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Amazon S3 boto - how to create a folder?
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There is no concept of folders or directories in S3. You can create file names like "abc/xys/uvw/123.jpg", which many S3 access tools like S3Fox show like a directory structure, but it's actually just a single file in a bucket.
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Apply a function to every row of a matrix or a data frame
Suppose I have a n by 2 matrix and a function that takes a 2-vector as one of its arguments. I would like to apply the function to each row of the matrix and get a n-vector. How to do this in R?
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JQuery Event for user pressing enter in a textbox?
...at's triggered only if the user hits the enter button in a textbox? Or any plugin that can be added to include this? If not, how would I write a quick plugin that would do this?
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Android get free size of internal/external memory
...t to get the size of free memory on internal/external storage of my device programmatically. I'm using this piece of code :
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Xcode debugging - displaying images
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Use Quick Look to inspect images in the Xcode debugger.
Select an NSImage or UIImage in the debugger, then click the Quick Look "eye" icon.
Like other areas of OS X, you can also use spacebar to Quick Look!
Quick Look in the debugger can also b...
HTTP could not register URL http://+:8000/HelloWCF/. Your process does not have access rights to thi
I'm a beginner in WCF, but trying to improve my experience. And on the first step I faced the problem. I created the simplest WCF service. The listing of code: (all the code in one file)
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How to configure logging to syslog in Python?
I can't get my head around Python's logging module. My needs are very simple: I just want to log everything to syslog. After reading documentation I came up with this simple test script:
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Why cast unused return values to void?
...asting an unused return value to void, or am I right in thinking it's a complete waste of time?
9 Answers
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Identify if a string is a number
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int n;
bool isNumeric = int.TryParse("123", out n);
Update As of C# 7:
var isNumeric = int.TryParse("123", out int n);
or if you don't need the number you can discard the out parameter
var isNumeric = int.TryParse("123", out _);
The var s can be re...
How to get current working directory in Java?
...ay I have my main class in C:\Users\Justian\Documents\ . How can I get my program to show that it's in C:\Users\Justian\Documents ?
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