/
DIVAnd_sampler.jl
78 lines (51 loc) · 2.11 KB
/
DIVAnd_sampler.jl
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
"""
samplesteps = DIVAnd_sampler(pmn,len);
# Defines steps for sub-sampling in the discrete grid which would still allow
one to resolve the provided lengthscales
# Input:
* `pmn`: scale factor of the grid. pmn is a tuple with n elements. Every
element represents the scale factor of the corresponding dimension. Its
inverse is the local resolution of the grid in a particular dimension.
* `len`: correlation length
# Output:
* `samplesteps`: vector of integers with steps in subsampling [1 2 4 1] means every grid point in x direction, every fifth in y etc
"""
function DIVAnd_sampler(pmn, len)
# TO DO: in a single sweep compute both minimum and maximum with function extrema
# Usefull for DIVAndgo and DIVAndjog
n = ndims(pmn[1])
samplesteps = ones(Int, n)
Labspmnmin = zeros(n)
for i = 1:n
if isa(len, Number)
Labspmnmin[i] = len * minimum(pmn[i])
elseif isa(len, Tuple)
if isa(len[1], Number)
Labspmnmin[i] = len[i] * minimum(pmn[i])
else
Labspmnmin[i] = minimum(len[i] .* pmn[i])
end
end
nsamp = Int(floor(Labspmnmin[i] / 3))
if nsamp > 1
samplesteps[i] = nsamp
end
end
return samplesteps
end
# Copyright (C) 2008-2017 Alexander Barth <barth.alexander@gmail.com>
# Jean-Marie Beckers <JM.Beckers@ulg.ac.be>
#
# This program is free software; you can redistribute it and/or modify it under
# the terms of the GNU General Public License as published by the Free Software
# Foundation; either version 2 of the License, or (at your option) any later
# version.
#
# This program is distributed in the hope that it will be useful, but WITHOUT
# ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
# FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more
# details.
#
# You should have received a copy of the GNU General Public License along with
# this program; if not, see <http://www.gnu.org/licenses/>.
# LocalWords: fi DIVAnd pmn len diag CovarParam vel ceil moddim fracdim