Numeric Column in data.frame returning "num" with str() but not is.numeric()

I have a data.frame, d1, that has 7 columns, the 5th through 7th column are supposed to be numeric: str(d1[5])

Replacing one colour with another in an NSImage

I have an NSImage and want to replace one color in it with another (e.g. replace all the blue with a green colour开发者_开发百科)Is there an easy way to do this and if not, how could I get this functi

吃红西柚的好处？

喜欢热天下大雨 2022-06-10 09:01 　　西柚营养丰富，开发者_StackOverflow社区尤其是维生素c非常高。很少有蔬菜和水果比西柚维生素c西柚更好。许多人喜欢吃，那么吃西柚有什么好处和坏处呢？

Python :: How to open a page in the Non Default browser

I was trying to create a simple script to open a locally hosted web site for testing the css in 2 or more browsers.The def开发者_JAVA百科ault browser is IE7 and it opens the page fine but when I try t

装修换窗户多少钱啊？装修换窗户大概多少钱？

_m13****5065 2022-06-11 17:00 开发者_StackOverflow中文版 装修换窗户大概多少钱关键看你是怎么装，有精装修、一般装修和简单的装修，此外还有半包和全包。不同的选择价格不一样，一般来说半包比较便宜一些。

where to find MyGeneration.dOOdads.dll

how to get MyGeneration.dOOdads.dll Actually I produced code from Mygen开发者_如何学Ceration utility and it requires this dll file. I find on many places but failed.

DependencyProperty with TwoWay Binding

I have a highly customized Edit control which inher开发者_开发知识库its RichTextBox. I needed a way to bind a Value to this control, so I registered a new DependencyProperty, but I have trouble to cod

去土耳其旅行有什么提醒和建议吗？

Microsoft Band 1元公测开始报名？

微软发布的首款可穿戴设备——微软Band微软手环可以跟踪运动轨迹、心率监测、计步、卡路里消耗、睡眠、自主学习、分析健康数据、辅助沟通、查看提醒、语音助手等功能。

AMD Q3季度GPU出货量持续缩水，Intel、NVIDIA涨幅超10%？

日前，市场调研机构JonPeddieResearch发布了2014年第三季度PC显卡市场报告，显示AMD出货量持续下滑，而英特尔和NVIDIA均增长超过10%，推动GPU整体出货量上升。