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How to read and write excel file
I want to read and write an Excel file from Java with 3 columns and N rows, printing one string in each cell. Can anyone give me simple code snippet for this? Do I need to use any external lib or does Java have built-in support for it?
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Git commits are duplicated in the same branch after doing a rebase
...oing. In this simple case, the issue could be solved by doing a force push from dev to origin/dev after the rebase and notifying anyone else working off of origin/dev that they're probably about to have a bad day. The better answer, again, is "don't do that... use merge instead"
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efficient circular buffer?
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popping from the head of a list causes the whole list to be copied, so is inefficient
You should instead use a list/array of fixed size and an index which moves through the buffer as you add/remove items
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Why does C# have break if it's not optional? [duplicate]
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From the horse's mouth (MSDN) Why is the C# switch statement designed to not allow fall-through, but still require a break?.
Quoting the salient bits, this is why they don't allow fall-through:
This implicit fall-through beh...
Python and pip, list all versions of a package that's available?
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The answer below (using the script from pastebin) is more cumbersome, but at least works in my case (searching for versions of scipy). yolk only shows the last version being available, the other script shows all versions dating back to 0.8.0.
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Cluster analysis in R: determine the optimal number of clusters
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[10,] 3.445291 4.369232 0.9239414 0.05055486
Here's the output from Edwin Chen's implementation of the gap statistic:
Seven. You may also find it useful to explore your data with clustergrams to visualize cluster assignment, see http://www.r-statistics.com/2010/06/clustergram-visualiza...
Browse orphaned commits in Git
...--all is a good way to browse orphaned commits - and using the SHA1 hashes from that you can reconstruct history.
In my case though, the repository was corrupted so this didn't help; git fsck can help you find and sometimes fix errors in the repository itself.
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remove_if equivalent for std::map
I was trying to erase a range of elements from map based on particular condition. How do I do it using STL algorithms?
13 A...
Does Java casting introduce overhead? Why?
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There are 2 types of casting:
Implicit casting, when you cast from a type to a wider type, which is done automatically and there is no overhead:
String s = "Cast";
Object o = s; // implicit casting
Explicit casting, when you go from a wider type to a more narrow one. For this case, y...
Unix shell script find out which directory the script file resides?
...sing $BASH_SOURCE, and it returns what I needed. My script is being called from another script, and $0 returns . while $BASH_SOURCE returns the right subdirectory (in my case scripts).
– David Rissato Cruz
Dec 3 '15 at 16:28
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