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How do you delete a column by name in data.table?
... copy of it), Methods 1, 2a, and 2b are really the best options.
# Method 4:
df3[, .SD, .SDcols = !patterns("^foo$")]
Lastly there are approaches using with=FALSE, though data.table is gradually moving away from using this argument so it's now discouraged where you can avoid it; showing here so...
How to remove unused C/C++ symbols with GCC and ld?
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maxschlepzig
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answered Jul 21 '11 at 1:11
J TJ T
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Use of #pragma in C
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answered Oct 24 '08 at 8:03
Steven A. LoweSteven A. Lowe
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Makefile经典教程（入门必备） - C/C++ - 清泛网移动版 - 专注C/C++及内核技术
...command.o和files.o都会被重编译，并且，edit会被重链接。
1.4 makefile中使用变量
在上面的例子中，先让我们看看edit的规则：
insert.osearch.o files.o utils.o
edit : $(objects)
main.o : main.c defs.h
kbd.o : kbd.c de...
Python: Tuples/dictionaries as keys, select, sort
Suppose I have quantities of fruits of different colors, e.g., 24 blue bananas, 12 green apples, 0 blue strawberries and so on.
I'd like to organize them in a data structure in Python that allows for easy selection and sorting. My idea was to put them into a dictionary with tuples as keys, e.g.,
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Numpy `logical_or` for more than two arguments
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answered Dec 11 '13 at 19:48
abarnertabarnert
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String literals: Where do they go?
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edited Apr 7 '10 at 4:34
answered Apr 7 '10 at 4:16
R...
How to add a “open git-bash here…” context menu to the windows explorer?
...ate to HKEY_CURRENT_USER\SOFTWARE\Classes\Directory\Background\shell
Step 4 : Right-click on "shell" and choose New > Key. name the Key "Bash"
Step 5 : Modify the value and set it to "open in Bash" This is the text that appears in the right click.
Step 6 : Create a new key under Bash and...