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Trimming a huge (3.5 GB) csv file to read into R
...teLines(x, file_out) # copy headers
B <- 300000 # depends how large is one pack
while(length(x)) {
ind <- grep("^[^;]*;[^;]*; 20(09|10)", x)
if (length(ind)) writeLines(x[ind], file_out)
x <- readLines(file_in, n=B)
}
close(file_in)
close(file_out)
...
How to check if a String contains only ASCII?
... CharMatchers besides ASCII, and great factory methods for creating custom ones.
– ColinD
Aug 28 '10 at 2:49
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How do I create a Bash alias?
...es are hidden you will have to do an ls -a to list them. If you don't have one you can create one.
If I remember correctly, when I had bought my Mac, the .bash_login file wasn't there. I had to create it for myself so that I could put prompt info, alias, functions, etc. in it.
Here are the step...
Is there a version control system for database structure changes?
...n then apply the updates to the development database, test, iterate until done well.
Then, check in files, test again, and apply to production.
Also, I usually have a table in the db - Config - such as:
SQL
CREATE TABLE Config
(
cfg_tag VARCHAR(50),
cfg_value VARCHAR(100)
);
INSERT INTO ...
Finish all previous activities
... home is created and afterwards all the screens from 1 to 5 on top of that one. The code i posted will return you to home screen finishing all the other activites. You can add an extra in the intent and read that in the home screen activity and finish it also (maybe launch login screen again from th...
Can an interface extend multiple interfaces in Java?
...ording to JLS
An interface may be declared to be a direct extension of one or more
other interfaces, meaning that it implicitly specifies all the member
types, abstract methods, and constants of the interfaces it extends,
except for any member types and constants that it may hide.
...
Why is the String class declared final in Java?
... objects. You should read about immutability to understand more about it.
One advantage of immutable objects is that
You can share duplicates by pointing them to a single instance.
(from here).
If String were not final, you could create a subclass and have two strings that look alike when "s...
How to force NSLocalizedString to use a specific language
On iPhone NSLocalizedString returns the string in the language of the iPhone.
Is it possible to force NSLocalizedString to use a specific language to have the app
in a different language than the device ?
...
CGridCellNumeric - A numeric cell class for the MFC Grid - C/C++ - 清泛网 - 专注IT技能提升
... has the ability to edit and display numbers, among other things. The best one that I could come up with within my price range (free) was Chris Maunder's MFC Grid 2.25 [^]. But unfortunately, for me it needed some modifications to get it to work the way I wanted. The one modification I present here...
How do I get the path of the assembly the code is in?
...nt code resides? I do not want the path of the calling assembly, just the one containing the code.
30 Answers
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