1. tab calc — column calculator
Alexey Mints
October 8, 2012
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2. Problem
; Analytical estimate
; N = 2000
; M= 1.00000000000000
0.100000000000000 0.194963273695390 0.452280145149274
0.200000000000000 9 . 3 9 4 8 1 1 3 3 8 7 4 0 7 8 8 E−002 0.323391367380061
0.300000000000000 4 . 0 8 4 7 2 9 0 1 0 5 3 5 5 8 9 E−002 0.200191059613909
0.400000000000000 4 . 2 9 2 7 0 7 4 6 6 9 8 4 7 8 7 E−003 7 . 6 5 7 4 8 4 9 8 6 0 7 8 4 8 9 E−002
0.500000000000000 −7.612910840109233E−003 9 . 8 3 1 3 0 0 4 7 7 3 6 1 0 3 0 E−003
0.600000000000000 −5.107206163155024E−003 9 . 5 1 7 3 0 6 8 6 6 8 2 9 3 1 6 E−005
0.700000000000000 −2.542372564188784E−003 1 . 3 2 9 2 2 9 0 5 4 0 6 7 5 4 8 E−008
0.800000000000000 −1.361691080886834E−003 4 . 5 8 5 6 3 6 6 4 7 3 9 0 3 3 8 E−015
0.900000000000000 −7.643529836984155E−004 2 . 0 5 8 0 4 3 7 7 6 5 8 4 1 9 3 E−025
1.00000000000000 −4.424826178663354E−004 2 . 1 3 3 2 5 4 0 1 4 1 1 9 3 8 8 E−041
1.10000000000000 −2.612563088200786E−004 1 . 0 0 9 6 9 8 7 0 4 5 2 1 4 6 9 E−070
1.20000000000000 −1.556945721021596E−004 2 . 8 1 2 5 4 3 5 0 8 5 7 6 5 0 4 E−115
1.30000000000000 −9.248354070395218E−005 7 . 9 7 9 0 4 6 0 7 4 1 8 2 6 0 7 E−181
1.40000000000000 −5.375035345279097E−005 9 . 7 3 6 2 0 5 3 0 5 4 9 5 6 8 0 E−275
1.50000000000000 −2.955319774665858E−005 0.00000000000000
1.60000000000000 −1.418167774705137E−005 0.00000000000000
1.70000000000000 −4.203683556061041E−006 0.00000000000000
1.80000000000000 2 . 7 0 8 6 3 7 0 2 5 0 0 1 5 2 6 E−006 0.00000000000000
1.90000000000000 8 . 5 6 4 2 3 1 2 1 1 6 3 4 4 6 1 E−006 0.00000000000000
2.00000000000000 1 . 5 4 0 8 6 4 9 3 6 6 0 8 1 5 8 E−005 0.00000000000000
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3. Motivation
Everyday need in simple (and not very simple too)
operations on data files;
No tool can do everything I want;
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4. Here it comes!
FORTRAN-based → extremely quick!
−
Column/row counts detected on-the-fly.
IO and commands are independent.
∼ 30 commands ready.
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5. Basic commands
sum, average, minimum, maximum;
median, geometric and harmonic means;
dispersion, skewness and moments;
sorting;
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6. Advanced commands
Histograms (1- and 2-dimensional);
Distributions (1- and 2-dimensional);
Fit (linear and power-law);
Table function integration, zero- and extremum-
finding.
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7. Group-by option
Allows grouping by several (non-string) columns;
Works only for several simple commands;
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8. Future
Python experiments (slow...);
Better string support.
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