cf90b764f8
calculation was for nyquist freq not fully correct.
...
See Notes on FFT-based differentiation
Steven G. Johnson, MIT Applied Mathematics
Created April, 2011, updated May 4, 2011:
2015-09-05 11:51:36 +00:00
08f8746182
made some more scripts working again
2015-08-31 21:22:44 +00:00
8ff79e1eb0
NaN now considered transparent
2015-08-31 17:41:00 +00:00
8f79744f2c
now works with (rounded) floating point numbers as mapping indices
2015-08-31 16:01:11 +00:00
6100185855
switch to new ASCII table class was buggy, using damask.util.emph
2015-08-31 11:00:45 +00:00
115518a2c8
minor changes in commit and setting the script ID properly
2015-08-29 15:10:43 +00:00
cff6307779
Update existing value(s) to expression(s) respecting condition.
2015-08-29 00:54:45 +00:00
b4768013a0
fix output error in output geom file.
2015-08-26 16:39:33 +00:00
d8afe9be23
Add scalars, vectors, and/or an RGB tuple from an ASCIItable to existing VTK rectilinear grid (.vtr/.vtk).
2015-08-25 00:39:37 +00:00
cec6d7d220
for generating rectilinear grid of either cell type or point type from ASCII table.
2015-08-24 20:48:50 +00:00
7961b486cb
now compatible with updated Orientation.disorientation() output, i.e., select item [0] (the quaternion).
2015-08-24 14:20:09 +00:00
c215139ce1
now works with recent changes of ASCIItable and with STDIN to STDOUT.
2015-08-24 14:01:24 +00:00
afc88c7029
now works with recent changes of ASCIItable.
2015-08-24 13:42:29 +00:00
38992fdc37
now use outsourced damask.util methods
2015-08-23 23:19:40 +00:00
00b8660203
redundant.
...
functionality available in “geom_fromTable”…
2015-08-20 19:46:11 +00:00
c85306257d
redundant.
...
improved functionality now via “ang_toTable” and “geom_fromTable”…
2015-08-20 19:44:17 +00:00
63d5506388
adopting further simplifications provided through ASCIItable class.
2015-08-20 19:42:05 +00:00
9439cf7278
add cumulative (first to current) values of given labels to table
2015-08-20 19:40:45 +00:00
05a8124d82
simplified rescaling interpretation
2015-08-19 18:30:50 +00:00
2a13d78196
did not run
2015-08-18 17:24:15 +00:00
324c5b36d3
restructured to get help even without mentat release
2015-08-18 16:39:47 +00:00
70daa8663f
adoption of new ASCIItable API
2015-08-18 14:37:32 +00:00
ca1fe6bb82
updated to new ASCII table style
2015-08-18 07:56:03 +00:00
d0b75b5a10
fixed table.croak error in last commit
2015-08-18 04:41:36 +00:00
befd6aa7ff
fixed stderr output (croaking..) as per new ASCII table style
2015-08-18 04:33:45 +00:00
419a612d0e
updated to new ASCII table style
2015-08-18 04:32:19 +00:00
ac7f443595
adopted new ASCIItable API
2015-08-13 21:25:08 +00:00
7ca1e77495
bug fixing
2015-08-13 08:32:09 +00:00
f982f42839
convert TSL/EDAX ang file format to proper ASCIItable.
2015-08-12 22:14:19 +00:00
1976cf44c1
fixed os.path.splitext bug when using STDIN input
2015-08-12 21:56:37 +00:00
3e65c324de
adopted changes in ASCIItable API
2015-08-12 21:52:33 +00:00
dfbd2fd013
fixed bug for STDIN processing
2015-08-12 21:28:07 +00:00
1149053c61
updated to new ASCII table style
2015-08-12 20:59:10 +00:00
9ee49b2c3b
adopted recent changes to API in ASCIItable.
...
removed Voronoi method from core module.
fixed buggy Laguerre tessellation (wrong seed scaling, wrong x,y,z order)
2015-08-12 20:55:53 +00:00
8217fdb115
adopted recent changes to API in ASCIItable.
2015-08-12 18:56:40 +00:00
31a6ac328d
adjusted to new ASCII table style and bugfix
2015-08-12 18:53:39 +00:00
cd70ec5a38
adopted recent changes to API in ASCIItable.
2015-08-12 18:43:11 +00:00
cd9a802a2b
adoption of recent API change in ASCIItable.
2015-08-12 18:09:40 +00:00
5dad5df588
adoption of recent API change in ASCIItable.
2015-08-12 17:47:38 +00:00
3097c87bea
adoption of recent API change in ASCIItable.
2015-08-12 17:43:49 +00:00
35863e0229
fixed averageDown and made it's test running
2015-08-12 13:43:05 +00:00
bceeb0964c
corrected calculation of expected file size for legacy files beyond the 4 GB limit
2015-08-10 18:48:48 +00:00
126cea24ce
fixed syntax and undefined variable calling errors
2015-08-09 22:12:49 +00:00
57dfa6a87e
added fall-back to non-multithreading execution when using only single CPU.
2015-08-08 21:43:21 +00:00
31f6d22d89
added option (force) to override selective seeding check.
2015-08-08 20:20:53 +00:00
889a5807bb
more conservative (and probably appropriate) variance default for Laguerre tessellations: 1.0 —> 0.1
2015-08-08 20:12:26 +00:00
bbeb210708
functionality now provided by more general “geom_fromImage”
2015-08-07 22:16:40 +00:00
9729c03c00
removed obsolete code. added croak about number of cpus used.
2015-08-07 22:15:24 +00:00
a4772343b0
adopted new ASCIItable API. some polishing.
2015-08-07 22:08:54 +00:00
4ed56a8ba6
removed debugging print statements
2015-08-07 20:52:57 +00:00
d4e748b654
outsourced multiple repetitive functions into ASCIItable class.
...
changed ASCIItable API from file-handles to filenames.
adopted these changes in pre and post processing scripts.
unified behavior and look.
fixed bugs here and there.
improved functionality.
2015-08-07 19:03:26 +00:00
de90a04374
assign indices from microstructure column if present for laguerre tessellation
2015-07-30 04:42:00 +00:00
599bb768ef
index microstructure from 1 instead of zero for laguerre tessellation
2015-07-28 22:15:32 +00:00
020a3e2634
superfluous since same can be (even more flexibly) accomplished with:
...
reLabel -l old -s old+tag
2015-07-26 00:41:42 +00:00
0db33f21b5
superfluous since same can be accomplished with:
...
showTable -l -d (labels and data)
2015-07-26 00:39:32 +00:00
b69a422529
Generate the geometry description of a directional non-equiaxed grain structure, e.g., RVE cutted from a cold-rolling sheet. '--reduct' specifies the thickness reduction after rolling, and '-n' specified the number of samples cutted, e.g., n=5, then five samples will be cutted from the sheet along theta = 0 (the rolling direction), theta = 22.5, theta = 45, theta = 67.5, and theta = 90 (the transversal direction).
2015-07-24 14:12:10 +00:00
657ed7ed35
group voxels/pts by orientation and position, require spicy.
2015-07-24 13:30:33 +00:00
fc0e29c45b
removed erroneous rescaling of Laguerre weights.
2015-07-22 22:34:40 +00:00
b15f68905f
fig a bug.
2015-07-21 15:38:12 +00:00
331a4c5775
add the number of the re-constructed orientation into the name of output files.
2015-07-18 17:25:05 +00:00
e08b7bd02e
forgot to rescale transparency mask by pixelsizes.
2015-07-16 22:34:26 +00:00
3c9d6df889
fixed typo in last commit
2015-07-15 18:15:39 +00:00
6ebc490207
fixed broken functionality by adopting new ASCIItable class output for data_readArray().
2015-07-15 16:57:03 +00:00
d676fdc1ce
fixed default behavior of symmetry. used to advertise having cubic symmetry but was using [].
2015-07-10 16:58:30 +00:00
dce0501358
script to rename labels in an ASCIItable
2015-07-10 16:28:01 +00:00
f8658ffea1
added “gap” value to render pieces of resulting image transparent.
2015-07-07 14:53:55 +00:00
812d17f91c
streamlined column processing based on recently introduced asciitable functionality.
2015-07-01 15:48:34 +00:00
ef243d3e19
added references
2015-06-30 14:52:48 +00:00
61e3987bfa
extract the deformation anisotropic coefficients (r values) and strength anisotropic coefficients (normalized yield stress) automatically.
2015-06-29 15:57:31 +00:00
47249bb52a
added possibility to scale deformation fluctuation field.
2015-06-29 09:44:49 +00:00
fcdd80bba3
switched order of command line options to make consequence of “degrees” switch more clear, i.e., it affects both the tolerance and Euler angles…
2015-06-29 09:40:44 +00:00
129026662c
fixed small bugs.
...
modernized file treatment.
improved Laguerre speed by a factor of 2 due to precalculating the squared weights.
2015-06-27 08:41:08 +00:00
088299daf2
fix the bug in the calculation of RMSD, replace N with sqrt(N).
2015-06-25 12:41:26 +00:00
e310763c52
Novel script to generate geometry description and material configuration from position, phase, and orientation data in an ASCIItable.
...
Can deal with phase-specific lattice symmetry, condenses orientations within a given angular threshold, and might be used in lieu of geom_fromANG when replacing the ANG header.
2015-06-21 11:56:05 +00:00
9b1f16e99e
report data range.
...
gracefully deal with constant field (below 1e-8 noise).
2015-06-19 11:36:21 +00:00
acad1246f3
fixed wrong variable name for quaternions as rotation options
2015-06-19 04:38:00 +00:00
94423cc7ac
added scriptID line “ removed during last commit”
2015-06-17 19:47:50 +00:00
012c830eff
removed writing of debugging statement to final output
2015-06-17 19:44:01 +00:00
e440305532
streamlined ASCIItable error checking.
2015-06-17 06:52:43 +00:00
5cc7b60a88
simplified processing of ASCIItables by utilizing the improved class methods.
...
modernized file looping.
2015-06-16 17:21:24 +00:00
d57c7568dd
simplified processing of ASCIItables by utilizing the improved class methods.
...
modernized file looping.
updated help.
2015-06-16 05:42:11 +00:00
c089ff9256
now with $ID$ and correct line endings…
2015-06-15 18:13:06 +00:00
6086baba52
Generate PNG image from scalar data on grid deformed by (periodic) deformation gradient.
2015-06-15 18:12:38 +00:00
a5b3e9d64c
typos fixed
2015-06-14 05:51:53 +00:00
37792f67df
automatically figure dimension of labels to tag.
2015-06-13 11:55:20 +00:00
c7f59c6482
change angle into radian.
2015-06-11 17:57:23 +00:00
bfe76794af
add the output of ".ang" file
2015-06-11 16:50:29 +00:00
c45a0ce55e
improved stability for geom_fromAng. no longer depends on correct header information.
...
geom_fromVPSC with correct size determination now
2015-06-11 10:06:53 +00:00
e243632eb5
simplifications by adopting functionality provided by new asciitable class methods.
2015-06-08 05:07:14 +00:00
d99e34d870
typo caused problems with more than one tensor
2015-06-06 15:42:29 +00:00
129446e687
simplified script. deals now only with single format at a time. result is printed to STDOUT unless “basename” option specified.
2015-06-06 11:12:07 +00:00
b7f98c00d6
input file handling now save for large file count.
...
streamlining of input column detection.
fixed bug iterating through “grainIDs” instead of “grain”.
proper closing and dismissal of output table file.
2015-06-05 11:50:15 +00:00
bb9e080790
input file handling now save for large file count.
...
reshape input rotation matrix to (3,3).
2015-06-05 11:47:27 +00:00
5adbe74b10
changed library function name table.labels_index() to table.label_index()
2015-06-05 11:44:17 +00:00
f50927b99f
Create seeds file by poking at 45 degree through given geom file.
...
Mimics APS Beamline 34-ID-E DAXM poking.
2015-06-05 11:41:44 +00:00
6eb83530b8
streamlining
2015-06-05 11:34:41 +00:00
2877066a6c
removed debug statement and simplified
2015-06-04 08:51:10 +00:00
bb677a26aa
added interface for predefined colormaps
2015-05-29 18:50:54 +00:00
92654dc2cd
fixed syntax bug, instantiating of Color object, and file closure.
2015-05-29 18:36:09 +00:00
54746c85d3
fixed bug for only blacklisting.
2015-05-28 22:31:32 +00:00
147cc91496
some polishing to laguerre tessellation
2015-05-28 20:57:03 +00:00
c327735c0d
order of whitelist is maintained in output (only if no blacklist is specified). allows to rearrange column order in tables.
2015-05-27 23:02:11 +00:00
c5349ab041
some polishing for option parser
2015-05-26 20:22:11 +00:00
73c6bd767f
added options for selective seed picking based on Mitchell’s best candidate algorithm for more uniformly distributed (spatially) seeds points
2015-05-26 20:13:35 +00:00
4107d5d1d2
Script to calculate Quaternion from input orientation matrix
2015-05-26 06:38:48 +00:00
5900fa4bf5
corrected defaults and simplified loops
2015-05-25 10:49:20 +00:00
1f160dfd72
FFT was at single precision only
2015-05-24 16:35:37 +00:00
e8fb49edc6
missing bracket
2015-05-22 06:17:35 +00:00
737e474cea
consistent handling of random number per file and always reporting as comment, fix for permuteData needed because of new asciitable behavior
2015-05-22 05:56:49 +00:00
fbfa55e910
adjusted to new table style and naming of output
2015-05-22 04:57:05 +00:00
f363d81de5
simplified column parsing
2015-05-21 21:54:47 +00:00
2349e6c79c
standard way of reporting
2015-05-21 16:04:19 +00:00
7af176d13f
introduced option to set microstructure starting index
2015-05-21 10:04:52 +00:00
14b921f6d5
corrected help text.
2015-05-21 00:13:50 +00:00
df5dd98576
simplified boolean dictionaries to “if else” constructs.
2015-05-21 00:13:11 +00:00
acc2cb656b
simplifications due to better functionality available through asciitable.py
...
output filename format has slightly changed: binned-X-Y_weighted-W_
2015-05-21 00:08:32 +00:00
439d778cc0
simplified column check.
...
fixed typos and improved help.
2015-05-20 23:21:35 +00:00
d70b903d1b
output follows standard way, test need to ignore header
2015-05-20 21:26:49 +00:00
056ba0f2e4
reverted back to hard-to-read but working if else statement
2015-05-20 19:40:11 +00:00
d99f13a49f
now operating on file, only on stdout if input comes from stdin
2015-05-20 19:07:52 +00:00
973f092fd9
similar to imageData but uses RGB triplet as color value instead of mapping a scalar.
...
Can only use columnar data and not 2D arrays, though.
2015-05-19 21:15:15 +00:00
ee65b269ad
simplified data column determination.
2015-05-19 21:14:19 +00:00
f7faa3eeca
finally fixed the bug in the transformation and incorporated rotation to conform to TSL convention
2015-05-18 22:28:24 +00:00
cd94469ea0
VPSC file format not used, if needed convert first to geom
2015-05-18 18:59:41 +00:00
76d456ee49
fixed rename
2015-05-18 14:48:25 +00:00
7775b254bd
updated tests to follow new addStrainTensors syntax, check in seeds_fromTable.py was wrong with simplified default
2015-05-18 08:42:14 +00:00
cddbd53789
reads better
2015-05-16 14:32:32 +00:00
03fef5fd6e
simplified option parsing
2015-05-15 13:49:16 +00:00
e45dcb7948
more readable if-else oneliner
2015-05-15 13:38:27 +00:00
6a38b4396f
simplified help
2015-05-15 13:34:52 +00:00
a3bed5cc42
short options conflicting with typical use
2015-05-15 10:33:32 +00:00
a451a69c2c
corrected default type (only list for 'extend')
2015-05-14 18:48:15 +00:00
fa1368204d
fixed bug in asciitable when updating labels for readArray, fixed checking for euler angels presence in tessellation, improved help
2015-05-14 17:07:50 +00:00
7ea350b90e
corrected default for multiple arguments of fixed length (tuple, not list)
2015-05-14 10:00:56 +00:00
3e8f16c515
range parameter is now autoscaled to account for -log option, i.e. range is always given as bounds of original data
2015-05-13 13:45:26 +00:00
b0a37497a1
fixed buggy coordinate transform.
2015-05-12 15:30:00 +00:00
6a98c7efad
simplified option parsing
2015-05-11 20:12:31 +00:00
4899b3df0a
found some unused (forgotten debug) statements
2015-05-11 20:09:49 +00:00
2102fadfc7
improved help for automatic documentation
2015-05-11 19:47:52 +00:00
537c42d146
script to transform coordinate system at APS beam line 34-ID-E from X,Y,Z,F to strain x,y,z
2015-05-11 14:15:50 +00:00
eff71b418b
now working with corrected asciitable
2015-05-10 20:59:23 +00:00
6f112b46b5
can be done with TSL OIM in current versions
2015-05-10 15:56:59 +00:00
b60f868a76
renumbering asciitable when readArray for selected columns only
...
test no longer for deleteColumn
2015-05-10 11:29:11 +00:00
8bf7a7ef6a
some beautifications
2015-05-10 10:58:32 +00:00
c0a9141c8f
updated help to enable automated documentation
2015-05-10 10:56:02 +00:00
a03b1ede99
improved help for automatic documentation
2015-05-10 08:59:21 +00:00
d87b70fe49
filterTable can do the job
2015-05-09 21:33:17 +00:00
18831e0e80
improved help for automatic documentation and simplified some scripts
2015-05-09 21:32:23 +00:00
47b8605733
improved help for automatic documentation and simplified some scripts
2015-05-09 13:01:31 +00:00
59e546e3d7
improved help for automatic documentation and simplified some scripts
2015-05-09 12:45:30 +00:00
d0180540eb
fixed bugs introduced with last commit and restored capability of handling legacy seeds format
2015-05-08 05:02:44 +00:00
cb42fb9c5d
clarified help text.
2015-05-05 16:58:56 +00:00
f5ccc37125
re-write Karafillis-Boyce yield criterion, the old version is actually the generalized Karafillis-Boyce yield criterion, i.e., Born-Besson yield criterion, which has three exponents, it seems unstable. Now retreat to the original Karafillis-Boyce yield criterion (Karafillis, Boyce 1993), which has only one exponents.
2015-05-04 15:00:02 +00:00
1e6c4fa988
re-write Yld2000
2015-05-04 14:54:48 +00:00
e0e7bb7a24
fix bugs of barlat1989, barlat1991
2015-05-04 14:52:33 +00:00
ce0675f359
added options for laguerrre tessellation
2015-05-02 07:41:14 +00:00
58b3d017bd
changed option name from “invertColor” to “invert”
2015-05-01 17:58:10 +00:00
afe7225357
add the option of exporting '.ctf' format file.
2015-04-28 18:09:07 +00:00
c05df20370
throw error message when DAMASK output obviously not present in T16 file
2015-04-28 17:54:00 +00:00
f8e06b488a
make the script consistent with other scripts:
...
1. use new file handles
2. add scriptID and version
2015-04-28 17:47:06 +00:00
906c3f63a1
updated hybridIA sampling to work with new format
...
cropLinearODF is not working for the new format, but filterTable should be able to do the task
2015-04-27 05:30:29 +00:00
1b9595d012
1. add the option 'all', fit all criteria automatically
...
2. generate equivalent stress automatically for advanced criteria.
2015-04-25 17:08:38 +00:00
a55b0c54c6
change the unit of stress
2015-04-25 16:22:32 +00:00
edb559d2fa
1. Judge the validity of stress points, and skip the invalid stress points.
...
2. change the defaulted unit
2015-04-25 16:19:06 +00:00
895421e677
changed from core module fftw to fftwpack from latex, tolerances need to be less strict
2015-04-24 08:07:13 +00:00
b9c5edf7ab
changed to standard file and output handling
2015-04-22 18:57:44 +00:00
2e6bbe887e
changed header in seeds file from 'x,y,z' to '1..3_coords'.
...
scripts now use the header information and do not rely on coordinates being in the first three columns
2015-04-22 18:44:54 +00:00
0cec85ac63
corrected order of output, config file output is not supported yet
2015-04-21 19:37:03 +00:00
46c33b0d98
polishing
2015-04-21 18:55:10 +00:00
4581e22a0f
change reading in to standard loop over files
...
getting bins now from header information
format of linearODF now standard ASCII table style with header/keyword/label
2015-04-20 14:22:45 +00:00
f43afa13d8
simple script to generate geom file from stacked tiff images.
2015-04-20 12:57:45 +00:00
f5762209dc
changed 'range' keyword to 'limit', now using proper ASCII table (with column 'intensity') for linearODF
...
hybridIO_linODFsampling simplified
2015-04-15 14:37:46 +00:00
64764b0902
introduced moving of multiple seeds at the same time
...
introduced more suitable check for convergence of the first bin. Improvements in bringing seeds with a size outside the range of the target closer are no longer invisible
2015-04-14 12:42:35 +00:00
790aa32b1b
fixed string to character splitting of weight column label
2015-04-13 20:24:03 +00:00
4bcc80911e
changed grid to float from (wrong) integer type.
...
row and column probability density normalization now takes place BEFORE limiting data range.
2015-04-13 19:55:28 +00:00
d008b566b4
ensure to bring all seeds within target range
2015-04-10 20:47:20 +00:00
9d3cd8f997
added options do define number of maximum seeds to move simulateneously
2015-04-10 18:08:17 +00:00
4aa63e1ab9
handling of seeds files without microstructure (but eulerangles)
2015-04-10 16:59:08 +00:00
09bfd1e18e
more verbose error handling for euler angles limits
...
ensuring that ROUNDED euler angles are not above the limits
2015-04-10 14:50:23 +00:00
e01e270300
improved search for double microstructures (was N^2 bogosort) in geom_fromAng and introduced it in geom_fromVPSC
2015-04-10 12:57:25 +00:00
5257a2161f
added options for x and y normalization
2015-04-09 06:45:21 +00:00
57a2c90d30
corrected according to vtk specification and remove an unused option
2015-04-08 18:48:35 +00:00
976647b9e4
add the convergence criterion, the method is :
...
1. calculate the L2 norm of the residual of all the stress points
2. store the relative errors of the L2 norm
3. if the standard deviation of the relative errors of last five fittings is less than 0.05, that it is considered that the relative errors is stabilized, so the fitting is finished.
2015-04-08 17:48:26 +00:00
b77768fd4d
all the criteria support plane stress
2015-04-08 16:24:20 +00:00
0544706c7b
corrected help for legacy format
2015-04-08 12:51:40 +00:00
6e650a42b4
some comments for discussion
2015-04-07 07:42:46 +00:00
ab89c84ec8
Correct the message of last change
...
1. rename BBC2003 as BBC2000;
2. add the real BBC2003 yield criterion, BBC2003 works;
3. now the BBC family yield criteria include: BBC2000, BBC2003, BBC2005
2015-04-03 21:01:37 +00:00
412028f33f
1. rename BBC2003 as BBC2000;
...
2. add the real BBC2003 yield criterion, BBC2003 works;
3. now the BBC family yield criteria include: BBC2000, BBC2003, BBC2008
2015-04-03 20:59:23 +00:00
cd2a744db9
add Yld2000 yield criterion, Yld2000 works
2015-04-03 16:20:03 +00:00
2b9964bba5
add Barlat-Lian 1989 yield criterion, Barlat1989 works.
2015-04-03 12:31:13 +00:00
0097d39873
fix some type errors; add more comments
2015-04-02 19:32:48 +00:00
86f39de462
remove non-utf symbol
2015-04-02 16:13:00 +00:00
d8a99b23bf
1.compact all the criteria into a single Class;
...
2.the first thorough check of the script;
3.add the option of exponents for all non-quadratic yield criteria, now the user 1)can specify the exponent, for example, m=6 for Barlat 1991, or 2)see the exponent as an undetermined parameters;
4.add the pre-specified bounds for all criteria;
5.add the user defined equivalent stress for some anisotropic yield criteria
2015-04-02 12:08:55 +00:00
92a67e1a9d
geom_fromAng.py crashed when found empty line (eg. at the end of the file), now fixed
2015-04-01 14:42:25 +00:00
a1956436be
fixed bug introduced last time when searching for keywords in spectralOut header
...
made reading in of header more robust by explicitly using the information given by fortran specifies the data length
introduced a legacy mode again, now it is used to read old spectralOut files prior to rev 4017
2015-04-01 10:02:21 +00:00
38943c1e94
improved help
2015-03-29 15:37:40 +00:00
913c5347a5
removed handling for old legacy format (we might introduce a new one)
2015-03-29 09:08:42 +00:00
66d4ff097f
removed obsolete comment
2015-03-28 11:44:17 +00:00
72c2ead277
polishing, replace variables calculation with arrays calculation.
2015-03-27 17:58:49 +00:00
8a30021202
cleaned up core modul
2015-03-27 14:10:18 +00:00
Martin Diehl