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How to randomize (or permute) a dataframe rowwise and columnwise?
...t. This means that the default size is the size of the passed array. Passing parameter replace=FALSE (the default) to sample(...) ensures that sampling is done without replacement which accomplishes a row wise shuffle.
Shuffle column-wise:
> df3 <- df1[,sample(ncol(df1))]
> df3
c a b
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Remove non-utf8 characters from string
Im having a problem with removing non-utf8 characters from string, which are not displaying properly. Characters are like this 0x97 0x61 0x6C 0x6F (hex representation)
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how to use python to execute a curl command
I want to execute a curl command in python.
7 Answers
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Php multiple delimiters in explode
I have a problem, I have a string array, and I want to explode in different delimiter. For Example
12 Answers
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How to force LINQ Sum() to return 0 while source collection is empty
Basically when I do the following query, if no leads were matched the following query throws an exception. In that case I'd prefer to have the sum equalize 0 rather than an exception being thrown.
Would this be possible in the query itself - I mean rather than storing the query and checking query.A...
Downcasting shared_ptr to shared_ptr?
Update: the shared_ptr in this example is like the one in Boost, but it doesn't support shared_polymorphic_downcast (or dynamic_pointer_cast or static_pointer_cast for that matter)!
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git diff between two different files
In HEAD (the latest commit), I have a file named foo . In my current working tree, I renamed it to bar , and also edited it.
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No tests found with test runner 'JUnit 4'
... Eclipse. But now, when I relaunch test from the run menu, I get the following message:
41 Answers
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Declare variable in table valued function
How can I declare a variable in a table valued function? (like in my title)
1 Answer
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Argument list too long error for rm, cp, mv commands
I have several hundred PDFs under a directory in UNIX. The names of the PDFs are really long (approx. 60 chars).
27 Answers...