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parsec    音标拼音: [p'ɑrs,ɛk]
n. 表示天体间距离的单位

表示天体间距离的单位

parsec
n 1: a unit of astronomical length based on the distance from
Earth at which stellar parallax is 1 second of arc;
equivalent to 3.262 light years [synonym: {parsec}, {secpar}]

parsec \par"sec\ (p[aum]r"s[e^]k), n. [From parallax second. See
{parallax second} and {annual parallax}, under {parallax}.]
(Astron.)
A unit of length used in describing astronomical distances,
equal to 3.26 light years, or 3.086 x 1013 km. Abbreviated
pc. The derived units of kiloparsec (kpc, 1000 parsecs) and
megaparsec (mpc, one million parsecs) are often found in
discussion of astronomical distances.
[PJC]


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  • Using Parsec to parse regular expressions - Stack Overflow
    13 You should use Parsec Expr buildExprParser; it is ideal for this purpose You simply describe your operators, their precedence and associativity, and how to parse an atom, and the combinator builds the parser for you! You probably also want to add the ability to group terms with parens so that you can apply * to more than just a single literal
  • Right way to parse chain of various binary functions with `Parsec`?
    It is true that Parsec has chainl and chainr to parse chains of either left-associative or right-associative operations (i e a - gt; a - gt; a) So I could quite easily parse something like x + y
  • Simply using parsec in python - Stack Overflow
    The design of parsec requires a Parser to act independently on an input stream without knowledge of any other Parser To do this effectively a Parser must manage an index position of the input string
  • Parsec Connection Failure Error -10 and -11 - Stack Overflow
    Parsec Connection Failure Error -10 and -11 Asked 4 years ago Modified 4 years ago Viewed 3k times
  • ghc error: hidden package, but its actually exposed
    parsec-3 1 14 0 is not the same package as parsec-3 1 13 0 Something else is going on How did you install the package? What environment are you running ghc in? What's the full output of ghc-pkg list?
  • parsing - Parsec `try` should backtrack - Stack Overflow
    Isn't Parsec's try supposed to backtrack when it encounters failure? For instance, if I have the code import Control Applicative (( lt;| gt;)) import Debug Trace import Text Parsec (try) import Text
  • Parsec vs Yacc Bison Antlr: Why and when to use Parsec?
    My understanding is that Parsec creates a nice DSL of writing parsers and Haskell makes it very easy and expressive But parsing is such a standard popular technology that deserves its own language, which outputs to multiple target languages So when shall we use Parsec instead of, say, generating Haskell code from Bison Antlr?
  • Parsec: difference between try and lookAhead?
    The combinators try and lookAhead are similar in that they both let Parsec "rewind", but they apply in different circumstances In particular, try rewinds failure while lookAhead rewinds success
  • Writing a parser from scratch in Haskell - Stack Overflow
    It's actually surprisingly easy to build Parsec-from-scratch The actual library code itself is heavily generalized and optimized which contorts the core abstraction, but if you're just building things from scratch to understand more about what's going on you can write it in just a few lines of code I'll build a slightly weaker Applicative parser below Essentially, we want to produce a
  • parsing - Parsec debugging - Stack Overflow
    I've been working with parsec and I have trouble debugging my code For example, I can set a breakpoint in ghci, but I'm not sure how to see how much of the input has been consumed, or things like





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