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Omit rows containing specific column of NA
I want to know how to omit NA values in a data frame, but only in some columns I am interested in.
8 Answers
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jQuery map vs. each
In jQuery, the map and each functions seem to do the same thing. Are there any practical differences between the two? When would you choose to use one instead of the other?
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How to remove the first commit in git?
I am curious about how to remove the first commit in git.
9 Answers
9
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How to identify CAAnimation within the animationDidStop delegate?
I had a problem where I had a series of overlapping CATransition / CAAnimation sequences, all of which I needed to perform custom operations when the animations stopped, but I only wanted one delegate handler for animationDidStop.
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How to clear MemoryCache?
I have created a cache using the MemoryCache class. I add some items to it but when I need to reload the cache I want to clear it first. What is the quickest way to do this? Should I loop through all the items and remove them one at a time or is there a better way?
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How do I encode and decode a base64 string?
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Encode
public static string Base64Encode(string plainText) {
var plainTextBytes = System.Text.Encoding.UTF8.GetBytes(plainText);
return System.Convert.ToBase64String(plainTextBytes);
}
Decode
public static string Base64Decode(string base64Enc...
MongoDB - admin user not authorized
I am trying to add authorization to my MongoDB.
I am doing all this on Linux with MongoDB 2.6.1.
My mongod.conf file is in the old compatibility format
(this is how it came with the installation).
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Why do I need to do `--set-upstream` all the time?
I create a new branch in Git:
21 Answers
21
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Passing route control with optional parameter after root in express?
I'm working on a simple url-shortening app and have the following express routes:
2 Answers
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How to Resize a Bitmap in Android?
I have a bitmap taken of a Base64 String from my remote database, ( encodedImage is the string representing the image with Base64):
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