Question

我有一个有几处田的管道有限饲料档案。自2006年以来我只需要几个方面,我想利用awk来为我的测试目的而加以捕获。但是,我注意到,<><>>>>如果我使用%d”,则对数值作了改动。如果我使用<><><>>>%s>,则该编码可操作。

Feed File Sample:

<><>>>[雅斯特:~/Temp] cat temp

<>strong30261000741 19769909943390313:20:02:02:606-01-2012:20:03.307 00:0017:20:20:03.03.307 007 00 007 00 007 00 007 007 007 007 007 007 007 480 480 480 0044 _______________________________________________________________________________________________________________________________________________0403030390 _____________0 _________________________________________________________________0 MOBIL CELLULAR, INC INCBELL MOBILITY CELLULAR, INCBellITY MX ARGENTINA SA. Claro aka C. C Movil, RG, TI/code>


我有兴趣了解second栏。 http://strong>197699043993903。
Here are my tests:
[jaypal:~/Temp] awk -F"|"  {printf ("%d
",$2)}  temp
19769904399993904   # Value is changed

但是,以下两项测试是有效的:
[jaypal:~/Temp] awk -F"|"  {printf ("%s
",$2)}  temp
19769904399993903   # Value remains same

[jaypal:~/Temp] awk -F"|"  {print $2}  temp
19769904399993903   # Value remains same

因此,%d”的限额无法处理长期分类账。 如果是这样,为什么要增加一个而不是缩小这个数目?
我已用<<><<>条码>>和(<>条码>/code>>版<<><><><><><>><>>><>>>>进行了尝试。
Version Info:
[jaypal:~/Temp] gawk --version
GNU Awk 4.0.0
Copyright (C) 1989, 1991-2011 Free Software Foundation.

[jaypal:~/Temp] awk --version
awk version 20070501

Answer 1

我认为,本案的基本数字格式是“电子计算方法”的两倍。因此,变值是浮动点准确错误的结果。如果实际需要将大数值作为数字处理,并保持准确的准确性,那么最好使用像Perl、Riu、或Ze等有能力(可能通过延伸)处理武断的算术的东西。

Answer 2

http://git.savannah.gnu.org/cgit/gawk.git/tree/doc/gawk.1?id=gawk-4.1.0#n345“rel=“noreferer” 页: 1

$ awk  BEGIN {print 19769904399993903} 
19769904399993904

$ awk --bignum  BEGIN {print 19769904399993903} 
19769904399993903

Answer 3

www.un.org/Depts/DGACM/index_spanish.htm 最近版本的GNU awk支持武断的精确度。 See the

ORIGINAL POST CONTENT: XMLgawk supports arbitrary precision arithmetic on floating-point numbers. So, if installing xgawk is an option:

zsh-4.3.11[drado]% awk --version |head -1; xgawk --version | head -1
GNU Awk 4.0.0
Extensible GNU Awk 3.1.6 (build 20080101) with dynamic loading, and with statically-linked extensions

zsh-4.3.11[drado]% awk  BEGIN {
  x=665857
  y=470832
  print x^4 - 4 * y^4 - 4 * y^2
  } 
11885568

zsh-4.3.11[drado]% xgawk -lmpfr  BEGIN {
  MPFR_PRECISION = 80
  x=665857
  y=470832
  print mpfr_sub(mpfr_sub(mpfr_pow(x, 4), mpfr_mul(4, mpfr_pow(y, 4))), 4 * y^2)
  } 
1.0000000000000000000000000

Answer 4

This answer was partially answered by @Mark Wilkins and @Dennis Williamson already but I found out the largest 64-bit integer that can be handled without losing precision is 2^53. Eg awk s reference page http://www.gnu.org/software/gawk/manual/gawk.html#Integer-Programming

(sorry if my answer is too old. Figured I d still share for the next person before they spend too much time on this like I did)

Answer 5

页: 1 Awk s Floating Point Represent Issues。我不认为,你可以在一夫一妻框架内找到工作,准确计算大量数字。

我认为,只有可能的(和粗略的)方式,才能将巨额资金细分为小丘,重复计算并再次使用,或更好地利用比高强的Perl/PHP/TCL/bsh等文字。

Answer 6

Using nawk on Solaris 11, I convert the number to a string by adding (concatenate) a null to the end, and then use %15s as the format string:

printf("%15s
", bignum "")

Answer 7


another caveat about the precision :
the errors pile up with extra operations ::
echo 19769904399993903 | mawk2  { CONVFMT = "%.2000g";
                                     OFMT =   "%.20g"; 
        } {
           print;
           print +$0; 
           print $0/1.0
           print $0^1.0; 

           print exp(-log($0))^-1; 
           print exp(1*log($0))
           print sqrt(exp(exp(log(20)-log(10))*log($0))) 
           print (exp(exp(log(6)-log(3))*log($0)))^2^-1   
        } 


19769904399993903
19769904399993904
19769904399993904
19769904399993904
19769904399993912
19769904399993908



19769904399993628 <<<—— -275
19769904399993768 <<<—- -135


The first few only off by less than 10.
last 2 equations have triple digit deltas.
对于任何需要打电话帮助者数学功能的版本来说,仅仅获得M牌大金是不够的。 还必须确定PREC变量。
对于这种外在物质而言,PREC=64和OFMT=%.17g>应当足够。
相对于巴勒斯坦经济共同体而言,你知道如何将外汇储备定得太高,否则就象这样:
gawk -M -v PREC=256 -e  { CONVFMT="%.2000g"; OFMT="%.80g";... }  

19769904399993903
19769904399993903.000000000000000000000000000000000000000000000000000000000003734
19769904399993903.000000000000000000000000000000000000000000000000000000000003734
19769904399993903.000000000000000000000000000000000000000000000000000000000003734
19769904399993903.000000000000000000000000000000000000000000000000000000000003734

自80 重要数字以来,至少需要精确到265.75,因此基本上需要<代码>266-bits,但gawk已经足够快,你可能安全地在PREC=4096/8192之前就安装这一系统,而不是每时都不得不担心。

Feed File Sample:

Here are my tests:

Version Info:

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