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How to sum a variable by group

... 27 library(plyr) ddply(tbl, .(Category), summarise, sum = sum(Frequency)) ...
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What's the difference between a mock & stub?

... | edited May 27 '19 at 12:08 Daniel Holmes 1,55422 gold badges1111 silver badges2424 bronze badges ...
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Are static variables shared between threads?

... answered Feb 8 '11 at 15:27 Kirk WollKirk Woll 68.4k1818 gold badges169169 silver badges184184 bronze badges ...
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BaseException.message deprecated in Python 2.6

... client code. – Luciano Ramalho Jun 27 '12 at 20:24 add a comment  |  ...
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Changing Ctrl + Tab behavior for moving between documents in Visual Studio

... | edited Sep 27 '17 at 20:30 Mwiza 3,67822 gold badges2727 silver badges2626 bronze badges ...
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How do I include a pipe | in my linux find -exec command?

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JUnit vs TestNG [closed]

... | edited Apr 27 '12 at 12:07 Piotr Nowicki 15.8k88 gold badges5454 silver badges7979 bronze badges ...
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Difference between declaring variables before or in loop?

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How to prevent favicon.ico requests?

...irefox >= 25 doesn't like the above syntax anymore. I tested on Firefox 27 and it doesn't work while it still work on Webkit/Chrome. So here is the new one that should cover all recent browsers. I tested Safari, Chrome and Firefox: <link rel="icon" href="data:;base64,="> I left out the "sh...
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Streaming Audio from A URL in Android using MediaPlayer?

... answered Apr 3 '17 at 12:27 Shshank BhongShshank Bhong 22722 silver badges88 bronze badges ...