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Does anyone know how to represent the do..while in Cython?
Ex:
http://www.tutorialspoint.com/cprogramming/c_do_while_loop.htm
Firstly, and most importantly, Cython supports for and while loops as found in Python without modification.
Secondly, Python does not have a do-while implementation. Hence, given the above, you can not do-while in Cython.
You can, however, achieve the same result, as expressed in this excellent answer.
Finally, remember that there is magic in getting the most out of Cython. For example, if you are looping over a range call, you will probably want to type the range argument as a C int. If you are looping over a Python container, statically typing the loop indexing variable may well introduce additional overhead. Kurt W Smith's excellent Cython is a worthwhile read if you are really going to get under the hood.
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I have a package written entirely in C, which creates a mySQL table and executes queries.
Given that R is written in C, are there alternatives to using Rcpp to write wrappers around this C code to construct an R package? Or is Rcpp the best method available (or only method available) to do this?
For backward compatibility to S lang, you may find "useful" learn something about:
.C()
.Call()
Rcpp is nowadays the most modern, performant and closest option to reuse your existing code.
There is no need for anything to call C code from R, and this is documented in Writing R Extensions. So if you want to avoid using Rcpp for some reason (and I can think of a few), you can just use the R C api. It typically requires more work and more care.
There are many packages on CRAN that use C or C++ without Rcpp, purrr comes to mind as an example.
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Play-json seems to be the only "well-known" to use macros for generating typeclasses, which suggests that other important ones ( Json4s, Spray-Json) have not been improved since a long time.
In particular for Spray-Json, an open ticket of more than 3 years ago propose this improvement (https://github.com/spray/spray-json/issues/59) and while the feature is available in some of the community contrib, it has never been merged in the library.
Compile-time safety seems an obvious feature that any mature library who is still developed should have. What is the current state of development of the Scala libraries for handling Json?
There is no need to use macros for this, shapeless offers everything you need, e.g. https://github.com/fommil/spray-json-shapeless
there isn't a language lib for dealing with json. Play-json is the library used in the Play framework, so it has some 'advantage' over the other.
Stil, Circe and argonaut are really nice as far as I've seen.
I remember to have seen another few, but without most of the features these 3 provide.
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I am trying to find if PHPExcel has any documentation for simple functions like "getActiveSheet" as I would prefer not to get my nose inside the library's code. I've search a whole day through the links related to "PHPExcel functions documentation" and apart from https://docs.typo3.org/typo3cms/extensions/phpexcel_library/1.7.4/manual.html and https://github.com/cystbear/PHPExcel/tree/master/Documentation.
There wasn't any documentation other than of simple functions as toArray() or "getActiveSheet()" .
My question is: does PHPExcel have any documentation for common functions related to manipulating the worksheet object like rangeToArray() or getHighestRow()? If it does, where can I find it?
Human-generated documentation for can always be found on the PHPExcel wiki, and there are also the API Docs
The former is included in the repository in the Documentation folder
The latter you can also generate yourself from the source using PHPDocumentor
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My software needs to read a fixed-length handwritten number.
While I could use a general-purpose library like Tesseract, I am sure there is something smarter. Tesseract will probably misinterpret some of the 1 or 7 as I or l, whereas a software that expects only numbers would not.
Knowing that there are only numbers (American-English way of writing them), the algorithm could focus on 10 potential matches instead of hundreds of symbols.
Any experience OCRing handwritten number-only fields?
What open source library/software did you get the best results with?
From the FAQ of Tesseract:
How do I recognize only digits?
In 2.03 and above:
Use
TessBaseAPI::SetVariable("tessedit_char_whitelist", "0123456789");
before calling an Init function or put this in a text file called tessdata/configs/digits:
tessedit_char_whitelist 0123456789
and then your command line becomes:
tesseract image.tif outputbase nobatch digits
Warning: Until the old and new config variables get merged, you must have the nobatch parameter too.
But I think since it was designed for printed—not handwritten—text, accuracy might suffer even for digits only.
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I'm looking for a Common Lisp implementation I ran across once, sometime in the past year or two. I only remember a few things, and I don't know how to search for it based on these facts, so maybe somebody here can help.
it was open-source, but wasn't one of the big ones (SBCL, CMUCL, MCL, etc.)
it was likely incomplete; it looked almost more like an exercise in writing the simplest possible self-hosted Common Lisp
the main webpage was plain black-on-white, and had 2 columns, where the left column was a link to the source file for a particular area of functionality (loop, format, clos, etc.), and the right column was a link to the tests for that functionality
the source files themselves were pretty-printed for the web, with syntax highlighting that looked kind of like an old Redhat Emacs default config: slate-gray background, etc.
Where can I find this Lisp implementation?
Thanks!
I don't know which one you are referring too, but you can find a list of Common Lisp Implementations here.
Is there any particular reason why this Lisp is grabbing your attention now?
Its hard to pin down, but open-source + minimalistic + incomplete sounds vaugely similar to Paul Graham's Arc programming language.