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Changing column names of a data frame
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Use the colnames() function:
R> X <- data.frame(bad=1:3, worse=rnorm(3))
R> X
bad worse
1 1 -2.440467
2 2 1.320113
3 3 -0.306639
R> colnames(X) <- c("good", "better")
R> X
good better
1 1 -2.440467
2 2 1.320113
3 3 -0...
Comment the interface, implementation or both?
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For C#, you can use <inheritdoc />, which is supported by SandCastle. (More info...)
– Daniel A.A. Pelsmaeker
Jul 8 '12 at 19:51
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Markdown and image alignment
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You can embed HTML in Markdown, so you can do something like this:
<img style="float: right;" src="whatever.jpg">
Continue markdown text...
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How is Generic Covariance & Contra-variance Implemented in C# 4.0?
...nnounced to support Generic covariance and contra-variance. That is, List<string> can be assigned to List<object> . How could that be?
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Sending email through Gmail SMTP server with C#
...I assume it's just as easy to make it work in a windows application):
<configuration>
<appSettings>
<add key="EnableSSLOnMail" value="True"/>
</appSettings>
<!-- other settings -->
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<!-- system.net settings -->
<sys...
How can I convert a Unix timestamp to DateTime and vice versa?
...meKind.Utc);
dtDateTime = dtDateTime.AddSeconds( unixTimeStamp ).ToLocalTime();
return dtDateTime;
}
Or, for Java (which is different because the timestamp is in milliseconds, not seconds):
public static DateTime JavaTimeStampToDateTime( double javaTimeStamp )
{
// Java timestamp is m...
Display back button on action bar
...t way to do so, check the below steps. Step 1 is necessary, step two have alternative.
Step 1 showing back button: Add this line in onCreate() method to show back button.
assert getSupportActionBar() != null; //null check
getSupportActionBar().setDisplayHomeAsUpEnabled(true); //show back button
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Difference between Visibility.Collapsed and Visibility.Hidden
...pies in the layout. So it renders whitespace instead of the control.
Visibilty.Collapsed does not render the control and does not reserve the whitespace. The space the control would take is 'collapsed', hence the name.
The exact text from the MSDN:
Collapsed: Do not display the element, and do ...
Default function arguments in Rust
Is it possible in Rust to create a function with a default argument?
6 Answers
6
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Multiline strings in VB.NET
Is there a way to have multiline strings in VB.NET like Python
21 Answers
21
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