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chyanog

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zdzqy: »ØÌûÖö¥ 2013-08-07 10:44:14
CompileÒ»µãÒ²²»¼¦Àߣ¬²¢²»ÊÇÖ»ÄܱàÒëһЩ¼òµ¥º¯Êý£¬Ò»Ð©ÊýÖµ¼ÆËã³ÌÐò¿ÉÒÔÌáËÙ30~100±¶ÒÔÉÏ£¬µ«Ê¹ÓÃһЩ¸ß¼¶µÄº¯Êýʱ£¨NSolve£¬NIntegrateµÈ£©¾Íû±ØÒªCompileÁË£¬²»»áÓмÓËÙЧ¹û£¬
ʹÓÃCompilationTarget -> "C"£¬ÐèÒª±¾»ú°²×°ÓÐC±àÒëÆ÷£¬ÈçVisualStudio,GCC¶¼¿ÉÒÔ£¬Ã»Óеϰ¼´Ê¹¼ÓÁËÕâ¸öÑ¡ÏÈÔÈ»ÊÇÏ൱ÓÚCompilationTarget -> "WVM"£¬Í¬Ê±»áÓÐÒ»¸ö¾¯¸æ
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ggs[m_Integer] := Block[{t},
   Do[t = Sqrt@N[i*i + j*j];
    If[FractionalPart[t] == 0, Sow@{i, j, Round@t}], {i, m}, {j,   i + 1, m}]];

cggs = Compile[{{m, _Integer}}, Block[{t},
    Do[t = Sqrt@N[i*i + j*j];
     If[FractionalPart[t] == 0, Sow@{i, j, Round@t}], {i, m}, {j,  i + 1, m}]]];

Reap[ggs@1000][[2, 1]] // Length // AbsoluteTiming
Reap[cggs@1000][[2, 1]] // Length // AbsoluteTiming
7Â¥2013-08-03 20:11:32
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mshwangg

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zdzqy: ½ð±Ò+1, ¡ï¡ï¡ïºÜÓаïÖú 2013-08-07 10:40:49
Mathematica°ïÖúÎļþÀï¹ØÓÚCompileÓÐÕâÑùÁ½¶Î»°£º
If you make a definition like f[x_]:=x Sin[x], Mathematica will store the expression x Sin[x] in a form that can be evaluated for any x. Then when you give a particular value for x, Mathematica substitutes this value into x Sin[x], and evaluates the result. The internal code that Mathematica uses to perform this evaluation is set up to work equally well whether the value you give for x is a number, a list, an algebraic object, or any other kind of expression.
Having to take account of all these possibilities inevitably makes the evaluation process slower. However, if Mathematica could assume that x will be a machine number, then it could avoid many steps, and potentially evaluate an expression like x Sin[x] much more quickly.

¿´Ã÷°×Á˰ɣ¿Mathematica´¦ÀíÒ»¸ö±äÁ¿µÄʱºòÒª¿¼ÂǺܶàÖÖ¿ÉÄܵÄÇé¿ö£¬±ÈÈç˵Õâ¸ö±äÁ¿ÊÇʵÊý¡¢¸´Êý¡¢Êý×黹ÊÇ´úÊý·ûºÅµÈµÈ£¬ËùÒÔ´¦ÀíÆðÀ´±È½ÏÂý¡£¶øÓÃCompile²»¹ýÊÇÉ趨ʹÓõıäÁ¿ÊǾßÌåµÄÄÇÖÖÊý¾ÝÀàÐÍ£¬¼ÆËãÆðÀ´µ±È»Òª¿ìһЩ¡£

ʵ¼ÊÉÏ£¬¸öÈËÈÏΪCompileµÄ¹¦ÄÜÓе㼦Àߣ¬Ëü²»Éú³É¿ÉÖ´ÐÐÎļþ£¬Ò²²»¿ÉÒÔÍÑÀëMathematica»·¾³ÔËÐгÌÐò¡£Èç¹ûÔÚ³ÌÐòÖÐÿ¸ö±äÁ¿ÔÚʹÓÃ֮ǰ¸³Öµ²¢ÇÒËùÓпÉÄܵĺ¯Êý¶¼×öÊýÖµÔËË㣬±ÈÈçNSolve£¬NIntegrate£¬ÄÇôCompileÓë·ñÆäʵ²î±ð²»´ó£¬²»»áΪÄã½ÚÊ¡¶àÉÙʱ¼ä¡£

ComplieµÄʹÓ÷½·¨²Î¿¼£ºÔÚMathematicaÀï¼üÈë¡°Compile¡±£¬È«Ñ¡£¬°´¼üÅÌÉϵġ°F1¡±£¡
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2Â¥2013-06-04 09:39:06
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walk1997

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1. °²×°ºÃC
2. Ö±½Óµ÷ÓÃcomplile¡£
¶ÔÓÚ¸´ÔÓº¯ÊýµÄ¼ÆËãµÄ »¹ÊÇÓбȽÏÃ÷ÏÔËٶȵÄÌá¸ßµÄ
²»¹ý±àÒë³ÉCºÍVMµÄ ¿´ÆðÀ´²î±ð²»ÊǺܴó Ò²Ðí·Ç³£¸´Ôӵıí´ïʽ»áÓвî±ð
ÁíÍâ Èç¹ûÊDZí´ïʽ·Ç³£¸´Ôӵϰ ×îºÃÏàÓÅ»¯Ï±í´ïʽ
an example to show the difference
Clear["Globale`*"];
f[x_Real] := x^2 + 1;
c1 = Compile[ {{x, _Real}}, x^2 + 1, CompilationTarget -> "C"];
c2 = Compile[ {{x, _Real}}, x^2 + 1];
Do[c1, {i, 1.0, 10.0^6, 1.0}] // Timing
Do[c2, {i, 1.0, 10.0^6, 1.0}] // Timing
Do[f, {i, 1.0, 10.0^6, 1.0}] // Timing
Do[c1, {i, 1, 10^6, 1}] // Timing
Do[c2, {i, 1, 10^6, 1}] // Timing
Do[f, {i, 1, 10^6, 1}] // Timing
3Â¥2013-06-06 08:23:10
ÒÑÔÄ   »Ø¸´´ËÂ¥   ¹Ø×¢TA ¸øTA·¢ÏûÏ¢ ËÍTAºì»¨ TAµÄ»ØÌû

walk1997

½ð³æ (ÖøÃûдÊÖ)

×îÏÂÃæ¼¸ÐÐ Åöµ½ ʱºò ×ÜÊdzö´í ¿´À´ÒÔºó¸Ä³É [j]
4Â¥2013-06-06 08:24:22
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zdzqy

гæ (СÓÐÃûÆø)

ÒýÓûØÌû:
2Â¥: Originally posted by mshwangg at 2013-06-04 09:39:06
Mathematica°ïÖúÎļþÀï¹ØÓÚCompileÓÐÕâÑùÁ½¶Î»°£º
If you make a definition like f:=x Sin, Mathematica will store the expression x Sin in a form that can be evaluated for any x. Then when you give a par ...

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5Â¥2013-06-07 19:47:38
ÒÑÔÄ   »Ø¸´´ËÂ¥   ¹Ø×¢TA ¸øTA·¢ÏûÏ¢ ËÍTAºì»¨ TAµÄ»ØÌû

zdzqy

гæ (СÓÐÃûÆø)

ÒýÓûØÌû:
4Â¥: Originally posted by walk1997 at 2013-06-06 08:24:22
×îÏÂÃæ¼¸ÐÐ Åöµ½ ʱºò ×ÜÊdzö´í ¿´À´ÒÔºó¸Ä³É

àÅ£¬ÎÒ¿´Â¥ÉϵĽ¨ÒéȷʵÓеÀÀí£¬ÒòΪÎҵĺ¯Êý²¢²»¸´ÔÓ£¬¹À¼ÆCompile²¢²»Äܸø³ÌÐòÌáËÙ¶àÉÙ£¬Ð»Ð»
6Â¥2013-06-07 19:49:43
ÒÑÔÄ   »Ø¸´´ËÂ¥   ¹Ø×¢TA ¸øTA·¢ÏûÏ¢ ËÍTAºì»¨ TAµÄ»ØÌû

zdzqy

гæ (СÓÐÃûÆø)

ÒýÓûØÌû:
7Â¥: Originally posted by chyanog at 2013-08-03 20:11:32
CompileÒ»µãÒ²²»¼¦Àߣ¬²¢²»ÊÇÖ»ÄܱàÒëһЩ¼òµ¥º¯Êý£¬Ò»Ð©ÊýÖµ¼ÆËã³ÌÐò¿ÉÒÔÌáËÙ30~100±¶ÒÔÉÏ£¬µ«Ê¹ÓÃһЩ¸ß¼¶µÄº¯Êýʱ£¨NSolve£¬NIntegrateµÈ£©¾Íû±ØÒªCompileÁË£¬²»»áÓмÓËÙЧ¹û£¬
ʹÓÃCompilationTarget -> & ...

ºÃµÄ£¬ÎÒÊÔÊÔ£¬ÎҵijÌÐòÀïÉæ¼°µ½µÄÊdzõµÈº¯ÊýµÄ¼Ó¼õ³Ë³ýÔËË㣬°´ÕÕÄãµÄ˼·£¬Ó¦¸ÃÊÇ¿ÉÒÔ¼ÓËÙ²»ÉÙ
8Â¥2013-08-04 20:31:05
ÒÑÔÄ   »Ø¸´´ËÂ¥   ¹Ø×¢TA ¸øTA·¢ÏûÏ¢ ËÍTAºì»¨ TAµÄ»ØÌû

zdzqy

гæ (СÓÐÃûÆø)

ÒýÓûØÌû:
7Â¥: Originally posted by chyanog at 2013-08-03 20:11:32
CompileÒ»µãÒ²²»¼¦Àߣ¬²¢²»ÊÇÖ»ÄܱàÒëһЩ¼òµ¥º¯Êý£¬Ò»Ð©ÊýÖµ¼ÆËã³ÌÐò¿ÉÒÔÌáËÙ30~100±¶ÒÔÉÏ£¬µ«Ê¹ÓÃһЩ¸ß¼¶µÄº¯Êýʱ£¨NSolve£¬NIntegrateµÈ£©¾Íû±ØÒªCompileÁË£¬²»»áÓмÓËÙЧ¹û£¬
ʹÓÃCompilationTarget -> & ...

ÏëÇëÎÊһϣ¬ÏÂÃæµÄÕâ¸öС³ÌÐòÔõôʹÓÃCompileÃüÁî¡£

\!\(\(M1 = \@\(\((x - x1)\)\^2 + \((y - y1)\)\^2\);\)\[IndentingNewLine]
  \(M2 = \@\(\((x - x2)\)\^2 + \((y - y2)\)\^2\);\)\[IndentingNewLine]
  \(M3 = \@\(\((x -
      x3)\)\^2 + \((y - y3)\)\^2\);\)\[IndentingNewLine]\[IndentingNewLine]
  \(M11 = M1*\((\((x1 - x2)\)\ y + x2\ y1 - x1\ y2 + x\ \((\(-
    y1\) + y2)\))\);\)\[IndentingNewLine]
  \(M12 = M2*\((\((x1 - x2)\)\ y + x2\ y1 - x1\ y2 +
    x\ \((\(-y1\) + y2)\))\);\)\[IndentingNewLine]
  \(M13 = M1*\((\((\(-x1\) + x3)\)\ y -
   x3\ y1 + x\ \((y1 - y3)\) + x1\ y3)\);\)\[IndentingNewLine]
  \(M14 = M3*\((\((\(-x1\) + x3)\)\ y -
            x3\ y1 + x\ \((y1 - y3)\) + x1\ y3)\);\)\[IndentingNewLine]
  \(M15 = M2*\((\((x2 - x3)\)\ y + x3\
  y2 - x2\ y3 + x\ \((\(-y2\) + y3)\))\);\)\[IndentingNewLine]
  \(M16 = M3*\((\((x2 - x3)\)\ y +
            x3\ y2 - x2\
                y3 + x\ \((\(-y2\) +
                   y3)\))\);\)\[IndentingNewLine]\[IndentingNewLine]\
\[IndentingNewLine]
  \(QQ = \(\((x -
       x1)\)\ \((x1 - x2)\) + \((y -
           y1)\)\ \((y1 - y2)\)\)\/M11 + \(\((
                  x - x2)\)\ \((\(-x1\) + x2)\) + \((y - y2)\)\ \((\(-
            y1\) + y2)\)\)\/M12 + \(\((x -
        x1)\)\ \((x1 - x3)\) + \((y - y1)\)\ \((y1 - y3)\)\)\/M13 + \(\((x - \
x3)\)\ \((\(-x1\) + x3)\) + \((y - y3)\)\ \((\(-y1\) + y3)\)\)\/M14 + \(\((x \
- x2)\)\ \((x2 - x3)\) + \((y - y2)\)\ \((y2 - y3)\)\)\/M15 + \(\((x - x3)\)\ \
\((\(-x2\) + x3)\) + \((y - y3)\)\ \((\(-y2\) + y3)\)\)\/M16;\)\n\
\[IndentingNewLine]\n
  \(zz1 = \(-b11\)*\((c13*dd11 - s1*\((c33*da11 - e33*db11)\))\)*QQ - \
b21*\((c13*dd21 - s2*\((c33*da21 - e33*db21)\))\)*QQ - b31*\((c13*dd31 - \
s3*\((c33*da31 - e33*db31)\))\)*QQ;\)\[IndentingNewLine]\n
  \(zz2 = \(-b12\)*\((c13*dd11 - s1*\((c33*da11 - e33*db11)\))\)*QQ - \
b22*\((c13*dd21 - s2*\((c33*da21 - e33*db21)\))\)*QQ - b32*\((c13*
  dd31 - s3*\((c33*da31 - e33*db31)\))\)*QQ;\)\n\n\n
  \(dz1 = b11*\((s1*\((e33*da11 + ep33*db11)\) - e31*dd11)\)*QQ + b21*\((
          s2*\((
            e33*da21 + ep33*db21)\) - e31*dd21)\)*QQ + b31*\((s3*\((e33*da31 +
                 ep33*db31)\) - e31*dd31)\)*QQ;\)\n\[IndentingNewLine]
  \(dz2 = b12*\((
            s1*\((e33*da11 + ep33*db11)\) - e31*dd11)\)*QQ + b22*\((s2*\((e33*
                da21 + ep33*db21)\) - e31*dd21)\)*QQ + b32*\((s3*\((
            e33*da31 + ep33*db31)\) - e31*dd31)\)*QQ;\)\n\[IndentingNewLine]
  AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA\
AAAAAAAAAAAAAAAAAAA\[IndentingNewLine]
  \(AA = Array[A, {NN2, NN2}];\)\[IndentingNewLine]\n
  Do[A[\((i - 1)\)*2 + 1, \((j - 1)\)*2 + 1] = zz1 /. {x -> cn[\([i, 1]\)], y \
-> cn[\([i, 2]\)], x1 -> nxx[\([j, 1]\)], x2 -> nxx[\([j, 2]\)], x3 -> \
nxx[\([j, 3]\)], y1 ->
   nyy[\([j, 1]\)], y2 -> nyy[\([j, 2]\)], y3 -> nyy[\([j,
    3]\)]}; \[IndentingNewLine]A[\((i - 1)\)*2 + 1, \((j - 1)\)*2 +
              2] = zz2 /. {x -> cn[\([i,
          1]\)], y -> cn[\([i, 2]\)], x1 -> nxx[\([j, 1]\)],
      x2 -> nxx[\([j,
         2]\)], x3 -> nxx[\([j, 3]\)], y1 -> nyy[\([
          j, 1]\)], y2 -> nyy[\([j, 2]\)], y3 -> nyy[\([j,
             3]\)]}; A[\((i - 1)\)*2 + 2, \((j - 1)\)*2 + 1] =
            dz1 /. {x -> cn[\([i, 1]\)], y ->
          cn[\([i, 2]\)], x1 -> nxx[\([j, 1]\)], x2 -> nxx[\([
            j, 2]\)], x3 -> nxx[\([j, 3]\)], y1 -> nyy[\([
            j, 1]\)], y2 -> nyy[\([j, 2]\)], y3 -> nyy[\([
            j, 3]\)]}; A[\((i - 1)\)*2 + 2, \((j - 1)\)*2 + 2] = dz2 /. {x ->
       cn[\([i, 1]\)], y -> cn[\([i, 2]\)], x1 -> nxx[\([j, 1]\)], x2 ->
            nxx[\([j, 2]\)], x3 -> nxx[\([j,
          3]\)], y1 -> nyy[\([j, 1]\)], y2 -> nyy[\([j,
          2]\)], y3 -> nyy[\([j, 3]\)]}, \[IndentingNewLine]{i, 1,
            NN1}, {j, 1, NN1}]\[IndentingNewLine]
  \)
9Â¥2013-08-05 10:50:18
ÒÑÔÄ   »Ø¸´´ËÂ¥   ¹Ø×¢TA ¸øTA·¢ÏûÏ¢ ËÍTAºì»¨ TAµÄ»ØÌû

walk1997

½ð³æ (ÖøÃûдÊÖ)

ÒýÓûØÌû:
7Â¥: Originally posted by chyanog at 2013-08-03 20:11:32
CompileÒ»µãÒ²²»¼¦Àߣ¬²¢²»ÊÇÖ»ÄܱàÒëһЩ¼òµ¥º¯Êý£¬Ò»Ð©ÊýÖµ¼ÆËã³ÌÐò¿ÉÒÔÌáËÙ30~100±¶ÒÔÉÏ£¬µ«Ê¹ÓÃһЩ¸ß¼¶µÄº¯Êýʱ£¨NSolve£¬NIntegrateµÈ£©¾Íû±ØÒªCompileÁË£¬²»»áÓмÓËÙЧ¹û£¬
ʹÓÃCompilationTarget -> & ...

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10Â¥2013-08-06 23:58:27
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