Tag：Difference
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2021 – as of September: Notes on new job hopping in IOS development
IOS basic questions What is the difference between classification and extension? What can they do separately? What are the limitations of classification? Which members are there in the classified structure?Talk about the implementation mechanism of atomic; Why can’t absolute thread safety be guaranteed (preferably in combination with scenarios)?What happens when an object modified by weak […]
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Prototype and prototype chain of JavaScript (4)
I really admire the push function of various platforms, and I don’t know how they know I’m interested in prototypes. I’ve been pushing all kinds of prototypes these days.After looking at it, I still feel dizzy. I found a problem. The more professional it is, the more dizzy it is. So it’s better to have […]
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What is the meaning of log2fc and FDR values when genes are differentially expressed on September 16, 2021?
Transcriptome analysisdifferential expressionGenes appear in the resultsLog2FCandFDRValue, what do these two mean? log2FCFC in is fold change, which represents the ratio of expression between two samples (groups). After taking the logarithm based on 2, it is log2fc. Generally, the absolute value of log2fc is greater than 1 by default as the screening standard of differential […]
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7. Position adjustments
[previous: 5. Statistical transformations] [next: 8. About coordinate system] Think about the grouping coloring of scatter graph. It’s still relatively simple. It’s just to use mapping = aes() to specify a variable for mapping.It’s not difficult to imagine the coloring of the histogram, but how do you realize the various forms of histogram you see? […]
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[issue 29] background development experience of Tencent Weibo
One side (part) Talk about internship: Chat items: Why go Do you know about memory leaks? What’s the harm? A very simple go topic, how to make a deep copy of go. Is map thread safe? How to solve the concurrency security problem? sync. How does map solve thread safety problems? Have you seen the […]
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Golang difference SQL tool for MySQL database table structure
mysqldiff Golang is a difference SQL tool for MySQL database table structure.go-mysqldiff use #View help ./mysqldiff –help #Examples ./mysqldiff –source user:[email protected]:port –db db1:db2 ./mysqldiff –source user:[email protected]:port –target user:[email protected]:port –db db1:db2 Automatic completion mysqldiff completion bash > /etc/bash_completion.d/mysqldiff && source /etc/bash_completion.d/mysqldiff pack Include command auto completion ./install.bash This work adoptsCC agreement, reprint must indicate the author […]
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Pinduoduo failed miserably in three aspects. Java middleware, database and spring framework can’t answer
recommend:Spring family bucket: Interview salary increase problem solution [45 lectures] + technical underlying principle source code [99 lectures], spring → boot → MVC → cloud → springsecurity! Pinduoduo failed miserably on three sides. Java middleware, database and spring framework can’t answer Interview open rocket, work screw At the beginning of this month, a friend had […]
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Hanging on the front side again? Learn from experience and don’t let the interview stop!
Hanging on the front side again? Why does it always fail to examine the side of basic knowledge? Let’s sum up! Front side (cool) Byte side ① CSS related Right fixed width 100px, left adaptive CSS box model Talk about absolute positioning Unit em, REM, REM applicable scenario Clear float Realize double wing layout and […]
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The difference between Z-index: 0 and Z-index: Auto in CSS
Recently, in the process of learning cascading context, I had a question about the difference between Z-index 0 and auto, so I went to Baidu to check the information. Found some problems, combined with their own practice (experiment?) Sorted out this note. Corrigendum When checking the data, we found a saying that if the Z-index […]
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Master the difference between BR and P tags through examples
Use of newline marker < br >Line feed tag < br > is a tag with no end. As long as the < br > tag is used anywhere in the HTML file, when the file is displayed in the browser, the text after the location will be displayed on the next line, and the […]
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Time series analysis model in tuoduan tecdat|r language: arima-arch / GARCH model to analyze stock price
Original link:Time series analysis model in R language: arima-arch / GARCH model to analyze stock price | tuoduan data technology / welcome to tecdat Original source:Tuoduan data tribe official account brief introduction Time series analysis is a main branch of statistics, which mainly focuses on analyzing data sets to study the characteristics of data and […]
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The biggest difference between C + + pointer array and two-dimensional array
The following essay is about the description of pointer array and the biggest difference between pointer array and two-dimensional array. Pointer array The elements of the array are pointer type Example: using pointer array to store matrix 1 #include 2 using namespace std; 3 int main() { 4 int line1[] = { 1, 0, 0 […]