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How to use a variable to specify column name in ggplot
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From the release notes of ggplot2 V3.0.0 :
aes() now supports quasiquotation so that you can use !!, !!!, and
:=. This replaces aes_() and aes_string() which are now
soft-deprecated (but will remain around for a long time).
The idiomatic way now would be to convert ...
On logout, clear Activity history stack, preventing “back” button from opening logged-in-only Activi
...esearching this issue and reading all of these StackOverflow threads. I am now newly initiated and I leave here trace of my humble experience to help a future pilgrim.
First, there is no obvious or immediate way to do this per my research (as of September 2012). You'd think you could simple startAc...
How to update Python?
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UPDATE: 2018-07-06
This post is now nearly 5 years old! Python-2.7 will stop receiving official updates from python.org in 2020. Also, Python-3.7 has been released. Check out Python-Future on how to make your Python-2 code compatible with Python-3. For upda...
Use IntelliJ to generate class diagram
...re's no plugins available for community version to generate class diagram, now and in the future?
– Bruce Sun
Sep 20 '16 at 3:50
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What does “dereferencing” a pointer mean?
...ate, see "More about memory addresses, and why you probably don't need to know" at the end of this answer.
When you want to access the data/value in the memory that the pointer points to - the contents of the address with that numerical index - then you dereference the pointer.
Different computer...
Using SASS with ASP.NET [closed]
...started with a tutorial like this.
Prefer Bundling? Bundle Transformer now finally uses libsass, enabling high-speed compilation.
Here's why I think you should use Node and Gulp.
Node is popular now for Frontend Tooling Many web developers are now using Node a platform for frontend web deve...
How to change ViewPager's page?
...with only 5, then call notifyDataSetChanged(), what you'll find is you are now viewing page 3 of the new set. If you were previously viewing page 8 of the old set, after putting in the new set and calling notifyDataSetChanged() you will find you are now viewing the last page of the new set without ...
How to convert View Model into JSON object in ASP.NET MVC?
...ing the widget with some widget framework anyway). It may not be a problem now, but it would be good practice to add the brackets now to save yourself muchos effort in the future when it becomes a requirement, it's also good OO practice to encapsulate the functionality.
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Subtract 7 days from current date
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use dateByAddingTimeInterval method:
NSDate *now = [NSDate date];
NSDate *sevenDaysAgo = [now dateByAddingTimeInterval:-7*24*60*60];
NSLog(@"7 days ago: %@", sevenDaysAgo);
output:
7 days ago: 2012-04-11 11:35:38 +0000
Hope it helps
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How do I inspect the view hierarchy in iOS?
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Xcode 6 now has 3D view hierarchy inspection built in like Reveal App and Spark Inspector.
Click on the "Debug View Hierarchy" button while your app is running to pause execution and inspect the views at the current moment.
Mor...