.matrix function.Examples of creating matrix with as.matrix and matrix functionExample1M
Read MoreHow to concatenate two or more vectors in R?
The concatenation of vectors can be done by using combination function c. For example, if we have three vectors x, y, z then the concatenation of these vectors can be done as c(x,y,z). Also, we can concatenate different types of vectors at the same time using the same same function.Example1set.seed(999) x1
Read More