COMMAND LINE OPTIONS FOR MWRANK
Since December 1997, mwrank supports command-line options instead of
prompting the user. All options have reasonable defaults.
List of command line options, their meaning and default values (set in options.h)
[q, l, t take no parameters; the others take an integer parameter "n"]
-h help Displays a summary of this info and quits
-q quiet mode flag
Suppresses the header information (including
the date of compilation) which is otherwise output
and should be included in any problem/bug reports).
Default is off (i.e. not quiet). Also
suppresses prompting for curves
-v n verbosity level
Controls amount of output. Range 0..3.
Default=1. Level 0 only outputs the rank.
Use "-q -v 0" for minimal output, but note
that if you also have "-c n" with nonzero n
then you will cause a point search to be
carried out, but you will not see its results!
(Unless -o is used).
Details of point search only shown if
verbosity is > 1.
-o output pari Outputs a very terse summary of the results
for use by PARI/GP with suitable interface.
Format:
Either [[r],[P1,P2,...,Pr]]
where r is the rank and P1,...,Pr are r
independent points;
or [[r,r'],[P1,P2,...,Pr]]
where r and r' are lower and upper bounds
on the rank and P1,...,Pr are r
independent points;
Can be used in addition to other output
options (controlled by -v); for minimal useful
output use "-q -v 0 -o"
-p n precision (#bits)
Only relevant for the multiprecision
floating point version. Range 1..large,
default 50. This is bit precision.
Stringly recommended to increase for curves
with 2-torsion where a second descent is used
since then the reduction applied to second
descent quartics is more effective.
-b n height bound for quartic point search.
Range 1..15, default 10.
-x n number of auxiliary primes used for syzygy sieving.
Range 0..,default 15. Only relevant for curves
with no 2-torsion. Worth increasing
either for curves with large discriminant, or
for curves with suspected large rank r, for
which r+1 or r+2 are suitable values.
-l points output flag.
Controls whether generating points are output.
Defaults to value of "verbosity", so the only
function is to turn this part of the output on
when verbosity is 0 (i.e. -v 0 -l).
-t quartic equivalence test flag.
For debugging only. Default off.
-s selmer_only If set, does local tests on homogeneous spaces
only, which can be much quicker for curves
with 2-torsion. NB for curves with no
2-torsion this computes the 2-Selmer rank
exactly; for curves with 2-torsion it
computes an upper bound for the rank based on
various Selmer groups, possibly less than that
from the 2-Selmer group itself.
If unset (the default) then rational points
are sought, to give a lower bound for the rank
also.
-d skip_2nd_descent Only relevant for curves with 2-torsion;
unset by default. If set, does no second
descent either locally or globally, which in
general gives a larger upper bound for the
rank and a smaller lower bound.
I recommend setting this if using mwrank with
no multiprecision floating point arithmetic.
-S saturation_bound (non-negative integer or -1) controls saturation
0: do no saturation at all
n: use n as upper bound for saturation primes
-1: allow progam to determine upper bound
automatically (but that will be reduced to a
default maximum of 100 if it is greater)
Last update: 2016-01-02
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