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Server Side Programming Articles
Page 1165 of 2109
Program to create largest lexicographic number from a list of numbers in C++
Suppose we have a list of numbers called nums, we have to rearrange its order to form the largest possible number and return that as a string.So, if the input is like nums = [20, 8, 85, 316], then the output will be "88531620".To solve this, we will follow these steps −Define an array tempfor each item i in nums:insert i into temp as stringsort the array temp based on lexicographic sequence (check for two strings a, b when a concatenate b is larger than b concatenate a or not)for each string s in temp:res := res concatenate sreturn resLet ...
Read MoreHow to set the Y-axis tick marks using ggplot2 in R?
The default value of Y-axis tick marks using ggplot2 are taken by R using the provided data but we can set it by using scale_y_continuous function of ggplot2 package. For example, if we want to have values starting from 1 to 10 with a gap of 1 then we can use scale_y_continuous(breaks=seq(1,10,by=1)).ExampleConsider the below data frame: x
Read MoreHow to add a rank column in base R of a data frame?
Ranking of a variable has many objectives such as defining order based on hierarchy but in data science, we use it mainly for analyzing non-parametric data. The ranking of a variable in an R data frame can be done by using rank function. For example, if we have a data frame df that contains column x then rank of values in x can be found as rank(df$x).ExampleConsider the below data frame: x1
Read MoreHow to create a rectangle inside boxplot in base R?
To create a rectangle inside boxplot in base R, we can use rect function after creating the boxplot. The rect function has many arguments but for the creation of a rectangle only first four are necessary and these are defined as xleft - a vector (or scalar) of left x positions, ybottom - a vector (or scalar) of bottom y positions, xright - a vector (or scalar) of right x positions and ytop - a vector (or scalar) of top y positions.Examplex
Read MoreHow to create a table of sums of a discrete variable for two categorical variables in an R data frame?
If we want to create a table of sums of a discrete variable for two categorical variables then xtabs function can be used. The output will be a contingency table or cross tabulation table which looks like a matrix. For example, if we have a data frame df with two categorical column x and y and a count column freq then the table of sums for freq can be created by using xtabs(freq~x+y,data=df1).ExampleConsider the below data frame −x1
Read MoreWhat is the use of pheatmap function in R?
The pheatmap function is used to create clustered heatmaps but we can change the aesthetics of the plot by using color argument which is one of the main functionalities of pheatmap function. There are many other arguments that differentiate pheatmap from heatmap function.Examplelibrary(pheatmap) M1
Read MoreHow to create a plot in base R without margins?
To create a plot without margins, we first need to define that margin in a way that the plot created after that will not have margins and this can be done by using par function. We would need to pass mar function within par function as par(mar=c(0,0,0,0)).Examplepar(mar=c(0,0,0,0)) plot(1:10)OutputExamplebarplot(1:10)Output
Read MoreHow to create a plot of Poisson distribution in R?
The Poisson distribution is a discrete distribution that has only one parameter named as lambda and it is the rate parameter. The rate parameter is defined as the number of events that occur in a fixed time interval. To create a plot of Poisson distribution in R, we can use the plot function with the density of the Poisson distribution using dpois function.Exampleplot(dpois(x=1:50,lambda=3))OutputExampleplot(dpois(x=1:50,lambda=3),type="l")OutputExampleplot(dpois(x=1:50,lambda=3),type="b")Output
Read MoreHow to remove duplicate rows and sort based on a numerical column an R data frame?
If we have duplicate rows in an R data frame then we can remove them by using unique function with data frame object name. And if we want to order the data frame with duplicate rows based on a numerical column then firstly unique rows should be found then order function can be used for sorting as shown in the below examples.ExampleConsider the below data frame −x1
Read MoreHow to divide row values of a numerical column based on categorical column values in an R data frame?
If we have a categorical column that has two or more categories and a numerical column then we might want to divide the one category numerical value from other category numerical value. This can be done by using divide sign / but we need to use the proper subset of the values.ExampleConsider the below data frame −x1
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