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Opposite of %in%: exclude rows with values specified in a vector
A categorical variable V1 in a data frame D1 can have values represented by the letters from A to Z. I want to create a subset D2, which excludes some values, say, B, N and T. Basically, I want a command which is the opposite of %in%
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String concatenation: concat() vs “+” operator
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Find duplicate lines in a file and count how many time each line was duplicated?
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How can I replace every occurrence of a String in a file with PowerShell?
Using PowerShell, I want to replace all exact occurrences of [MYID] in a given file with MyValue . What is the easiest way to do so?
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Hidden features of C
I know there is a standard behind all C compiler implementations, so there should be no hidden features. Despite that, I am sure all C developers have hidden/secret tricks they use all the time.
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家政O2O百家争鸣后的卡位战：烧钱补贴并非良药 - 资讯 - 清泛网 - 专注C/C+...
...想存活，就需要不断抢占市场，战争在所难免。小马管家CEO马晨飞曾坦言“大家在抢占市场份额的时候，都难免去烧钱补贴做推广。但这绝对不是一个良性的生意。”如何在同质化和与巨头的竞争中突围，真正实现赢利，是所有...
家政O2O百家争鸣后的卡位战：烧钱补贴并非良药 - 资讯 - 清泛网 - 专注C/C+...
...想存活，就需要不断抢占市场，战争在所难免。小马管家CEO马晨飞曾坦言“大家在抢占市场份额的时候，都难免去烧钱补贴做推广。但这绝对不是一个良性的生意。”如何在同质化和与巨头的竞争中突围，真正实现赢利，是所有...
Installing R on Mac - Warning messages: Setting LC_CTYPE failed, using “C”
I would like install R on my laptop Mac OS X version 10.7.3
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Why doesn't C++ have a garbage collector?
I'm not asking this question because of the merits of garbage collection first of all. My main reason for asking this is that I do know that Bjarne Stroustrup has said that C++ will have a garbage collector at some point in time.
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How to convert char to int?
What is the proper way to convert a char to int ?
This gives 49 :
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