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How to store a dataframe using Pandas
...ly).
Another popular choice is to use HDF5 (pytables) which offers very fast access times for large datasets:
store = HDFStore('store.h5')
store['df'] = df # save it
store['df'] # load it
More advanced strategies are discussed in the cookbook.
Since 0.13 there's also msgpack which may be...
Why and when to use Node.js? [duplicate]
...s the two sides.
Uses non-blocking I/O, and Chrome's V8 engine, to provide fast, highly scalable servers.
For me though, the most interesting part is the amount of activity happening in this area. There are a lot of very interesting ideas under development for node - be sure to check out the list...
What is the idiomatic Go equivalent of C's ternary operator?
...lue := min(a, b)
The compiler will inline such simple functions, so it's fast, more clear, and shorter.
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When do you use Git rebase instead of Git merge?
...
@spaaarky21 It looks like we're both half right. When a fast-forward merge is possible (as in your example), git will default to including all commits in the feature branch B (or as you suggest, you can use --squash to combine into a single commit). But in the case where there ar...
What is the fastest/most efficient way to find the highest set bit (msb) in an integer in C?
...ne assembler, Intel provides a BSR instruction ("bit scan reverse"). It's fast on some x86s (microcoded on others). From the manual:
Searches the source operand for the most significant set
bit (1 bit). If a most significant 1
bit is found, its bit index is stored
in the destination oper...
node.js database [closed]
...and npm that is really easy to work with. I haven't been able to test how fast it is, but it is really flexible (you can access your data in a browser too if you'd like).
The major issue here is which database design makes sense for your application. Do you have data that is largely key-value in ...
Image Processing: Algorithm Improvement for 'Coca-Cola Can' Recognition
...torial example
The processing takes a few hundred ms for SIFT, SURF is bit faster, but it not suitable for real-time applications. ORB uses FAST which is weaker regarding rotation invariance.
The original papers
SURF: Speeded Up Robust Features
Distinctive Image Features
from Scale-Invariant Keypoi...
Which Java Collection should I use?
...LinkedList is a double linked list, so access at start and at end are both fast. You will note that of the branches above all three questions have to answer yes before I'd recommend using the LinkedList - so in other words I agree with you that in most cases the answer is no. Things like queues and ...
What are the effects of exceptions on performance in Java?
... others recognized, that this is possibly suboptimal and of course VMs get faster and faster over the time. There is another way to implement exceptions, which makes try itself lightning fast (actually nothing happens for try at all in general - everything that needs to happen is already done when t...
Extract hostname name from string
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Don't use this if you need to do it fast. It's about 40-60 times slower than gilly3's method. Tested in jsperf: jsperf.com/hostname-from-url.
– cprcrack
Nov 5 '13 at 19:42
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