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How to empty a redis database?
...o empty the db (remove the sets, the existing key....) easily.
During my tests, I created several sets with a lot of members, even created sets that I do not remember the name (how can I list those guys though ?).
Any idea about how to get rid of all of them ?
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Force add despite the .gitignore file
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Well, I tested it to make sure it really works and it does. Can you describe your environemnt (OS, git version ...)? This is what I've basically done: echo "/foo" >> .gitignore; echo "bar" > foo; git add foo # should throw a...
Should I choose ActivePerl or Strawberry Perl for Windows? [duplicate]
...ess to almost all useful Perl modules available on CPAN - but prepared and tested for Windows. This was for me, in the long run, a much better (and more robust) choice. Even for the Windows version of the Apache HTTP server, there is a precompiled mod_perl (2.0.4) ppm available which will (did for m...
Python Git Module experiences? [closed]
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Latest python sh version does not work on Windows. Complete utter fail.
– void.pointer
Feb 28 '14 at 0:12
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Subset of rows containing NA (missing) values in a chosen column of a data frame
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Never use =='NA' to test for missing values. Use is.na() instead. This should do it:
new_DF <- DF[rowSums(is.na(DF)) > 0,]
or in case you want to check a particular column, you can also use
new_DF <- DF[is.na(DF$Var),]
In case you...
What happens if I define a 0-size array in C/C++?
... C++ Builder 2009 also correctly gives an error: [BCC32 Error] test.c(3): E2021 Array must have at least one element
– Lundin
Mar 15 '12 at 15:43
1
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Angular ng-repeat Error “Duplicates in a repeater are not allowed.”
...art. It would be very, very easy to miss this issue during development and testing because your array never contained duplicates, only to have your app explode in production when it gets exposed to dupes for the first time. I've built Angular apps before without knowing about the "no dupes" restrict...
Environment variables for java installation
...are done setting up your environment variables for your Java , In order to test it go to command prompt and type
java
who will get a list of help doc
In order make sure whether compiler is setup Type in cmd
javac
who will get a list related to javac
Hope this Helps !
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How to determine day of week by passing specific date?
...se SimpleDateFormat to parse it: new SimpleDateFormat("dd/M/yyyy").parse(dateString)
you can use joda-time's DateTime and call dateTime.dayOfWeek() and/or DateTimeFormat.
edit: since Java 8 you can now use java.time package instead of joda-time
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Java: What is the difference between and ?
...intln("In Static");
}
{
System.out.println("In Instance");
}
To test, use
Class<ByteCodeParent> bcp2 =(Class<ByteCodeParent>) Class.forName("ByteCodeParent");
ByteCodeParent bcp4= bcp2.newInstance();
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