大约有 43,100 项符合查询结果（耗时：0.0367秒） [XML]
How do I check if a string is a number (float)?
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How to combine multiple conditions to subset a data-frame using “OR”?
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my.data.frame <- subset(data , V1 > 2 | V2 < 4)
An alternative solution that mimics the behavior of this function and would be more appropriate for inclusion within a function body:
new.data <- data[ which( data$V1 > 2 | data$V2 < 4) , ]
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How can I get the last day of the month in C#? [duplicate]
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edited Apr 26 '15 at 22:44
ΩmegaMan
20.7k77 gold badges6969 silver badges8585 bronze badges
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numpy matrix vector multiplication [duplicate]
When I multiply two numpy arrays of sizes (n x n)*(n x 1), I get a matrix of size (n x n). Following normal matrix multiplication rules, a (n x 1) vector is expected, but I simply cannot find any information about how this is done in Python's Numpy module.
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在vc中使用xtremetoolkit界面库-----安装及环境配置 - C/C++ - 清泛网 - 专...
...先当然是配置发开环境了：
我使用的是vc6.0+xtremetoolkitPro15.3.1
以下链接是xtremetoolkitPro15.3.1免费下载地址：（其中还包含了注册机，解压Crack文件下的Keygen.zip就可以得到），
http://pan.baidu.com/s/1pJvfy0F
我因为之前安装的是一个绿...
Discuz菜单栏下面广告怎么弄？ - 更多技术 - 清泛网 - 专注C/C++及内核技术
...下:
<div id="dzf" class="cl">
<style type="text/css">
#dzf{padding:15px 0;line-height:160%;text-align:left;}
#dzf p{width:321px;text-indent:70px;background:url(http://www.discuz.net/data/attachment/album/201005/14/0953351hcnq10n6w4zqnwh.png) no-repeat 10px 2px}
.dzfbl{border-left:1px solid #...
Retina displays, high-res background images
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Do I need to double the size of the .box div to 400px by 400px to
match the new high res ...
“tag already exists in the remote" error after recreating the git tag
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Edit, 24 Nov 2016: this answer is apparently popular, so I am adding a note here. If you repl...
How to detect page zoom level in all modern browsers?
... this page to test all these methods of measuring the zoom level.
Edit (2011-12-12): I've added a project that can be cloned: https://github.com/tombigel/detect-zoom
IE8: screen.deviceXDPI / screen.logicalXDPI (or, for the zoom level relative to default zoom, screen.systemXDPI / screen.logicalXDP...
How to split a file into equal parts, without breaking individual lines? [duplicate]
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If you mean an equal number of lines, split has an option for this:
split --lines=75
If you...