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 on Trending Technologies
Technical articles with clear explanations and examples
How to create normal quantile-quantile plot for a logarithmic model in R?
How to create normal quantile-quantile plot for a logarithmic model in R?A logarithmic model is the type of model in which we take the log of the dependent variable and then create the linear model in R. If we want to create the normal quantile-quantile plot for a logarithmic model then plot function can be used with the model object name and which = 2 argument must be introduced to get the desired plot.Example1> x1 x1Output[1] 4.735737 3.631521 5.522580 5.538314 5.580952 4.341072 4.736899 2.455681 [9] 4.042295 5.534034 4.717607 6.146558 4.466849 5.444437 5.390151 4.491595 [17] 4.227620 4.223362 5.452378 5.690660 5.321716 5.269895 ...
Read MoreProgram to find angle between hour and minute hands of a clock in C++?
Suppose we have two values hours and minutes. We have to find a smaller angle formed between the hour and the minute hand.So, if the input is like hour = 12 minutes = 45, then the output will be 112.5To solve this, we will follow these steps:if h = 12, then set h := 0if m = 60, then set m := 0hAngle := 0.5 * (60h) + mmAngle := 6mret := |hAngle - mAngle|return minimum of ret and (360 – ret)Let us see the following implementation to get better understanding:Example#include using namespace std; class Solution { public: ...
Read MoreInorder Successor in BST II in C++
Suppose we have a node in a binary search tree, we have to find the in-order successor of that node in the BST. If there is no in-order successor, return null. As we know that the successor of a node is the node with the smallest key greater than value of node.We will have direct access to the node but not to the root of the tree. Here each node will have a reference to its parent node. Below is the definition for Node −class Node { public int val; public Node left; public Node right; ...
Read MoreLonely Pixel I in C++
Suppose we have a picture consisting of black and white pixels, we have to find the number of black lonely pixels. Here the picture is represented by a 2D char array consisting of 'B' and 'W', for the black and white pixels respectively.A black lonely pixel is actually 'B' that located at a specific position where the same row and same column don't have any other black pixels.If the input is like −WWBWBWBWWOutput will be 3. Because all the three 'B's are black lonely pixels.To solve this, we will follow these steps −n := size of picturem := (if n ...
Read MoreHow to set the diagonal elements of a matrix to 1 in R?
First thing we need to understand is diagonal elements are useful only if we have a square matrix, otherwise it would not make sense to set diagonal elements, this is known to almost all mathematicians but some freshman might get confused because we can create diagonal in a non-square matrix which should not be called a diagonal. In R, we can set the diagonal elements of a matrix to 1 by using diag function.Example1> M1 M1Output [, 1] [, 2] [, 3] [, 4] [, 5] [1, ] 1 6 11 16 21 [2, ...
Read MoreProgram to find minimum number of groups in communication towers in C++?
Suppose we have a 2D binary matrix where 1 represents a communication tower, and 0 represents an empty cell. The towers can communicate in the following ways: 1. If tower A, and tower B are either on the same row or column, they can communicate with each other. 2. If tower A can talk with tower B and B can talk with C, then A can talk to C (transitive property). We have to find the total number of tower groups there are (here a group is a list of towers that can talk with each other).So, if the input ...
Read MoreHow to create a barplot with gaps on Y-axis scale in R?
If we want to have gaps on Y-axis scale in a barplot then it cannot be done in base R. For this purpose, we can make use of gap.barplot function of plotrix package. The gap.barplot function is very handy, we just need to pass the vector for which we want to create the barplot and the gap values simply by using gap argument.Loading plotrix package:> library(plotrix)Example1> x xOutput[1] 2 6 5 4 7 2 5 2 5 2 8 6 8 13 3 5 7 7 5 6> gap.barplot(x, gap=c(2, 4)) ylim 0 11Warning message:In gap.barplot(x, gap = c(2, 4)) ...
Read MoreHow to fix the coefficient of an independent variable in R?
While doing the analysis we might know the variation in an independent variable or we might want to understand how other independent variables behave if we fix a certain variable. Therefore, we can fix the coefficient of an independent variable while creating the model and this can be done by using offset function with the coefficient of the variable for which we want to fix the value of the coefficient.ExampleConsider the below data frame:> set.seed(854) > x1 x2 y1 df1 df1Output x1 x2 y1 ...
Read MoreHow to create a point chart with point size increment based on the position of the point in R?
The cex argument is used to increase or decrease the point size in a point chart created in base R. If we want to create a point chart with points of size in increment manner then we can pass a vector of the same size as the vector for which we want to create the point chart. For example, if we have a vector x that contains 10 elements then cex will be set as cex=1:10.Example1> x plot(x, cex=1:10, xlim=c(1, 12), ylim=c(-2, 12))Output:ExampleLet’s have a look at another example:> y plot(y, cex=1:10, xlim=c(1, 12), ylim=c(-1, 12))Output:
Read MoreHow to change the resolution of a plot in base R?
In base R, we can save a plot as a png and pass the resolution in the same stage. The procedure to do this is creating the png image with resolution with res argument then creating the plot and using dev.off() to create the file. Check out the below examples to understand how it works.Example1> png(file="example1.png",res=100) > plot(1:10) > dev.off()Output:Example2> png(file="example2.png",res=200) > plot(1:10) > dev.off()Output
Read More