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Page 1974 of 2109
How to load and show image in OpenCV using C++?
In this topic, we will determine how to load and show images using OpenCV in C++. There are the following functions required for loading and showing an image in OpenCV. Mat: Mat is not a function. It is a data structure, a type of variable. Like int, char, string variable types in C++, Mat is a variable of OpenCV, which creates a matrix data structure to load images inside it. In this program, we wrote 'Mat myImage;'. That means we are declaring a matrix variable named 'myImage'. namedWindow(): It allocates some memory and creates a window to show the image. It works like a ...
Read MoreHow to install OpenCV for C++ in Windows?
There are three steps to install OpenCV, which are as follows −Downloading all required software and install them.Processing OpenCV for Visual Studio.Linking OpenCV with Visual Studio.Let us define these steps one by one.Step 1 - Downloading and Installing the required SoftwareWe will use OpenCV in Microsoft Visual Studio. So we must have to download Visual Studio and OpenCV.Visual StudioOpenCVCMakeLet us learn how to install this software first.Installing Visual StudioThe first step is to download the Visual Studio on your system from its official website or follow link https://visualstudio.microsoft.com/downloads/.Then click on the download button for downloading the Visual Studio. After installing ...
Read MoreHow to multiply large numbers with all digits in the output in R?
To multiply large numbers with all digits in the output, we can use mul.bigz function of gmp package. For example, if we have two vectors say x and y each containing numbers of large size then the multiplication of these numbers that will return all the digits of the multiplication can be done by using the command mul.bigz(x,y).Example1Loading gmp package and multiplying vectors containing large number values −library(gmp) x1
Read MoreHow to show values in boxplot in R?
The main values in a boxplot are minimum, first quartile, median, third quartile, and the maximum, and this group of values is also called five-number summary. Therefore, if we want to show values in boxplot then we can use text function and provide the five-number summary and labels with fivenum function as shown in the below examples.Example1x
Read MoreHow to create a horizontal boxplot in base R?
To create a horizontal boxplot in base R, we can set the horizontal argument inside boxplot function to TRUE. For example, if we have a vector called x then the horizontal histogram of that vector can be created by using the command boxplot(x,horizontal=TRUE).Example1x
Read MoreHow to create normal random variables with specific correlation between them in R?
To create normal random variables with specific correlation between them, we can use mvrnorm function of MASS package. For example, if we want to create two variables of size 10 with means equal to 2 and 4 and standard deviation of 0.5 then it can be done by using the command −mvrnorm(10,mu=c(2,4),Sigma=matrix(c(1,0.5,0.5,1),ncol=2),empirical=TRUE)Example1library(MASS) X
Read MoreHow to find prime factors of a number in R?
A prime number is the number that is only divisible by itself and one. These prime numbers can also divide other numbers hence they become a factor of those numbers. For example, 5 is a prime number and it also divides 20. To find the prime factors of a number, we can use primeFactors function of numbers package.Exampleslibrary(numbers)primeFactors(100)[1] 2 2 5 5primeFactors(1000)[1] 2 2 2 5 5 5 primeFactors(32547)[1] 3 19 571primeFactors(12354767)[1] 17 726751 primeFactors(21457)[1] 43 499primeFactors(99)[1] 3 3 11 primeFactors(365748)[1] 2 2 3 29 1051primeFactors(214687)[1] 11 29 673 primeFactors(3587497)[1] 3587497primeFactors(35874)[1] 2 3 3 1993 primeFactors(268713)[1] 3 3 73 409primeFactors(298473)[1] ...
Read MoreHow to subset a data.table object using a range of values in R?
To subset a data.table object using a range of values, we can use single square brackets and choose the range using %between%. For example, if we have a data.table object DT that contains a column x and the values in x ranges from 1 to 10 then we can subset DT for values between 3 to 8 by using the command DT[DT$x %between% c(3,8)].Example1Loading data.table package and creating a data.table object −library(data.table) x1
Read MoreHow to create empty bar plot in base R?
To create a bar plot in base R, we can use the function barplot and pass the vector or column of the data frame for which we want to create the bar plot but the bars created by using barplot by default has grey color. Therefore, if we want to create an empty bar plot then setting the color of bars to NA will make the plot an empty bar plot.Example1x
Read MoreHow to create a histogram without bins in base R?
We can set type argument to s in plot function to create a histogram without bins but first we need to create the histogram and store it in an object. For example, if we have a vector say x then the histogram of x can be stored in an object called p then we can use the command plot(c(p$counts,0),type="s") to create the histogram without bins as shown in the below example.Example> x p plot(c(p$counts,0),type="s")Output
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