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stringstream, string, and char* conversion confusion
...f course, the latter might not be easy and copying might be too expensive. What you can do instead is to bind the temporary to a const reference. This will extend its lifetime to the lifetime of the reference:
{
const std::string& tmp = stringstream.str();
const char* cstr = tmp.c_str();...
Pass a data.frame column name to a function
...columns. Only start delving into eval, substitute, etc. if you really know what you're doing.
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In which order should floats be added to get the most precise result?
...ght, sorting in ascending order (of magnitude) usually improves things somewhat. Consider the case where we're adding single-precision (32 bit) floats, and there are 1 billion values equal to 1 / (1 billion), and one value equal to 1. If the 1 comes first, then the sum will come to 1, since 1 + (1 /...
Generate all permutations of a list without adjacent equal elements
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From my understanding, this is what @jojo does - not always optimal.
– georg
Aug 13 '14 at 13:46
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Peak detection in a 2D array
...the results.
Choosing fingers (an idea)
Another problem is how to choose what is likely to be fingers out of all the peaks. I have an idea which may or may not work. I don't have time to implement it right now, so just pseudo-code.
I noticed that if the front fingers stay on almost a perfect circ...
How does lucene index documents?
...exing process is quite simple if you ignore low-level details. Lucene form what is called "inverted index" from documents. So if document with text "To be or not to be" and id=1 comes in, inverted index would look like:
[to] → 1
[be] → 1
[or] → 1
[not] → 1
This is basically it – the ind...
Graph Algorithm To Find All Connections Between Two Arbitrary Vertices
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What is the initial call to PathFind - do you pass in the source vertex [s]?
– bozo user
Feb 25 '13 at 1:39
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Explain how finding cycle start node in cycle linked list work?
...g.
Let's prove this hypothesis.
Let's first assume some oracle tells us what m is.
Then, if we let them move m + k steps, tortoise would have to arrive at the point they met originally (k steps away from the cycle beginning - see in the figure).
Previously we showed that m + k = (q - 2p) n.
S...
JAX-RS — How to return JSON and HTTP status code together?
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It works, but what I don't like about the Response return value is that in my opinion it pollutes your code, specially regarding to any client trying to use it. If you provide an interface returning a Response to a third party, he does not...
Named colors in matplotlib
What named colors are available in matplotlib for use in plots? I can find a list on the matplotlib documentation that claims that these are the only names:
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