numbers | 易学教程

How to retrieve Python format code from number represented as string?

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问题 I have numeric data stored in ASCII txt files, i.e. values of different parameters with a column for each parameter. The format might be different between columns but does not change within a column. I load that data into Python, process it and write it back to ASCII files. The thing is: the format of the numbers should not change. Meaning that decimal places should still be the same, exp notation should still be exp notation and so on. So what I need is a function that returns format codes

Vim: Adding automatic alphabetic and/or numeric index to current file name?

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问题 I want to implement a loose version of Niklas Luhmann's Zettelkasten in Vim. At the core of his method are note snippets that Continue the current note or Brahch off from it, introducing a slightly different topic or concept. In the note name, letters indicate branches and numerals indicate continuations. Like so: note100 note101 note101a # branches off from note100 (related topic) note101b # also branches off from note100 (related topic) note101b01 # continues note101b (same topic)

Sticky posts, then normal posts, but limited amount (in wp query)

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问题 So on the first page of the project of which I'm working on I need to display a total of three posts from my custom post type 'project'. This post type also have some sticky posts which I wish to display first. And then the regular ones after. But it is important that the number of posts are three regardless of sticky amount. I've found a bunch of examples, but I can't get it right. Is there for example a way to query sticky posts first and limit those to three, and have a second query that

Images not appearing in Google Chrome

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问题 I have an image (with a number in the image name - it's called ad1.jpg). Anyhow, it loads fine on any major browser I tested, yet it never seems to load on Google Chrome for some reason. I saw it once today, but aside from that, it's the old image title that appears instead of the image. I am 150% sure that the problem is that Google Chrome is not properly reading the image name because of the number. Is there an actual problem with using number in image names using HTML5 standards? If not,

How to sort an NSMutableArray containing numbers as strings, in descending order

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问题 I was sorting an NSMutableArray containing numbers as strings, in descending order . My array is in the same form as below: {273,0,0,0,0,0,48,48,59,254} I was looking for sorting it in descending order. That is expected result is: {273,254,59,48,48,0,0,0,0,0} I tried: [[[myArray sortedArrayUsingSelector:@selector(compare:)] reverseObjectEnumerator] allObjects]; The result was weird. It was: {59,48,48,273,254,0,0,0,0,0} -- zeros are not getting sorted, and not proper sort Then I tried:

Converting number into words using if else

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问题 I am a beginner in c++. I have written a program to convert numbers into words. I am getting wrong output for numbers between 11-19 and numbers like this, 20,30,40,50,60,70,80,90. I also tried to add else statement between last two if statements so that It does not execute all the if statements even if the first if is true but it gives me an error that "else without a previous if". //This program converts number into words #include<iostream> using namespace std; main() { int number,unit,ten;

如何提高扩展运算符的性能

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博客地址： https://github.com/Wscats/articles/issues/88 在这篇文章中，我们会进行一个有趣的测试，看看我们如何提高扩展运算符的性能。让我们首先简要介绍一下扩展运算符在数组中的工作原理。扩展运算符，也就是我们常用的三个，让数组展开变成每个小块。然后使用中括号语法 [] ，重新组装这些小块构造一个新数组。扩展运算符可以被放置在中括号 [] 里面的任何位置。 const numbers = [1, 2, 3]; [0, ...numbers]; // => [0, 1, 2, 3] [0, ...numbers, 4]; // => [0, 1, 2, 3, 4] [...numbers, 4]; // => [1, 2, 3, 4] 回答我们一开始提出的问题，扩展运算符在数组文字中的位置是否可以提高性能？让我们往后继续探究。附加到头部和尾部功能在开始性能比较之前，让我们定义两个函数。第一个是 appendToTail() ： function appendToTail(item, array) { return [...array, item]; } const numbers = [1, 2, 3]; appendToTail(10, numbers); // => [1, 2, 3, 10] appendToTail()

Printing the Largest Prime Factor of a Composite Number in C

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问题 I was solving a puzzle, where im required to find the largest Prime Factor of a composite number entered by the user. I thought of something and have tried it out, but it doesn't manage to detect the largest prime factor amongst the factors of the composite number. I'm appending my code below, I'd be grateful if anyone could help me out here to get to detect the largest prime no. amongst the factors and print it. // Accept a composite number from user and print its largest prime factor.

Random number with probability

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问题 I am trying to generate a random number and have a probability of x% to get closer of the max value. Problem is that I have no idea how to do this, unless I make some steps? Let's say I'll generate a random number between 1 and 3000. $number = mt_rand(1, 3000) This will return 2700 for example. I would like it to be closer to 1 than 3000. How should I implement a function that will only have a 10% chance to get near 3000? 回答1: Based on the comments on the question you can use the mt_rand

Python any number to non-scientific string

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问题 I would like to have a function in python that can handle a diverse range of numbers from very large to very small and even large numbers with a small fraction right of the decimal (see code below). I need to convert the number to a string and remove any scientific notation it may have. I also need to remove trailing zeros right of the decimal point. This is the closest solution I have so far and it works for most numbers, but not all as you can see. Are there any improvements that can be