random

生成指定位数随机数的方法

由 落爺英雄遲暮 提交于 2020-02-22 08:56:47
这里说的指定位数一般是指位数较多，不是一般的成百上千那种。 如下面例子，为了使随机数能够尽可能的不重复，其实最好是一位数一位数的去随机，不过这样有点儿2。 我这里用的是byte[],然后把byte[]转化成long。 byte[] sbytes = new byte[8]; Random random = new Random();//其实random不止有random.next()这一个方法哦！ random.NextBytes(sbytes); long s = BitConverter.ToInt64(sbytes, 0); 这样就好了！ 来源： https://www.cnblogs.com/yuqf/archive/2012/07/31/Random.html

生成指定位数的随机字符串

由 耗尽温柔 提交于 2020-02-22 08:56:19
/// <summary> /// 该方法用于生成指定位数的随机字符串 /// </summary> /// <param name="VcodeNum">参数是随机数的位数</param> /// <returns>返回一个随机数字符串</returns> public static string RndNumStr(int VcodeNum) { string[] source = { "0", "1", "1", "3", "4", "5", "6", "7", "8", "9", "a", "b", "c", "d", "e", "f", "g", "h", "i", "j", "k", "l", "m", "n", "o", "p", "q", "r", "s", "t", "u", "v", "w", "x", "y", "z" }; string checkCode = String.Empty; Random random = new Random(); for (int i = 0; i < VcodeNum; i++) { checkCode += source[random.Next(0, source.Length)]; } return checkCode; } 来源： https://www.cnblogs.com/zhang9418hn/archive

Generate 100 normally distributed random numbers in Python

由 吃可爱长大的小学妹 提交于 2020-02-22 08:14:13
问题 I am an extreme beginner in Python and I am having a difficulty writing a very simple code. I am trying to write a simple code to generate 100 normally distributed number by using the function gauss with expectation 1.0 and standard deviation 0.005, and later store in an array that can be used to calculate the mean and standard deviation from those 100 sample. Here is my code: def uniformrandom(n): i=0 while i< n: gauss(1.0, 0.005) i = i + 1 return i Then I tried L = uniformrandom(100) The

Generate 100 normally distributed random numbers in Python

由 这一生的挚爱 提交于 2020-02-22 08:14:04
问题 I am an extreme beginner in Python and I am having a difficulty writing a very simple code. I am trying to write a simple code to generate 100 normally distributed number by using the function gauss with expectation 1.0 and standard deviation 0.005, and later store in an array that can be used to calculate the mean and standard deviation from those 100 sample. Here is my code: def uniformrandom(n): i=0 while i< n: gauss(1.0, 0.005) i = i + 1 return i Then I tried L = uniformrandom(100) The

Generate 100 normally distributed random numbers in Python

由 ぃ、小莉子 提交于 2020-02-22 08:09:13
问题 I am an extreme beginner in Python and I am having a difficulty writing a very simple code. I am trying to write a simple code to generate 100 normally distributed number by using the function gauss with expectation 1.0 and standard deviation 0.005, and later store in an array that can be used to calculate the mean and standard deviation from those 100 sample. Here is my code: def uniformrandom(n): i=0 while i< n: gauss(1.0, 0.005) i = i + 1 return i Then I tried L = uniformrandom(100) The

How do I create a random String by sampling from alphanumeric characters?

由 ☆樱花仙子☆ 提交于 2020-02-22 06:11:27
问题 I tried to compile the following code: extern crate rand; // 0.6 use rand::Rng; fn main() { rand::thread_rng() .gen_ascii_chars() .take(10) .collect::<String>(); } but cargo build says: warning: unused import: `rand::Rng` --> src/main.rs:2:5 | 2 | use rand::Rng; | ^^^^^^^^^ | = note: #[warn(unused_imports)] on by default error[E0599]: no method named `gen_ascii_chars` found for type `rand::prelude::ThreadRng` in the current scope --> src/main.rs:6:10 | 6 | .gen_ascii_chars() | ^^^^^^^^^^^^^^^

How do I create a random String by sampling from alphanumeric characters?

由 只谈情不闲聊 提交于 2020-02-22 06:11:00
问题 I tried to compile the following code: extern crate rand; // 0.6 use rand::Rng; fn main() { rand::thread_rng() .gen_ascii_chars() .take(10) .collect::<String>(); } but cargo build says: warning: unused import: `rand::Rng` --> src/main.rs:2:5 | 2 | use rand::Rng; | ^^^^^^^^^ | = note: #[warn(unused_imports)] on by default error[E0599]: no method named `gen_ascii_chars` found for type `rand::prelude::ThreadRng` in the current scope --> src/main.rs:6:10 | 6 | .gen_ascii_chars() | ^^^^^^^^^^^^^^^

How do I create a random String by sampling from alphanumeric characters?

由 风格不统一 提交于 2020-02-22 06:09:44
问题 I tried to compile the following code: extern crate rand; // 0.6 use rand::Rng; fn main() { rand::thread_rng() .gen_ascii_chars() .take(10) .collect::<String>(); } but cargo build says: warning: unused import: `rand::Rng` --> src/main.rs:2:5 | 2 | use rand::Rng; | ^^^^^^^^^ | = note: #[warn(unused_imports)] on by default error[E0599]: no method named `gen_ascii_chars` found for type `rand::prelude::ThreadRng` in the current scope --> src/main.rs:6:10 | 6 | .gen_ascii_chars() | ^^^^^^^^^^^^^^^

How do I create a random String by sampling from alphanumeric characters?

由 感情迁移 提交于 2020-02-22 06:09:05
问题 I tried to compile the following code: extern crate rand; // 0.6 use rand::Rng; fn main() { rand::thread_rng() .gen_ascii_chars() .take(10) .collect::<String>(); } but cargo build says: warning: unused import: `rand::Rng` --> src/main.rs:2:5 | 2 | use rand::Rng; | ^^^^^^^^^ | = note: #[warn(unused_imports)] on by default error[E0599]: no method named `gen_ascii_chars` found for type `rand::prelude::ThreadRng` in the current scope --> src/main.rs:6:10 | 6 | .gen_ascii_chars() | ^^^^^^^^^^^^^^^

目标检测——基本数据增广（旋转、裁剪、缩放、填充、亮暗、对比度等）

由 余生颓废 提交于 2020-02-22 05:38:06
图像处理的主要函数文件： image_utils.py # -*- coding: utf-8 -*- import numpy as np import cv2 from PIL import Image , ImageEnhance import random from box_utils import multi_box_iou_xywh , box_crop # 随机改变亮暗、对比度和颜色等 def random_distort ( img ) : # 随机改变亮度 def random_brightness ( img , lower = 0.5 , upper = 1.5 ) : e = np . random . uniform ( lower , upper ) return ImageEnhance . Brightness ( img ) . enhance ( e ) # 随机改变对比度 def random_contrast ( img , lower = 0.5 , upper = 1.5 ) : e = np . random . uniform ( lower , upper ) return ImageEnhance . Contrast ( img ) . enhance ( e ) # 随机改变颜色 def random_color ( img
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