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Page 1970 of 2109
How to plot a histogram using Matplotlib in Python with a list of data?
To plot a histogram using Matplotlib, we can follow the steps given below −Make a list of numbers and assign it to a variable x.Use the plt.hist() method to plot a histogram.Compute and draw the histogram of *x*.We can pass n-Dimensional arrays in the hist argument also.To show the plotted figure, use the plt.show() method.Examplefrom matplotlib import pyplot as plt x = [300, 400, 500, 2000, 10] plt.hist(x, 10) plt.show()Output
Read MoreHow to display multiple images in one figure correctly in matplotlib?
To display multiple images in one figure, we can follow the steps given below −Initialize the number of rows and cols. nrows*ncols subplot will be created in the current figure. nrows = 2 and ncols = 2, i.e., 2*2 = 4 subplots can be created.Now add the figures at different indices from 1 to 4.Use plt.subplot(2, 2, 1) to add new images, i.e., pie at index 1.To plot a pie chart, pass a list of numbers. Pie charts will be split into the size of list and %age section will depend upon the values in the list.Set the title of ...
Read MoreHow to pick a new color for each plotted line within a figure in matplotlib?
To pick a new color for each plotted line within a figure, use the following steps −Setup X-axis and Y-axis labels for the diagram.Set the current .rc parameters. For axes facecolor, the group is axes.Use a cycler to set the color for the group of lines. The color list consists of ‘r’ for red, ‘g’ for green, ‘b’ for blue, and ‘y’ for yellow.Cycler class helps to create a new Cycler object from a single positional argument, a pair of positional arguments, or the combination of keyword arguments.Plot the number of lines with different colors.Use plt.show() to show the figure.Exampleimport ...
Read MoreHow to move the Y-axis ticks from the left side of the plot to the right side in matplotlib?
To shift the Y-axis ticks from left to right, we can perform the following steps −Create a figure using the figure() method.Using the above figure method, create the axis of the plot, using add_subplot(xyz), where x is row, y is column, and z is index.To shift the Y-axis ticks from left to right, use ax.yaxis.tick_right() where ax is axis created using add_subplot(xyz) method.Now plot the line using plot() method, with given x and y points, where x and y points can be created using np.array() method.Set up x and y labels, e.g., X-axis and Y-axis , using xlabel and ylabel ...
Read MoreFind next palindrome prime in C++
In this problem, we are given an element N. We need to find the next palindrome prime.Problem Description − We need to find the smallest prime number which is also a palindrome number, greater than N.Palindrome Number is a number in which the numbers are the same in both directions.Prime Number is a number if its only factors are 1 and itself.Let’s take an example to understand the problem, InputN = 12Output101ExplanationThe series of palindromes greater than 12 are 22, 33, 44, 55, 66, 77, 88, 99, 101… out of these the smallest palindrome is 101.Solution ApproachA simple solution to ...
Read MoreFind maximum sum array of length less than or equal to m in C++
In the problem, we are given n arrays of different length. Our task is to Find the maximum sum array of length less than or equal to m.We need to find sub-arrays from the arrays to maximise the sum and make the length of all subarrays combined equal to m.Let’s take an example to understand the problem, Inputn = 3, m = 4 arrOfArr[][] = { {5, 2, -1, 4, -3} {3, -2, 1, 6} {-2, 0, 5} }Output20ExplanationSubArrays are {5, 4}, {6}, {5}, length = 2 + 1 + 1 = 4 Sum = 5 + ...
Read MoreWrite a C program to work on statements using functions and loops
ProblemHow to print the long lines into two or more short lines based on specified length in the program using C Language?SolutionLet’s write a code to read a long line and print into two or more short lines according to the mentioned size in the program.The built in functions that we take in this program readline() function, is used to store text in array and returns the size of line.The logic we use to read a short sentence is explained below −while((charcter=readtext())>0){ if(charcter>length){ count=0; a=0; while(alength){ count=0; a=0; while(a
Read MoreHow to detect and track the motion of eyeball in OpenCV using C++?
Here, we will learn how to detect and track the motion of eyeball in OpenCV.The following program demonstrates to detect the eyeball and track the location.Example#include #include #include #include #include #include using namespace cv; using namespace std; Vec3f eyeBallDetection(Mat& eye, vector& circles) { vectorsums(circles.size(), 0); for (int y = 0; y < eye.rows; y++) { uchar* data = eye.ptr(y); for (int x = 0; x < eye.cols; x++) { int pixel_value = static_cast(*data); for (int i = 0; i < circles.size(); i++) { ...
Read MoreHow to track the face in real-time in OpenCV using C++?
We will learn how to track the face in real-time in OpenCV. This program is same to the previous program and difference is that we used ellipse instead of rectangle to identify the face and we also used additional 'cout' statement to show the co-ordinate of the face in the console window.The following program to detect human face in real-time −Example#include #include #include //This header includes definition of 'rectangle()' function// #include //This header includes the definition of Cascade Classifier// #include using namespace std; using namespace cv; int main(int argc, char** argv) { Mat video_stream;//Declaring a matrix hold frames from ...
Read MoreHow to detect the largest face in OpenCV using C++?
We will learn how to detect the largest face only. This topic is same as the previous topic. The only difference is we used an additional 'Rect' structure and a 'for loop' to detect the largest face.The actual format of this function −Mat faceROI = image_with_humanface(maxRect)The maxRect have the area and location information of the largest face located on the image. The line above is cropping the same area stored in maxRect on the same location where the largest face is located on the image and storing in 'faceROI' matrix.The following program detects the largest face from still pictures −Example#include ...
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