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Aggregate / summarize multiple variables per group (e.g. sum, mean)
...-date), sum)
# summarising a specific set of non-grouping variables using select_helpers
# see ?select_helpers for more options
df2 <- df1 %>% group_by(year, month) %>% summarise_at(vars(starts_with('x')), sum)
df2 <- df1 %>% group_by(year, month) %>% summarise_at(vars(matches('.*...
Can't start Eclipse - Java was started but returned exit code=13
...ava. Click on it and you will find all the different versions. Now you can select which one to uninstall.
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Google Maps API 3 - Custom marker color for default (dot) marker
...he Path menu.
To move the path to the (0,0), go to the Path Edit mode (F2) select all
the control nodes and drag them. Moving the object with F1, won't change the path node coords.
To ensure the reference point is at (0,0), you can select it alone and edit the coords by hand on the top toolbar.
Afte...
Add shadow to custom shape on Android
...;/shape>
</item>
</layer-list>
Then you should have a selector with diferent versions of the button, something like:
<?xml version="1.0" encoding="utf-8"?>
<selector xmlns:android="http://schemas.android.com/apk/res/android">
<item android:drawable="@drawabl...
Cutting the videos based on start and end time using ffmpeg
...this answer if you don't need to trim at an exact milisecond, thus it will select the closest keyframe available. That's why it's so fast, it selects the closest keyframes and takes the snippet out without the need of reencoding. However, if you do need a precise time, taking the nearest keyframe is...
how to POST/Submit an Input Checkbox that is disabled?
...
A bit old, but as sidenote: If you use <select> or <textfield> or other HTML elements that support the disabled attribute, you can select them and enable all with: $( "*:disabled" ).removeAttr("disabled");
– Gusstavv Gil
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How do I display the current value of an Android Preference in the Preference summary?
..., and ListPreference.getSummary() will format the summary with the current selected entry (or "" if none selected).
– SOFe
Aug 3 '16 at 7:19
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How do I configure PyCharm to run py.test tests?
...s the default, when I right-click on the project in the Projects panel and select New => Python File, the Kind: dropdown offers only: Python file, Unit test, Python stub, not Pytest. I have looked in all of the locations mentioned in the threads above. What am I missing?
–...
R: Comment out block of code [duplicate]
...tors use something like command or control and single quote to comment out selected lines of code. In RStudio it's Command or Control+/. Check in your editor.
It's still commenting line by line, but they also uncomment selected lines as well. For the Mac RGUI it's command-option ' (I'm imagining...
Is there any connection string parser in C#?
...here(kvp => kvp.Contains('='))
.Select(kvp => kvp.Split(new char[] { '=' }, 2))
.ToDictionary(kvp => kvp[0].Trim(),
kvp => kvp[1].Trim(),
...