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How do I delete rows in a data frame?
... :
mydata[-seq(2, nrow(mydata), by = 2) , ]
Or if you want to subset by selecting odd numbers:
mydata[which(1:nrow(mydata) %% 2 == 1) , ]
Or if you want to subset by selecting odd numbers, version 2:
mydata[which(1:nrow(mydata) %% 2 != 0) , ]
Or if you want to subset by filtering even numbe...
Generate random number between two numbers in JavaScript
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a | 0 is also the fastest and most optimized way to convert a string to an integer. It only works with strings containing integers ("444" and "-444"), i.e. no floats/fractions. It yields a 0 for everything that fails. It is one of the main optimizations behind asm.js.
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Error message 'Unable to load one or more of the requested types. Retrieve the LoaderExceptions prop
...an also happen if your referenced DLL is "blocked". Right click on it, and select "unblock"
– Ben
Jun 10 '10 at 10:05
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IIS does not list a website that matches the launch url
..., but only when clicking on the icon directly. Right-clicking the icon and selecting a solution to open did not open visual studio in Administrator mode though sadly. I had to use QMaster's answer to get that to work.
– user1568891
Jul 27 '16 at 16:26
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Hidden features of Eclipse [closed]
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in the same vein select a word and hit ctrl-k or ctrl-shift-k and it will iterate through the selected string occurences
– Newtopian
Jun 8 '10 at 12:00
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mkdir -p functionality in Python [duplicate]
...swer, but I think there's value in the comment thread below. As such, I'm converting it to a wiki.
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How to make links in a TextView clickable?
...'t need the a href part. The OS will take the string parse it for urls and converts every url to a clickable link. But this won't result in the word google being linked to google.com. It would display www.google.com as link.
– Janusz
Apr 30 '10 at 6:37
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Dynamically generating a QR code with PHP [closed]
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but how to convert it into mvc standard any ideas !!!!
– saurabh kamble
Jun 19 '14 at 10:52
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Process.start: how to get the output?
...// do something with line
}
You can use int.Parse() or int.TryParse() to convert the strings to numeric values. You may have to do some string manipulation first if there are invalid numeric characters in the strings you read.
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Cloning a MySQL database on the same MySql instance
...IN db_a:
CREATE TABLE db_b.tbl LIKE db_a.tbl;
INSERT INTO db_b.tbl SELECT * FROM db_a.tbl;
The reason I'm not using the CREATE TABLE ... SELECT ... syntax is to preserve indices. Of course this only copies tables. Views and procedures are not copied, although it can be done in the same man...