1. Overview QwtPlotMultiBarChart is a class in the Qwt drawing library used to draw multi-column bar charts. It can display multiple bars and group them into different categories. Bars under each category can have different colors and widths. The following is a class inheritance diagram: 2. Commonly used methods Setup data: void setSamples (const QVector< […]
Tag: aws
A new way to harvest AWS wool, taking ChatBot as an example
Most of the AWS tutorials on the Internet teach you how to apply for a free VPS for one year, which is too OUT! Just ask a question, what should I do when one year expires? In fact, in addition to one-year free VPS, AWS has more than 40 permanently free services, including AWS’s most […]
Solve abnormal situations such as ghosting or flickering caused by Z conflict when osg draws a scene
Table of Contents 1. Raising the question 2. Introduction to Z-fighting 2.1. Causes of Z-fighting 2.2. How to eliminate Z-conflict (z-fighting) 3. Code implementation 1. Question raising Today I drew a checkerboard. I clicked the mouse on the checkerboard and drew a red circle at the click point. However, the circle was always abnormal. The […]
The language model has major flaws, and knowledge deduction turns out to be a long-standing problem
Source: Heart of the Machine This article is about 2500 words, it is recommended to read for 5 minutes This article describes significant flaws in language models. Surprising discovery: Large models have serious flaws in knowledge deduction. Flexible application of knowledge is the key to wisdom. The human brain can process knowledge quickly, such as […]
AWS Lambda Operations RDS Example
Achieve goals Create a Lambda to receive the data passed in when calling, and write it into the RDS database Post table to store article information. The table structure is as follows: id title content create_date 1 I am the title I am the text content 2023-10-21 15:20:00 AWS resource preparation The RDS console creates […]
[uni-app] canvas draws circle progress bar
Article directory need Reference link Handling basic issues 1:Canvas rotation problem 2: Note that the starting position of arc() is the 3 o’clock direction 3: If you draw a circle of 1.9*Matn.PI, do you need to ensure that the actual position is in the 0-point direction? 4: How to draw small line segments and how […]
R language panel data regression: mixed model with time fixed effects to analyze traffic mortality, drunk driving laws and beer taxes…
Full text link: https://tecdat.cn/?p=33874 Panel data regression can alleviate the problem of omitted variable bias, especially when there is no information about variables related to both the regressor of interest and the dependent variables, and these variables are constant in the time or entity dimension( Click “Read the original text” at the end of the […]
Deploy java applications on centos or aws linux, and build a shell in the environment
Directory Set root password Enable password login Install docker Install nginx Set nginx to start automatically nginx configuration https configuration http cluster tcp port proxy and load balancing nginx prints post message body log Install docker Set docker to start automatically Modify docker basic configuration Create docker gateway docker install mysql Standalone version master-slave version […]
Python implements the immune algorithm and draws the training process
The immune algorithm is similar to the genetic algorithm, but the offspring are cloned instead of crossed, and the concept of affinity between antibodies is introduced. After calculating the antibody fitness, we also need to subtract the affinity between antibodies, so that the result It is not easy to fall into local optimality. Note that […]
Vue right mouse button draws rectangle and Ctrl key multi-select component
Renderings Description The component code and a Demo will be posted below. The above rendering is the effect of the Demo. It is recommended to copy the two codes directly to your own development environment to run and debug directly. Component code <template> <!– Use the mouse to draw a rectangle to select objects –> […]