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Talk:Bailey–Borwein–Plouffe formula

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84: 74: 53: 2037:"Though the BBP formula can directly calculate the value of any given digit of π with less computational effort than formulas that must calculate all intervening digits, BBP remains linearithmic whereby successively larger values of n require increasingly more time to calculate; that is, the "further out" a digit is, the longer it takes BBP to calculate it, just like the standard π-computing algorithms." 22: 2166:
The section "BBP compared to other methods of computing π" states that using bbp to calculate individual digits is 'the fastest way to compute all the digits from 1 to n". This claim seems suspicious to me, because bbp is not the most efficient method for calculating digits of pi on a single (serial)
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Not at all obvious. I mean, all the pop-lit descriptions of it makes it sound like its constant time. You have to not only see the formula, but also think about it for a while. And even then, its not clear: is it time complexity O(N) or O(Nlog N)? I guess maybe its not O(N^2) but that's not obvious.
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In the "The BBP formula for π" section, it claims: "Once this is done, the four summations are put back into the sum to π". We already have been presented a handful of summations in this section. Which "four summations" is it talking about? Seems confusing. Why not write the whole formula at once?
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Borwein et al. (2004) have recently shown that has no Machin-type BBP arctangent formula that is not binary, although this does not rule out a completely different scheme for digit-extraction algorithms in other bases. A beautiful example of a BBP-type formula in a non-integer base is  (34)
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where and are integer polynomials in (Bailey 2000; Borwein and Bailey 2003, pp. 54 and 128-129). Bailey (2000) and Borwein and Bailey (2003, pp. 128-129) give a collection of such formulas:    (2)    (3)    (4)    (5)    (6)    (7)    (8)    (9)    (10)
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the constant characters in the above render as "Unicode Character 'OBJECT REPLACEMENT CHARACTER' (U+FFFC)" on my system (MacOS X 10.13.4 Beta 17E197a). This is in both the page-view and edit-view. Is there a way to extract the Unicode code point hex from the page, or was this lost when
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I added a citation and removed the "citations-needed" (refimprove) message. I've studied this area at least a small amount, and do not think that its a requirement that further citations be added. Yes, of course there are likely more, but I think the current amount is adequate.
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When I first heard about this it was presented as if you could calculate the n:th digit in constant time which would have been truly amazing. Maybe it is immediately obvious to some that is not the case(?) but i doubt it is to everyone not familiar with the subject.
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The whole article seems to be about finding the nth digit of pi, yet doesn't even once state the formula for it. It has a formula for pi, and an explanation of digit-extraction--but never states what the digit extraction formula actually is, as a whole.
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where is Catalan's constant, is the hyperbolic volume of the figure eight knot complement, is Clausen's integral, and is also the hyperbolic volume of the knot complement of the figure eight knot. Another example is the Dirichlet L-series  (32)
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Near the top the article says "This does not compute the nth decimal of π (i.e., in base 10).", which I think is true but could be taken as meaning, it is impossible to calculate the nth decimal digit by itself, whereas mathworld says it is. See
912: 602: 181:(Bailey and Borwein 2005; Bailey et al. 2007, pp. 5 and 62). Note that this sort of sum is closely related to the polygamma function since, for example, the above sum can also be written  (33) 2016: 1840: 1555: 140: 2025:
I for one would be very grateful if someone could post a piece of pseudocode for how the n:th digit of pi is calculated. Please, do add this. Earl of Warwick 11:03, 28 February 2012 (UTC)
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Reference seems to made to a formula that, for any positive integer n, computes the n-th binary digit of pi, but no such formula is shown. I expect to see something like
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computer. Furthermore, the source cited at the end of the paragraph does not corroborate said statement. Is there an alternative source for it that i missed?
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The proof begins by finding the arctangent and Ln components for the expression below for g=(1,2,3,4,5,6,7)and solving various linear equations
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The "citation-needed" that has appeared is slightly idiotic. A citation is hardly possible for a general assumption.
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where is the golden ratio, found by B. Cloitre (Cloitre; Borwein and Chamberland 2005; Bailey et al. 2007, p. 277).
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link). I changed the formulas a bit and think I discovered an error (multiplication by 16 instead of 16^n). --
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01:47, 7 Jan 2005 (UTC) A base- BBP-type formula is a convergent series formula of the type  (1)
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on Knowledge. If you would like to participate, please visit the project page, where you can join
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It should be pretty obvious. From the formula you can already see that you would need at least a
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I think the following is important enough that it should be mentioned in the intro:
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and the other part increases, which slows down the convergence rate (i.e. causes
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Could the text be rephrased? Or perhaps just delete the sentence? Bill
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One is left feeling that maybe there's some trick one didn't think of.
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At first, I was confused, too, but then I followed the link to
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https://mathworld.wolfram.com/Digit-ExtractionAlgorithm.html
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already present as the first equation in the entire article
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when you wrote this comment, and it is still there now.
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Using the later identity and this arctangent relation
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Most efficient method for parallel computation of pi?
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n-th digit of pi = ... some formula involving n ...
101:, a collaborative effort to improve the coverage of 2093: 2010: 1834: 1647: 1549: 993: 906: 596: 2011:{\displaystyle \pi =\sum _{k=0}^{\infty }\left} 1835:{\displaystyle \pi =\sum _{k=0}^{\infty }\left} 1550:{\displaystyle \pi =\sum _{k=0}^{\infty }\left} 162:I translated the article into German (see the 8: 19: 2286: 2264: 2192: 1648:{\displaystyle \sum _{k=0}^{\infty }\left} 47: 2329:What is the utility of hexadecimal here? 2079: 2068: 2062: 1977: 1953: 1929: 1905: 1892: 1883: 1872: 1861: 1849: 1801: 1777: 1753: 1729: 1716: 1707: 1696: 1685: 1673: 1614: 1608: 1598: 1583: 1572: 1566: 1512: 1506: 1478: 1472: 1444: 1438: 1410: 1404: 1376: 1370: 1342: 1336: 1308: 1302: 1274: 1268: 1240: 1234: 1206: 1200: 1172: 1166: 1138: 1132: 1107: 1101: 1076: 1070: 1054: 1045: 1034: 1023: 1011: 977: 950: 924: 922: 869: 863: 835: 829: 801: 795: 767: 761: 733: 727: 699: 693: 677: 668: 657: 646: 625: 613: 559: 553: 525: 519: 491: 485: 457: 451: 423: 417: 389: 383: 367: 358: 347: 336: 315: 303: 49: 295:BBP for arctan (1/3) and arctan (1/7) 7: 277:BBP digit-extraction algorithm for π 95:This article is within the scope of 38:It is of interest to the following 2285:See the sixth line from the top. 2182:Formula to calculate the nth digit 2101:-style calculation to compute the 1873: 1697: 1584: 1035: 658: 348: 228:They were saved here as U+FFFC. -- 14: 2358:Mid-priority mathematics articles 2094:{\displaystyle \sum _{k=n}^{n+C}} 115:Knowledge:WikiProject Mathematics 2353:Start-Class mathematics articles 214:entered the text to begin with? 118:Template:WikiProject Mathematics 82: 72: 51: 20: 256:Maybe I'm expecting too much? 135:This article has been rated as 2227:04:16, 13 September 2019 (UTC) 1: 2154:18:23, 22 December 2020 (UTC) 2109:increases, the ratio between 109:and see a list of open tasks. 2317:20:54, 11 January 2021 (UTC) 2052:15:16, 21 October 2013 (UTC) 2374: 2301:13:54, 26 March 2019 (UTC) 2279:13:08, 26 March 2019 (UTC) 2207:01:49, 20 March 2019 (UTC) 2139:22:46, 14 March 2015 (UTC) 1844:This can be simplified to 238:17:35, 30 March 2018 (UTC) 224:15:20, 30 March 2018 (UTC) 2254:19:18, 6 March 2022 (UTC) 2177:11:12, 11 July 2016 (UTC) 289:10:03, 20 July 2010 (UTC) 266:00:18, 5 March 2010 (UTC) 200:02:40, 5 March 2009 (UTC) 134: 67: 46: 2339:12:35, 26 May 2024 (UTC) 246:Confusion from the start 141:project's priority scale 1665:Simplification possible 98:WikiProject Mathematics 2095: 2090: 2012: 1877: 1836: 1701: 1660:http://iamned.com/math 1649: 1588: 1551: 1039: 995: 908: 662: 598: 352: 28:This article is rated 2233:Not decimal confusing 2096: 2064: 2013: 1857: 1837: 1681: 1650: 1568: 1552: 1019: 996: 909: 642: 599: 332: 2061: 1848: 1672: 1565: 1010: 921: 612: 302: 121:mathematics articles 2091: 2008: 1832: 1645: 1547: 991: 904: 594: 90:Mathematics portal 34:content assessment 2303: 2291:comment added by 2281: 2269:comment added by 2209: 2197:comment added by 1996: 1972: 1948: 1924: 1898: 1820: 1796: 1772: 1748: 1722: 1634: 1535: 1501: 1467: 1433: 1399: 1365: 1331: 1297: 1263: 1229: 1195: 1161: 1127: 1096: 1063: 985: 958: 932: 892: 858: 824: 790: 756: 722: 686: 633: 582: 548: 514: 480: 446: 412: 376: 323: 155: 154: 151: 150: 147: 146: 2365: 2213:The formula was 2129:to increase). -- 2124: 2122: 2121: 2118: 2115: 2100: 2098: 2097: 2092: 2089: 2078: 2017: 2015: 2014: 2009: 2007: 2003: 2002: 1998: 1997: 1995: 1978: 1973: 1971: 1954: 1949: 1947: 1930: 1925: 1923: 1906: 1899: 1897: 1896: 1884: 1876: 1871: 1841: 1839: 1838: 1833: 1831: 1827: 1826: 1822: 1821: 1819: 1802: 1797: 1795: 1778: 1773: 1771: 1754: 1749: 1747: 1730: 1723: 1721: 1720: 1708: 1700: 1695: 1654: 1652: 1651: 1646: 1644: 1640: 1639: 1635: 1633: 1619: 1618: 1609: 1603: 1602: 1587: 1582: 1556: 1554: 1553: 1548: 1546: 1542: 1541: 1537: 1536: 1534: 1520: 1519: 1507: 1502: 1500: 1486: 1485: 1473: 1468: 1466: 1452: 1451: 1439: 1434: 1432: 1418: 1417: 1405: 1400: 1398: 1384: 1383: 1371: 1366: 1364: 1350: 1349: 1337: 1332: 1330: 1316: 1315: 1303: 1298: 1296: 1282: 1281: 1269: 1264: 1262: 1248: 1247: 1235: 1230: 1228: 1214: 1213: 1201: 1196: 1194: 1180: 1179: 1167: 1162: 1160: 1146: 1145: 1133: 1128: 1126: 1112: 1111: 1102: 1097: 1095: 1081: 1080: 1071: 1064: 1062: 1061: 1046: 1038: 1033: 1000: 998: 997: 992: 990: 986: 978: 963: 959: 951: 933: 925: 913: 911: 910: 905: 903: 899: 898: 894: 893: 891: 877: 876: 864: 859: 857: 843: 842: 830: 825: 823: 809: 808: 796: 791: 789: 775: 774: 762: 757: 755: 741: 740: 728: 723: 721: 707: 706: 694: 687: 685: 684: 669: 661: 656: 638: 634: 626: 603: 601: 600: 595: 593: 589: 588: 584: 583: 581: 567: 566: 554: 549: 547: 533: 532: 520: 515: 513: 499: 498: 486: 481: 479: 465: 464: 452: 447: 445: 431: 430: 418: 413: 411: 397: 396: 384: 377: 375: 374: 359: 351: 346: 328: 324: 316: 273:Spigot algorithm 168:Marc van Woerkom 123: 122: 119: 116: 113: 92: 87: 86: 76: 69: 68: 63: 55: 48: 31: 25: 24: 16: 2373: 2372: 2368: 2367: 2366: 2364: 2363: 2362: 2343: 2342: 2327: 2261: 2235: 2184: 2169:131.174.192.244 2164: 2119: 2116: 2113: 2112: 2110: 2059: 2058: 2031: 2029:Time complexity 2023: 1982: 1958: 1934: 1910: 1904: 1900: 1888: 1882: 1878: 1846: 1845: 1806: 1782: 1758: 1734: 1728: 1724: 1712: 1706: 1702: 1670: 1669: 1667: 1620: 1610: 1604: 1594: 1593: 1589: 1563: 1562: 1521: 1508: 1487: 1474: 1453: 1440: 1419: 1406: 1385: 1372: 1351: 1338: 1317: 1304: 1283: 1270: 1249: 1236: 1215: 1202: 1181: 1168: 1147: 1134: 1113: 1103: 1082: 1072: 1069: 1065: 1050: 1044: 1040: 1008: 1007: 973: 946: 919: 918: 878: 865: 844: 831: 810: 797: 776: 763: 742: 729: 708: 695: 692: 688: 673: 667: 663: 621: 610: 609: 568: 555: 534: 521: 500: 487: 466: 453: 432: 419: 398: 385: 382: 378: 363: 357: 353: 311: 300: 299: 297: 254: 248: 160: 120: 117: 114: 111: 110: 88: 81: 61: 32:on Knowledge's 29: 12: 11: 5: 2371: 2369: 2361: 2360: 2355: 2345: 2344: 2326: 2323: 2322: 2321: 2320: 2319: 2260: 2257: 2234: 2231: 2230: 2229: 2199:173.179.131.54 2183: 2180: 2163: 2160: 2159: 2158: 2157: 2156: 2105:-th digit. 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216:Jimw338 164:Deutsch 139:on the 968:arctan 941:arctan 616:arctan 306:arctan 36:scale. 2335:talk 2313:talk 2297:talk 2275:talk 2250:talk 2223:talk 2203:talk 2173:talk 2150:talk 2135:talk 2048:talk 285:talk 279:. – 262:talk 234:talk 220:talk 196:talk 207:All 131:Mid 2349:: 2337:) 2325:0x 2315:) 2299:) 2277:) 2259:CN 2252:) 2225:) 2205:) 2175:) 2152:) 2137:) 2120:16 2066:∑ 2050:) 1975:− 1951:− 1927:− 1890:16 1874:∞ 1859:∑ 1852:π 1799:− 1775:− 1751:− 1714:16 1698:∞ 1683:∑ 1676:π 1585:∞ 1570:∑ 1517:16 1514:− 1483:11 1480:− 1446:− 1436:− 1412:− 1402:− 1396:19 1387:20 1381:16 1378:− 1368:− 1362:17 1353:20 1347:14 1344:− 1328:15 1319:20 1313:14 1310:− 1294:13 1285:20 1279:10 1276:− 1260:11 1251:20 1242:− 1232:− 1217:20 1208:− 1183:20 1174:− 1164:− 1149:20 1140:− 1130:− 1115:20 1099:− 1084:20 1056:20 1036:∞ 1021:∑ 1014:π 971:⁡ 965:− 944:⁡ 927:π 874:18 871:− 861:− 840:15 837:− 827:− 806:13 803:− 793:− 769:− 735:− 701:− 679:20 659:∞ 644:∑ 619:⁡ 564:11 561:− 551:− 527:− 517:− 493:− 483:− 459:− 425:− 391:− 369:12 349:∞ 334:∑ 309:⁡ 287:) 264:) 236:) 222:) 198:) 2333:( 2311:( 2295:( 2273:( 2248:( 2221:( 2201:( 2171:( 2148:( 2133:( 2127:C 2123:⁠ 2117:/ 2114:1 2111:⁠ 2107:n 2103:n 2087:C 2084:+ 2081:n 2076:n 2073:= 2070:k 2046:( 2005:] 2000:) 1993:6 1990:+ 1987:k 1984:8 1980:1 1969:5 1966:+ 1963:k 1960:8 1956:1 1945:2 1942:+ 1939:k 1936:4 1932:1 1921:1 1918:+ 1915:k 1912:8 1908:4 1902:( 1894:k 1886:1 1880:[ 1869:0 1866:= 1863:k 1855:= 1829:] 1824:) 1817:6 1814:+ 1811:k 1808:8 1804:1 1793:5 1790:+ 1787:k 1784:8 1780:1 1769:4 1766:+ 1763:k 1760:8 1756:2 1745:1 1742:+ 1739:k 1736:8 1732:4 1726:( 1718:k 1710:1 1704:[ 1693:0 1690:= 1687:k 1679:= 1642:] 1637:) 1631:g 1628:+ 1625:k 1622:8 1616:g 1612:a 1606:( 1600:k 1596:m 1591:[ 1580:0 1577:= 1574:k 1544:] 1539:) 1532:7 1529:+ 1526:k 1523:8 1510:2 1504:+ 1498:5 1495:+ 1492:k 1489:8 1476:2 1470:+ 1464:3 1461:+ 1458:k 1455:8 1449:6 1442:2 1430:1 1427:+ 1424:k 1421:8 1415:1 1408:2 1393:+ 1390:k 1374:2 1359:+ 1356:k 1340:2 1334:+ 1325:+ 1322:k 1306:2 1300:+ 1291:+ 1288:k 1272:2 1266:+ 1257:+ 1254:k 1245:8 1238:2 1226:9 1223:+ 1220:k 1211:6 1204:2 1198:+ 1192:7 1189:+ 1186:k 1177:4 1170:2 1158:5 1155:+ 1152:k 1143:4 1136:2 1124:3 1121:+ 1118:k 1109:0 1105:2 1093:1 1090:+ 1087:k 1078:2 1074:2 1067:( 1059:k 1052:2 1048:1 1042:[ 1031:0 1028:= 1025:k 1017:= 988:) 983:7 980:1 975:( 961:) 956:2 953:1 948:( 938:2 935:= 930:4 901:] 896:) 889:7 886:+ 883:k 880:8 867:2 855:6 852:+ 849:k 846:8 833:2 821:5 818:+ 815:k 812:8 799:2 787:3 784:+ 781:k 778:8 772:8 765:2 759:+ 753:2 750:+ 747:k 744:8 738:5 731:2 725:+ 719:1 716:+ 713:k 710:8 704:3 697:2 690:( 682:k 675:2 671:1 665:[ 654:0 651:= 648:k 640:= 636:) 631:7 628:1 623:( 591:] 586:) 579:7 576:+ 573:k 570:8 557:2 545:6 542:+ 539:k 536:8 530:9 523:2 511:5 508:+ 505:k 502:8 496:8 489:2 477:3 474:+ 471:k 468:8 462:5 455:2 449:+ 443:2 440:+ 437:k 434:8 428:3 421:2 415:+ 409:1 406:+ 403:k 400:8 394:2 387:2 380:( 372:k 365:2 361:1 355:[ 344:0 341:= 338:k 330:= 326:) 321:3 318:1 313:( 283:( 260:( 232:( 218:( 194:( 143:. 42::

Index


content assessment
WikiProjects
WikiProject icon
Mathematics
WikiProject icon
icon
Mathematics portal
WikiProject Mathematics
mathematics
the discussion
Mid
project's priority scale
Marc van Woerkom
Chadman8000
talk
02:40, 5 March 2009 (UTC)
Chadman8000
Jimw338
talk
15:20, 30 March 2018 (UTC)
bdijkstra
talk
17:35, 30 March 2018 (UTC)
213.122.8.48
talk
00:18, 5 March 2010 (UTC)
Spigot algorithm
BBP digit-extraction algorithm for π
Adrianwn

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