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How to calculate the number of occurrence of a given character in each row of a column of strings?
I have a data.frame in which certain variables contain a text string. I wish to count the number of occurrences of a given character in each individual string.
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How to put a delay on AngularJS instant search?
...15 at 20:15
Michael Falck WedelgårdMichael Falck Wedelgård
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How to ignore the first line of data when processing CSV data?
I am asking Python to print the minimum number from a column of CSV data, but the top row is the column number, and I don't want Python to take the top row into account. How can I make sure Python ignores the first line?
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从一个开发的角度看负载均衡和LVS - 更多技术 - 清泛网 - 专注C/C++及内核技术
...工作，LVS无法完成。其次，某次用户访问是与服务端建立连接后交换数据包实现的，如果在第三层网络层做负载均衡，那么将失去「连接」的语义。软负载面向的对象应该是一个已经建立连接的用户，而不是一个孤零零的IP包。...
How to drop columns using Rails migration
...ot change, as explained in the answer by @Powers.
– XåpplI'-I0llwlg'I -
Aug 30 '13 at 5:32
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@X...
NUnit Unit tests not showing in Test Explorer with Test Adapter installed
...Jan 30 '16 at 21:41
Ricardo FrançaRicardo França
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How can I uninstall an application using PowerShell?
Is there a simple way to hook into the standard ' Add or Remove Programs ' functionality using PowerShell to uninstall an existing application ? Or to check if the application is installed?
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How to check whether a string is a valid HTTP URL?
... answered Nov 2 '14 at 14:12
Erçin DedeoğluErçin Dedeoğlu
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The input is not a valid Base-64 string as it contains a non-base 64 character
...ar 29 '16 at 9:40
Hasan Tuna OruçHasan Tuna Oruç
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手握利器，直面“蓝脸”! ——使用WinDbg抗击系统崩溃 - 操作系统(内核) - ...
...的USB键盘无效。(笔记本计算机键盘很多都是通过PS/2接口连接的，因此有效)
第二种情况是进不了系统就自动崩溃，无法提取出内存转储文件。这种情形以及当有特定的需要时，我们都可以采取双机调试的方法。我们将发生崩...