After the data source reads the data, we can use various conversion operators to convert one or more DataStreams into new DataStreams. After the data source enters, we can convert the data source into the data format we need according to a series of transformation operators, and then output it. Basic conversion operators (map/ filter/ […]
Tag: transformation
UI automation test framework design and PageObject transformation!
During the UI automation testing process, faced with complex business scenarios, we often encounter the following challenges: Simple recording/playback is fast, but cannot adapt to complex scenes; Writing automated test scripts is more flexible, but the workload is heavy and maintainability is poor; The previous encapsulation technology (PageObject) can adapt to various UI scenarios, but […]
Designing IIR digital filter using bilinear transformation method
1. Experimental purpose 1. Be familiar with the principles and methods of designing IIR digital filters using bilinear transformation method. 2. Master the computer simulation method of digital filters. 3. Obtain perceptual knowledge of digital filtering by observing the filtering effect on actual electrocardiogram signals. 2. Experimental content 1. Use bilinear transformation method to design […]
Inverse transformation of time series into images using Gram’s Angle Field (GAF)
In the process of studying “Imaging Time-Series to Improve Classification and Imputation”, I had a question, that is, how to reconstruct the original time series from the obtained Gram sum/difference field (GASF/GADF)? That is, the inverse transformation of time series to image transformation. For the process of converting time series to GASF/GADF, refer to this […]
OpenGL space coordinate transformation
First, you need to understand matrices. Matrices are often used for coordinate transformation in programs. Common matrices are: 1. Scaling matrix 2. Displacement matrix More one-dimensional coordinates: Homogeneous Coordinates use: 1. Allows us to displace on a 3D vector (we cannot displace the vector without the w component) 2. Divide the x, y and z […]
Three-dimensional transformation matrix practice – rotation, scaling, mirroring, cross-cutting, translation, and orthogonal projection of three-dimensional point clouds
1. Rotation matrix (right-handed coordinate system) Rotate around the x-axis Rotation matrix: The matrix on the right is the original coordinates of the point cloud, and the matrix on the left is the rotation matrix Visualization: Rotate 90 degrees around the x-axis Code: import vtk import numpy as np import math def pointPolydataCreate(pointCloud): points = […]
2.5 CSS element transformation
2D transformation: transform 1.1 displacement: translate translate: One value represents the horizontal direction, two values represent: horizontal and vertical directions. translateX: To set the horizontal displacement, you need to specify the length value; if you specify a percentage, it is the percentage of the reference to its own width. translateY: To set the vertical displacement, […]
Chapter 2, Dynamic Programming Algorithm (2.3.1-2.3.2.6)——Conversion (editing, transformation) issues
Table of Contents 2.3 Dynamic programming algorithm implementation——conversion (editing, transformation) problem 2.3.1 String conversion problem 2.3.1.1Problems 2.3.1.2 Determine dynamic rules (DP, state transition equation) and initial value (1) Insertion operation realizes state transfer (2) Delete operation to achieve state transfer (3) Replacement operation realizes state transfer (4)Initial value (5) Dynamic rules (DP, state transition equation) […]
Mysql row and column transformation “Everything you want is available”
Directory introduce 1. Prepare test data 2. Change one line to multiple lines according to the delimiter 3. Change one column to multiple columns and simply divide the columns into columns 4. One column becomes multiple columns, data pivot 5. Change multiple columns into one column Introduction In interviews and practical problems, we often encounter […]
[Basic operations] Bit operations: binary state compression, pairwise transformation, lowbit operation
1. Binary state compression Binary state compression refers to compressing a file with a length of m m The bool array of m uses a m m A method of representing and storing m-bit binary integers. The following bit operations can be used to access the corresponding subscript elements in the original bool array. Operation […]