]> https://gitweb.dealii.org/ - dealii.git/log
dealii.git
6 years agoFix comments in @code blocks in base headers 6896/head
Daniel Arndt [Sat, 7 Jul 2018 21:04:59 +0000 (23:04 +0200)]
Fix comments in @code blocks in base headers

6 years agoMerge pull request #6864 from marcfehling/callback-utilities
Wolfgang Bangerth [Sat, 7 Jul 2018 03:12:13 +0000 (21:12 -0600)]
Merge pull request #6864 from marcfehling/callback-utilities

Refactored data transfer across distributed meshes.

6 years agoMerge pull request #6893 from masterleinad/fix_grid_headers
Daniel Arndt [Fri, 6 Jul 2018 22:39:05 +0000 (00:39 +0200)]
Merge pull request #6893 from masterleinad/fix_grid_headers

Fix comments in @code blocks in grid headers

6 years agoRefactored parallel::distributed::Triangulation w.r.t. the new p4est transfer API. 6864/head
Marc Fehling [Tue, 3 Jul 2018 21:02:53 +0000 (15:02 -0600)]
Refactored parallel::distributed::Triangulation w.r.t. the new p4est transfer API.

Include new p4est transfer API to wrapper functions.

Introduced class DataTransfer in private scope of Triangulation.

Let API use 'vector<char>' instead of 'void*' for buffers.

Dynamic determination of pack/unpack sizes.

6 years agoFix comments in @code blocks in grid headers 6893/head
Daniel Arndt [Fri, 6 Jul 2018 10:58:16 +0000 (12:58 +0200)]
Fix comments in @code blocks in grid headers

6 years agoMerge pull request #6818 from drwells/reflow-code-samples-1
Daniel Arndt [Fri, 6 Jul 2018 11:02:38 +0000 (13:02 +0200)]
Merge pull request #6818 from drwells/reflow-code-samples-1

Reflow some code samples.

6 years agoMerge pull request #6887 from masterleinad/fix_fe_headers
Daniel Arndt [Fri, 6 Jul 2018 08:44:00 +0000 (10:44 +0200)]
Merge pull request #6887 from masterleinad/fix_fe_headers

Fix comments in @code blocks in fe headers

6 years agoMerge pull request #6876 from bangerth/simplify
Daniel Arndt [Fri, 6 Jul 2018 08:43:36 +0000 (10:43 +0200)]
Merge pull request #6876 from bangerth/simplify

Simplify some code in DataOut_DoFData.

6 years agoMerge pull request #6858 from masterleinad/indent_example-step-39
Daniel Arndt [Fri, 6 Jul 2018 08:40:03 +0000 (10:40 +0200)]
Merge pull request #6858 from masterleinad/indent_example-step-39

examples/step-39: Update indenting and modernize

6 years agoSimplify some code in DataOut_DoFData. 6876/head
Wolfgang Bangerth [Tue, 3 Jul 2018 16:51:55 +0000 (10:51 -0600)]
Simplify some code in DataOut_DoFData.

6 years agoMerge pull request #6788 from schoeder/parallelvector_min_max_operation
Wolfgang Bangerth [Thu, 5 Jul 2018 22:34:40 +0000 (16:34 -0600)]
Merge pull request #6788 from schoeder/parallelvector_min_max_operation

Introduce min and max to VectorOperation

6 years agoExpand lambda body 6887/head
Daniel Arndt [Thu, 5 Jul 2018 14:00:16 +0000 (16:00 +0200)]
Expand lambda body

6 years agoFix comments in @code blocks in fe headers
Daniel Arndt [Thu, 5 Jul 2018 13:25:45 +0000 (15:25 +0200)]
Fix comments in @code blocks in fe headers

6 years agoReflow some code samples. 6818/head
David Wells [Thu, 21 Jun 2018 16:09:31 +0000 (12:09 -0400)]
Reflow some code samples.

The content of @code/@endcode blocks must be less than 80 characters per
line to prevent clang-format from rewrapping it in strange ways.

6 years agoMerge pull request #6888 from bangerth/fix-formula
Martin Kronbichler [Thu, 5 Jul 2018 20:08:02 +0000 (22:08 +0200)]
Merge pull request #6888 from bangerth/fix-formula

Fix a formula in a comment in step-14.

6 years agoMerge pull request #6819 from masterleinad/fix_numerics_headers
Wolfgang Bangerth [Thu, 5 Jul 2018 17:55:12 +0000 (11:55 -0600)]
Merge pull request #6819 from masterleinad/fix_numerics_headers

 Fix comments in @code blocks in numerics headers

6 years agoMerge pull request #6820 from masterleinad/fix_physics_headers
Wolfgang Bangerth [Thu, 5 Jul 2018 17:23:58 +0000 (11:23 -0600)]
Merge pull request #6820 from masterleinad/fix_physics_headers

Fix comments in @code blocks in physics headers

6 years agoFix a formula in a comment in step-14. 6888/head
Wolfgang Bangerth [Thu, 5 Jul 2018 13:35:40 +0000 (07:35 -0600)]
Fix a formula in a comment in step-14.

6 years agoMerge pull request #6889 from kronbichler/disable_tests_without_p4est
Martin Kronbichler [Thu, 5 Jul 2018 16:38:37 +0000 (18:38 +0200)]
Merge pull request #6889 from kronbichler/disable_tests_without_p4est

Restrict tests requiring p4est to the case when we actually have it

6 years agoMerge pull request #6807 from davydden/feature/component_is_part_of_tensor
Denis Davydov [Thu, 5 Jul 2018 14:43:37 +0000 (16:43 +0200)]
Merge pull request #6807 from davydden/feature/component_is_part_of_tensor

add component_is_part_of_tensor

6 years agoRestrict some tests requiring p4est to the case when we actually have it. 6889/head
Martin Kronbichler [Thu, 5 Jul 2018 14:41:44 +0000 (16:41 +0200)]
Restrict some tests requiring p4est to the case when we actually have it.

6 years agoMerge pull request #6869 from masterleinad/indent_example-step-14
Wolfgang Bangerth [Thu, 5 Jul 2018 13:31:45 +0000 (07:31 -0600)]
Merge pull request #6869 from masterleinad/indent_example-step-14

examples/step-14: Update indenting and modernize

6 years agoMerge pull request #6870 from masterleinad/indent_example-step-27
Wolfgang Bangerth [Thu, 5 Jul 2018 13:28:46 +0000 (07:28 -0600)]
Merge pull request #6870 from masterleinad/indent_example-step-27

examples/step-27: Update indenting and modernize

6 years agoMerge pull request #6871 from masterleinad/fix_kdtree_docu
Wolfgang Bangerth [Thu, 5 Jul 2018 13:27:18 +0000 (07:27 -0600)]
Merge pull request #6871 from masterleinad/fix_kdtree_docu

Fix kdtree documentation and reflow comments manually

6 years agoAddress my own review comments. 6858/head
Wolfgang Bangerth [Thu, 5 Jul 2018 13:24:44 +0000 (07:24 -0600)]
Address my own review comments.

6 years agoadd component_is_part_of_tensor and its support to vtu 6807/head
Denis Davydov [Thu, 21 Jun 2018 10:41:16 +0000 (12:41 +0200)]
add component_is_part_of_tensor and its support to vtu

6 years agoMerge pull request #6874 from bangerth/doc-update
Matthias Maier [Wed, 4 Jul 2018 15:49:30 +0000 (10:49 -0500)]
Merge pull request #6874 from bangerth/doc-update

Update the documentation of the Rannacher Turek element.

6 years agoMerge pull request #6884 from kronbichler/line_break_changelog
Matthias Maier [Wed, 4 Jul 2018 15:48:49 +0000 (10:48 -0500)]
Merge pull request #6884 from kronbichler/line_break_changelog

Make sure to add a line break in the changelogs

6 years agoMerge pull request #6883 from masterleinad/fix_dofs_headers
Matthias Maier [Wed, 4 Jul 2018 15:48:23 +0000 (10:48 -0500)]
Merge pull request #6883 from masterleinad/fix_dofs_headers

Fix comments in @code blocks in dofs headers

6 years agoMerge pull request #6882 from masterleinad/fix_distrributed_headers
Matthias Maier [Wed, 4 Jul 2018 15:47:50 +0000 (10:47 -0500)]
Merge pull request #6882 from masterleinad/fix_distrributed_headers

Fix comments in @code blocks in distributed headers

6 years agoMerge pull request #6793 from drwells/require-tbb-4.2.0-or-newer
Matthias Maier [Wed, 4 Jul 2018 15:47:08 +0000 (10:47 -0500)]
Merge pull request #6793 from drwells/require-tbb-4.2.0-or-newer

Require TBB 4.2.0 or newer.

6 years agoMake sure to add a line break in the changelogs. 6884/head
Martin Kronbichler [Wed, 4 Jul 2018 13:44:08 +0000 (15:44 +0200)]
Make sure to add a line break in the changelogs.

6 years agoFix comments in @code blocks in dofs headers 6883/head
Daniel Arndt [Wed, 4 Jul 2018 13:17:30 +0000 (15:17 +0200)]
Fix comments in @code blocks in dofs headers

6 years agoRequire TBB 4.2.0 or newer. 6793/head
David Wells [Tue, 19 Jun 2018 18:02:18 +0000 (14:02 -0400)]
Require TBB 4.2.0 or newer.

TBB 4.1 is not compatible with newer versions of GCC due to some missing
std::atomic::load calls, so lets blacklist all older versions.

6 years agoMerge pull request #6879 from marcfehling/p4est-2.0
Daniel Arndt [Wed, 4 Jul 2018 11:26:34 +0000 (13:26 +0200)]
Merge pull request #6879 from marcfehling/p4est-2.0

 Increase minimum version of p4est to 2.0.

6 years agoFix comments in @code blocks in distributed headers 6882/head
Daniel Arndt [Wed, 4 Jul 2018 10:26:36 +0000 (12:26 +0200)]
Fix comments in @code blocks in distributed headers

6 years agoMerge pull request #6881 from marcfehling/attach_data_01_fix
Wolfgang Bangerth [Wed, 4 Jul 2018 03:42:06 +0000 (21:42 -0600)]
Merge pull request #6881 from marcfehling/attach_data_01_fix

Let 'attach_data_01' consider case with more procs than cells.

6 years agoMerge pull request #6878 from masterleinad/restrict_wclass-memaccess
Wolfgang Bangerth [Wed, 4 Jul 2018 02:41:29 +0000 (20:41 -0600)]
Merge pull request #6878 from masterleinad/restrict_wclass-memaccess

Disable -Wclass-memaccess for non-CXX17 builds and in bundled boost

6 years agoLet 'attach_data_01' consider case with more procs than cells. 6881/head
Marc Fehling [Wed, 4 Jul 2018 00:06:19 +0000 (18:06 -0600)]
Let 'attach_data_01' consider case with more procs than cells.

6 years agoFix comments in @code blocks in physics headers 6820/head
Daniel Arndt [Thu, 21 Jun 2018 20:41:25 +0000 (22:41 +0200)]
Fix comments in @code blocks in physics headers

6 years agoFix up error text 6819/head
Daniel Arndt [Fri, 22 Jun 2018 17:11:24 +0000 (19:11 +0200)]
Fix up error text

6 years agoFix comments in @code blocks in numerics headers
Daniel Arndt [Thu, 21 Jun 2018 20:31:35 +0000 (22:31 +0200)]
Fix comments in @code blocks in numerics headers

6 years agoDisable -Wclass-memaccess for non-CXX17 builds and in bundled boost 6878/head
Daniel Arndt [Tue, 3 Jul 2018 21:36:35 +0000 (23:36 +0200)]
Disable -Wclass-memaccess for non-CXX17 builds and in bundled boost

6 years agoDrop backward compatibilities to older versions of p4est than 2.0. 6879/head
Marc Fehling [Tue, 3 Jul 2018 21:22:28 +0000 (15:22 -0600)]
Drop backward compatibilities to older versions of p4est than 2.0.

6 years agoIncrease minimum version of p4est to 2.0.
Marc Fehling [Tue, 3 Jul 2018 20:50:03 +0000 (14:50 -0600)]
Increase minimum version of p4est to 2.0.

6 years agoUpdate the documentation of the Rannacher Turek element. 6874/head
Wolfgang Bangerth [Tue, 3 Jul 2018 15:59:37 +0000 (09:59 -0600)]
Update the documentation of the Rannacher Turek element.

6 years agoMerge pull request #6817 from masterleinad/indent_example-step-22
Wolfgang Bangerth [Mon, 2 Jul 2018 19:06:34 +0000 (13:06 -0600)]
Merge pull request #6817 from masterleinad/indent_example-step-22

examples/step-22: Update indenting and modernize

6 years agoImprove comments for the (bi-)linear forms 6817/head
Daniel Arndt [Mon, 2 Jul 2018 14:25:23 +0000 (16:25 +0200)]
Improve comments for the (bi-)linear forms

6 years agoProvide a more verbose name for a variable 6870/head
Daniel Arndt [Mon, 2 Jul 2018 12:20:42 +0000 (14:20 +0200)]
Provide a more verbose name for a variable

6 years agoFix kdtree documentation and reflow comments manually 6871/head
Daniel Arndt [Sun, 1 Jul 2018 23:44:33 +0000 (01:44 +0200)]
Fix kdtree documentation and reflow comments manually

6 years agoexamples/step-14: Update indenting and modernize 6869/head
Daniel Arndt [Sun, 1 Jul 2018 20:18:33 +0000 (22:18 +0200)]
examples/step-14: Update indenting and modernize

6 years agoexamples/step-27: Update indenting and modernize
Daniel Arndt [Sun, 1 Jul 2018 21:49:09 +0000 (23:49 +0200)]
examples/step-27: Update indenting and modernize

6 years agoMerge pull request #6849 from masterleinad/indent_example-step-16
Denis Davydov [Sat, 30 Jun 2018 05:11:24 +0000 (07:11 +0200)]
Merge pull request #6849 from masterleinad/indent_example-step-16

example/step-16: Update indenting and modernize

6 years agoMerge pull request #6865 from drwells/fix-exception-classification
Denis Davydov [Sat, 30 Jun 2018 05:09:14 +0000 (07:09 +0200)]
Merge pull request #6865 from drwells/fix-exception-classification

Fix an exception description.

6 years agoMerge pull request #6862 from masterleinad/indent_example-step-13
Denis Davydov [Sat, 30 Jun 2018 05:06:53 +0000 (07:06 +0200)]
Merge pull request #6862 from masterleinad/indent_example-step-13

examples/step-13: Update indenting and modernize

6 years agoMerge pull request #6866 from drwells/reformat-bibtex-code
Denis Davydov [Sat, 30 Jun 2018 05:03:48 +0000 (07:03 +0200)]
Merge pull request #6866 from drwells/reformat-bibtex-code

Reformat bibtex code

6 years agoFix a broken URL. 6866/head
David Wells [Sat, 30 Jun 2018 04:41:03 +0000 (00:41 -0400)]
Fix a broken URL.

6 years agoReindent the bibtex entries.
David Wells [Sat, 30 Jun 2018 04:11:52 +0000 (00:11 -0400)]
Reindent the bibtex entries.

Since some lines were longer than 80 characters clang-format made a mess
here. Clean it up by splitting lines manually around fields.

6 years agoFix an exception description. 6865/head
David Wells [Sat, 30 Jun 2018 03:52:55 +0000 (23:52 -0400)]
Fix an exception description.

The implementation throws an exception at run time (with Assert).

6 years agoRemove unused variable in dox file 6862/head
Daniel Arndt [Fri, 29 Jun 2018 19:58:02 +0000 (21:58 +0200)]
Remove unused variable in dox file

6 years agoexamples/step-13: Update indenting and modernize
Daniel Arndt [Fri, 29 Jun 2018 19:10:51 +0000 (21:10 +0200)]
examples/step-13: Update indenting and modernize

6 years agoMerge pull request #6859 from drwells/update-step-10-3
Daniel Arndt [Fri, 29 Jun 2018 17:47:11 +0000 (19:47 +0200)]
Merge pull request #6859 from drwells/update-step-10-3

Use a range-for in step-10.

6 years agoMerge pull request #6860 from drwells/update-step-11
Daniel Arndt [Fri, 29 Jun 2018 17:46:25 +0000 (19:46 +0200)]
Merge pull request #6860 from drwells/update-step-11

Update step 11

6 years agoMerge pull request #6839 from drwells/step-40-modernization
Daniel Arndt [Fri, 29 Jun 2018 15:41:32 +0000 (17:41 +0200)]
Merge pull request #6839 from drwells/step-40-modernization

Update step-40.

6 years agoexample/step-16: Update indenting and modernize 6849/head
Daniel Arndt [Tue, 26 Jun 2018 14:40:46 +0000 (16:40 +0200)]
example/step-16: Update indenting and modernize

6 years agoUse a range-for in step-10. 6859/head
David Wells [Fri, 29 Jun 2018 13:04:11 +0000 (09:04 -0400)]
Use a range-for in step-10.

This finishes the modernization started in commits 0ef6e96485b and 332a199f3f9.

6 years agoCreate a svg instead
Daniel Arndt [Fri, 29 Jun 2018 14:27:08 +0000 (16:27 +0200)]
Create a svg instead

6 years agoDelete some trailing whitespace. 6860/head
David Wells [Fri, 29 Jun 2018 13:17:41 +0000 (09:17 -0400)]
Delete some trailing whitespace.

6 years agoUpdate step-11 to use AffineConstraints.
David Wells [Fri, 29 Jun 2018 13:17:29 +0000 (09:17 -0400)]
Update step-11 to use AffineConstraints.

6 years agoexamples/step-39: Update indenting and modernize
Daniel Arndt [Fri, 29 Jun 2018 12:28:54 +0000 (14:28 +0200)]
examples/step-39: Update indenting and modernize

6 years agoaddressed all raised points 6788/head
Svenja Schoeder [Wed, 27 Jun 2018 11:00:33 +0000 (13:00 +0200)]
addressed all raised points

fixed exception message

typo

typo

fixed typos

changes due to indent

6 years agoimproved the description for the handling of initialized ghost elements
Svenja Schoeder [Wed, 20 Jun 2018 13:26:08 +0000 (15:26 +0200)]
improved the description for the handling of initialized ghost elements

extended test to show the behavior in the presence of initialized and set ghost elements

added test for ReadWriteVector

discussed the case that compress is called with VectorOperation::max two times and added test coverage of this case

indention

6 years agoIntroduce min and max to VectorOperation for parallel vectors
Svenja Schoeder [Mon, 18 Jun 2018 14:24:22 +0000 (16:24 +0200)]
Introduce min and max to VectorOperation for parallel vectors

Add tests for min max VectorOperation

add changelog

disallow complex numbers for VectorOperation::min and VectorOperation::max

testing of VectorOperation::max if several processors have same ghost element but with different values

fixed typo on cases

6 years agoMerge pull request #6857 from masterleinad/explicit_identity_matrix_constructor
Daniel Arndt [Fri, 29 Jun 2018 07:34:17 +0000 (09:34 +0200)]
Merge pull request #6857 from masterleinad/explicit_identity_matrix_constructor

Make IdentityMatrix constructor explicit

6 years agoMake IdentityMatrix constructor explicit 6857/head
Daniel Arndt [Thu, 28 Jun 2018 14:08:03 +0000 (16:08 +0200)]
Make IdentityMatrix constructor explicit

6 years agoMerge pull request #6850 from masterleinad/use_using
David Wells [Thu, 28 Jun 2018 20:04:56 +0000 (16:04 -0400)]
Merge pull request #6850 from masterleinad/use_using

Replace typedef by using

6 years agoUpdate coding conventions 6850/head
Daniel Arndt [Thu, 28 Jun 2018 17:08:22 +0000 (19:08 +0200)]
Update coding conventions

6 years agoMerge pull request #6838 from masterleinad/indent_example-step-12
David Wells [Thu, 28 Jun 2018 16:09:23 +0000 (12:09 -0400)]
Merge pull request #6838 from masterleinad/indent_example-step-12

examples/step-12: Update indenting and modernize

6 years agoFix typo 6838/head
Daniel Arndt [Thu, 28 Jun 2018 15:03:34 +0000 (17:03 +0200)]
Fix typo

6 years agoMake IdentityMatrix constrcutor explicit
Daniel Arndt [Thu, 28 Jun 2018 14:08:03 +0000 (16:08 +0200)]
Make IdentityMatrix constrcutor explicit

6 years agoMerge pull request #6846 from masterleinad/fix_wrange_loop_analysis
David Wells [Thu, 28 Jun 2018 12:38:08 +0000 (08:38 -0400)]
Merge pull request #6846 from masterleinad/fix_wrange_loop_analysis

Fix more -Wrange-loop-analysis findings

6 years agoMerge pull request #6852 from bangerth/doc-update-99
David Wells [Thu, 28 Jun 2018 12:36:43 +0000 (08:36 -0400)]
Merge pull request #6852 from bangerth/doc-update-99

Clarify documentation of Patterns::Integer.

6 years agoPass IndexSet element by copy 6846/head
Daniel Arndt [Thu, 28 Jun 2018 08:05:21 +0000 (10:05 +0200)]
Pass IndexSet element by copy

6 years agoFix more -Wrange-loop-analysis findings
Daniel Arndt [Tue, 26 Jun 2018 00:34:38 +0000 (02:34 +0200)]
Fix more -Wrange-loop-analysis findings

6 years agoMerge pull request #6853 from bangerth/unsigned
Daniel Arndt [Thu, 28 Jun 2018 07:35:54 +0000 (09:35 +0200)]
Merge pull request #6853 from bangerth/unsigned

Pass an unsigned int by value, rather than reference.

6 years agoMerge pull request #6854 from bangerth/add-copyright
Daniel Arndt [Wed, 27 Jun 2018 23:25:58 +0000 (01:25 +0200)]
Merge pull request #6854 from bangerth/add-copyright

Add a missing copyright note.

6 years agoAdd a missing copyright note. 6854/head
Wolfgang Bangerth [Wed, 27 Jun 2018 23:09:12 +0000 (17:09 -0600)]
Add a missing copyright note.

6 years agoPass an unsigned int by value, rather than reference. 6853/head
Wolfgang Bangerth [Wed, 27 Jun 2018 23:08:02 +0000 (17:08 -0600)]
Pass an unsigned int by value, rather than reference.

6 years agoClarify documentation of Patterns::Integer. 6852/head
Wolfgang Bangerth [Wed, 27 Jun 2018 23:06:49 +0000 (17:06 -0600)]
Clarify documentation of Patterns::Integer.

6 years agoUse modernize-use-using check
Daniel Arndt [Wed, 27 Jun 2018 13:14:40 +0000 (15:14 +0200)]
Use modernize-use-using check

6 years agoReplace typedef by using in include
Daniel Arndt [Wed, 27 Jun 2018 13:13:01 +0000 (15:13 +0200)]
Replace typedef by using in include

6 years agoReplace typedef by using in source
Daniel Arndt [Wed, 27 Jun 2018 13:12:23 +0000 (15:12 +0200)]
Replace typedef by using in source

6 years agoReplace typedef by using in examples
Daniel Arndt [Wed, 27 Jun 2018 13:10:26 +0000 (15:10 +0200)]
Replace typedef by using in examples

6 years agoMerge pull request #6779 from tamiko/update-step-4
Martin Kronbichler [Tue, 26 Jun 2018 17:57:54 +0000 (19:57 +0200)]
Merge pull request #6779 from tamiko/update-step-4

examples/step-4: Update indenting

6 years agoMerge pull request #6845 from masterleinad/step-20-unused
Martin Kronbichler [Tue, 26 Jun 2018 17:57:09 +0000 (19:57 +0200)]
Merge pull request #6845 from masterleinad/step-20-unused

Avoid warning for an unused variable in step-20

6 years agoMerge pull request #6780 from tamiko/update-step-5
Daniel Arndt [Tue, 26 Jun 2018 12:34:49 +0000 (14:34 +0200)]
Merge pull request #6780 from tamiko/update-step-5

examples/step-5: Update indenting

6 years agoMerge pull request #6844 from masterleinad/return_iterator_const_ref
Daniel Arndt [Tue, 26 Jun 2018 12:17:58 +0000 (14:17 +0200)]
Merge pull request #6844 from masterleinad/return_iterator_const_ref

Return dereferenced IteratorOverIterators object by const reference

6 years agoImprove indentation
Daniel Arndt [Tue, 26 Jun 2018 12:16:17 +0000 (14:16 +0200)]
Improve indentation

6 years agoMerge pull request #6778 from tamiko/update-step-3
Daniel Arndt [Tue, 26 Jun 2018 09:24:28 +0000 (11:24 +0200)]
Merge pull request #6778 from tamiko/update-step-3

examples/step-3: Update indenting

6 years agoAvoid warning for an unused variable in step-20 6845/head
Daniel Arndt [Tue, 26 Jun 2018 00:28:23 +0000 (02:28 +0200)]
Avoid warning for an unused variable in step-20


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