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Installing older version of R package
...all yesterday's version of checkpoint, by date
install.dates('checkpoint', Sys.Date() - 1)
# install earlier versions of checkpoint and devtools
install.versions(c('checkpoint', 'devtools'), c('0.3.3', '1.6.1'))
That has the advantage of not requiring Rtools to install binary packages on Windows,...
How would I run an async Task method synchronously?
...or simple stuff. Also, if the method returns an IAsyncOperation, I had to convert it to a Task first: BlahAsync().AsTask().GetAwaiter().GetResult();
– Lee McPherson
Apr 7 '16 at 5:22
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How to convert String to long in Java?
I got a simple question in Java: How can I convert a String that was obtained by Long.toString() to long ?
9 Answers
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How to convert an xml string to a dictionary?
...a socket. I have the xml document stored in a string which I would like to convert directly to a Python dictionary, the same way it is done in Django's simplejson library.
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How do I use installed packages in PyCharm?
... need to modify the path directly, either through environment variables or sys.path. Whether you use the os (ex. apt-get), or pip in a virtualenv, packages will be installed to a location already on the path.
In your example, GNU Radio is installed to the system Python 2's standard site-packages l...
convert UIImage to NSData
...mage inside a UIImageView , e.g. "myImageView", you can do the following:
Convert your image using UIImageJPEGRepresentation() or UIImagePNGRepresentation() like this:
NSData *data = UIImagePNGRepresentation(myImageView.image);
//or
NSData *data = UIImageJPEGRepresentation(myImageView.image, 0.8);...
How to convert a factor to integer\numeric without loss of information?
When I convert a factor to a numeric or integer, I get the underlying level codes, not the values as numbers.
10 Answers
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MySQL and GROUP_CONCAT() maximum length
I'm using GROUP_CONCAT() in a MySQL query to convert multiple rows into a single string.
However, the maximum length of the result of this function is 1024 characters.
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How do I convert NSMutableArray to NSArray?
How do I convert NSMutableArray to NSArray in objective-c ?
9 Answers
9
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Convert RGB to RGBA over white
I have a hex color, e.g. #F4F8FB (or rgb(244, 248, 251) ) that I want converted into an as-transparent-as-possible rgba color (when displayed over white). Make sense? I'm looking for an algorithm, or at least idea of an algorithm for how to do so.
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