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Remove an entire column from a data.frame in R
...can take an unusually long amount of time and/or fail due to out of memory errors. Package data.table helps address this problem with the := operator:
library(data.table)
> dt <- data.table(a = 1, b = 1, c = 1)
> dt[,a:=NULL]
b c
[1,] 1 1
I should put together a bigger example to sh...
How to install python modules without root access?
...tried a variant for my local python installation. curl --silent --show-error --retry 5 bootstrap.pypa.io/get-pip.py | ~/Python-2.7.8/python
– Neerav
Aug 11 '14 at 18:34
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Is there a real solution to debug cordova apps [closed]
...l open with developer tools. There you can click on "console" to check for errors
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How do I check in SQLite whether a table exists?
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If you are getting a "table already exists" error, make changes in the SQL string as below:
CREATE table IF NOT EXISTS table_name (para1,para2);
This way you can avoid the exceptions.
How to make a JTable non-editable
...leModel(tempTable, columnNames));, but that causes a "can not find symbol" error.
– user1164199
Aug 27 '15 at 13:17
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Have a reloadData for a UITableView animate when changing
...n calculations, but I had only one section and your code had an off-by-one error. I had to change the first line of your code to NSRange range = NSMakeRange(0, myTableView.numberOfSections);
– Danyal Aytekin
Jul 13 '12 at 12:41
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Sockets: Discover port availability using Java
...on e) {
throw new RuntimeException("You should handle this error." , e);
}
}
}
}
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Java: Get first item from a collection
...llection actually has contents. If it's empty the iterator might return an error, in which one has to check the collection size beforehand.
– spaceemotion
Nov 6 '15 at 17:05
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How to get name of calling function/method in PHP? [duplicate]
...g my memory limit, and I wanted to use this in production to log and email errors as they happen.
Instead I found this solution which works brilliantly!
// Make a new exception at the point you want to trace, and trace it!
$e = new Exception;
var_dump($e->getTraceAsString());
// Outputs the fo...
What's the difference between %s and %d in Python string formatting?
...he text string stored in the descrip variable. The round braces prevent an error message in Python 3.
– noobninja
Aug 27 '16 at 20:51
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