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Merge pull request #1476 from uihsnv/log_spacing

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A function logfreq3(), for logarithmic spacing
This commit is contained in:
Axel Kohlmeyer
2019-06-17 14:12:59 -04:00
committed by GitHub
parent 2f29bd29f4 cea1bd9cd9
commit 6536399fc3
2 changed files with 84 additions and 14 deletions
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16
doc/src/variable.txt
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@ -52,7 +52,7 @@ style = {delete} or {index} or {loop} or {world} or {universe} or {uloop} or {st
sin(x), cos(x), tan(x), asin(x), acos(x), atan(x), atan2(y,x),
random(x,y,z), normal(x,y,z), ceil(x), floor(x), round(x)
ramp(x,y), stagger(x,y), logfreq(x,y,z), logfreq2(x,y,z),
stride(x,y,z), stride2(x,y,z,a,b,c),
logfreq3(x,y,z), stride(x,y,z), stride2(x,y,z,a,b,c),
vdisplace(x,y), swiggle(x,y,z), cwiggle(x,y,z)
group functions = count(group), mass(group), charge(group),
xcm(group,dim), vcm(group,dim), fcm(group,dim),
@ -459,8 +459,8 @@ Math functions: sqrt(x), exp(x), ln(x), log(x), abs(x), \
sin(x), cos(x), tan(x), asin(x), acos(x), atan(x), atan2(y,x), \
random(x,y,z), normal(x,y,z), ceil(x), floor(x), round(x), \
ramp(x,y), stagger(x,y), logfreq(x,y,z), logfreq2(x,y,z), \
stride(x,y,z), stride2(x,y,z,a,b,c), vdisplace(x,y), \
swiggle(x,y,z), cwiggle(x,y,z)
logfreq3(x,y,z), stride(x,y,z), stride2(x,y,z,a,b,c), \
vdisplace(x,y), swiggle(x,y,z), cwiggle(x,y,z)
Group functions: count(ID), mass(ID), charge(ID), xcm(ID,dim), \
vcm(ID,dim), fcm(ID,dim), bound(ID,dir), \
gyration(ID), ke(ID), angmom(ID,dim), torque(ID,dim), \
@ -670,6 +670,16 @@ sequence of output timesteps:
100,150,200,...950,1000,1500,2000,...9500,10000,15000,etc :pre
The logfreq3(x,y,z) function generates y points between x and z (inclusive),
that are separated by a multiplicative ratio: (z/x)^(1/(y-1)). Constraints
are: x,z > 0, y > 1, z-x >= y-1. For eg., if logfreq3(10,25,1000) is used in
a variable by the "fix print"_fix_print.html command, then the interval
between 10 and 1000 is divided into 24 parts with a multiplicative
separation of ~1.21, and it will generate the following sequence of output
timesteps:
10, 13, 15, 18, 22, 27, 32,...384, 465, 563, 682, 826, 1000 :pre
The stride(x,y,z) function uses the current timestep to generate a new
timestep. X,y >= 0 and z > 0 and x <= y are required. The generated
timesteps increase in increments of z, from x to y, i.e. it generates