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Display milliseconds in Excel
...t which keeps a running average and displays the time in a hh:mm:ss.000 format.
4 Answers
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Setting a system environment variable from a Windows batch file?
...vironment variable at the system level from a command prompt in Windows 7 (or even XP for that matter). I am running from an elevated command prompt.
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How do I get rid of this unwanted bar from Eclipse?
...t a combination of keys which made this bar appear when I was doing some shortcuts. This question has probably being answered before but since I don't know the exact name of the bar googling the problem has being fruitless. I've spent two hours trying to fix it. So anyone know how to get rid of this...
Twitter bootstrap 3 two columns full height
...with twitter bootstrap 3. It seems that twitter bootstrap 3 does not support full height layouts.
What I want to do:
19 A...
Can I use Class.newInstance() with constructor arguments?
...tance() but the class I am instantiating does not have a nullary constructor. Therefore I need to be able to pass in constructor arguments. Is there a way to do this?
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Why does the JVM still not support tail-call optimization?
...totype implementation and MLVM has listed the feature as "proto 80%" for some time now.
4 Answers
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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 -0.306639
You can also sub...
BigDecimal equals() versus compareTo()
... (thus 2.0 is not equal to 2.00 when compared by this method).
In other words: equals() checks if the BigDecimal objects are exactly the same in every aspect. compareTo() "only" compares their numeric value.
As to why equals() behaves this way, this has been answered in this SO question.
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How to tell if a tag failed to load
... able to tell whether the loading failed in some way -- a 404, a script error in the loaded script, whatever.
16 Answers
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JPA OneToMany not deleting child
...th a simple @OneToMany mapping between a parent and a child entity. All works well, only that child records are not deleted when I remove them from the collection.
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