[R] count the number of numeric columns: sapply & lapply
The code for counting numerical variables is incorrect. You should use sapply and sum to count the number of numeric columns. num_vars <- sum(sapply(GE_survey, is.numeric)) sapply is a function in R that a...
java.lang.NumberFormatException: For input string: myabtis 报错解决方案
解决方法 第一种解决方法： <if test="isExpired=='Y'">and msg.expire_time < now()</if>会报NumberFormatException，这样就可以了。<if test="isExpired=='Y'.toString()">and msg.expire_time < now()</if> 第二种解决方法 <if test=" n...
TypeScript（八） number和string
1. TypeScript number 1.1. 描述 Number对象是原始数值的包装对象。 1.2.语法 var num = new Number(value);; 注意：如果一个参数值不能转换为一个数字，将返回NaN（非数字值）。 1.3. 对象属性 实例： console.log("TypeScript Number 属性: "); console.log("最大值为: " + Numbe...
LeetCode //C - 2336. Smallest Number in Infinite Set
2336. Smallest Number in Infinite Set You have a set which contains all positive integers [1, 2, 3, 4, 5, …]. Implement the SmallestInfiniteSet class: SmallestInfiniteSet() Initializes the SmallestInfinite...
LeetCode //C - 136. Single Number
136. Single Number Given a non-empty array of integers nums, every element appears twice except for one. Find that single one. You must implement a solution with a linear runtime complexity and use only co...
LeetCode //C - 201. Bitwise AND of Numbers Range
201. Bitwise AND of Numbers Range Given two integers left and right that represent the range [left, right], return the bitwise AND of all numbers in this range, inclusive. Example 1: Example 2: Example 3...
leetcode刷题日记:125. Valid Palindrome（验证回文串）和136. Single Number（只出现一次的数字）
'\0'; int l = 0; while(l<j){ if(x[j--]!=x[l++]){ return false; } } return true;} 运行结果： 136. Single Number（只出现一次的数字） 在此道题目种给了我们一个数组，其中有一个元素只出现一次，而其他元素都出现了两次，让我们去查找哪一个元素出现了一次，还必须设计并实现线性时间复杂度的算法来解决此问题，且该算法只使用...
“TypeError: must be a real number, not NoneType“
ndows下面使用moviepy==1.0.3保存视频的时候不会出现问题，但是在centos下面使用moviepy==1.0.3保存视频的时候出现"TypeError: must be a real number, not NoneType"，所以去晚上找答案，发现更新moviepy并不能解决我的问题，于是去google上继续搜索答案，直到找到这篇，按照里面的操作: pip uninstall moviepy...
1023 Have Fun with Numbers
Notice that the number 123456789 is a 9-digit number consisting exactly the numbers from 1 to 9, with no duplication. Double it we will obtain 246913578, which happens to be another 9-digit number consistin...
1100 Mars Numbers
People on Mars count their numbers with base 13: Zero on Earth is called "tret" on Mars.The numbers 1 to 12 on Earth is called "jan, feb, mar, apr, may, jun, jly, aug, sep, oct, nov, dec" on Mars, respectiv...