Re: [GRASS-dev] [GRASS GIS] #3638: v.distance linear matrix remove duplicate cat column & table associated without having map of distance lines

[GRASS GIS]

#3638: v.distance linear matrix remove duplicate cat column & table associated
without having map of distance lines
--+-
  Reporter:  Maellevd |  Owner:  grass-dev@…
  Type:  defect   | Status:  reopened
  Priority:  normal   |  Milestone:  7.8.3
 Component:  Vector   |Version:  7.4.0
Resolution:   |   Keywords:  v.distance
   CPU:  Unspecified  |   Platform:  Linux
--+-

Comment (by mlennert):

 See https://github.com/OSGeo/grass/pull/601

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Re: [GRASS-dev] [GRASS GIS] #3638: v.distance linear matrix remove duplicate cat column & table associated without having map of distance lines

[GRASS GIS]

#3638: v.distance linear matrix remove duplicate cat column & table associated
without having map of distance lines
--+-
  Reporter:  Maellevd |  Owner:  grass-dev@…
  Type:  defect   | Status:  reopened
  Priority:  normal   |  Milestone:
 Component:  Vector   |Version:  7.4.0
Resolution:   |   Keywords:  v.distance
   CPU:  Unspecified  |   Platform:  Linux
--+-

Comment (by mlennert):

 Replying to [comment:3 mlennert]:
 >
 > See r73272 for the fix. I'll backport to the other branches ASAP.

 Done in r73273 and r73275.

 > I'll attach a patch with these enhancement (plus some attempt at
 cleaning up parser dependency instructions. This will partly change the
 module API, though, so we'll have to decide how to apply.

 Also done. This patch creates a new (-s) flag which allows to output a
 square matrix if desired. By default the module will output a linear
 matrix, whatever the number of upload variables.

 The patch also allows creating a table without creating a map and allows
 to determine column names in output, even when using -p or table=.

 Please test.

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Re: [GRASS-dev] [GRASS GIS] #3638: v.distance linear matrix remove duplicate cat column & table associated without having map of distance lines

[GRASS GIS]

#3638: v.distance linear matrix remove duplicate cat column & table associated
without having map of distance lines
--+-
  Reporter:  Maellevd |  Owner:  grass-dev@…
  Type:  defect   | Status:  reopened
  Priority:  normal   |  Milestone:
 Component:  Vector   |Version:  7.4.0
Resolution:   |   Keywords:  v.distance
   CPU:  Unspecified  |   Platform:  Linux
--+-
Changes (by mlennert):

 * Attachment "vdistance_matrix_table.diff" added.

 patch for several issues identified in this ticket

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Re: [GRASS-dev] [GRASS GIS] #3638: v.distance linear matrix remove duplicate cat column & table associated without having map of distance lines

[GRASS GIS]

#3638: v.distance linear matrix remove duplicate cat column & table associated
without having map of distance lines
--+-
  Reporter:  Maellevd |  Owner:  grass-dev@…
  Type:  defect   | Status:  reopened
  Priority:  normal   |  Milestone:
 Component:  Vector   |Version:  7.4.0
Resolution:   |   Keywords:  v.distance
   CPU:  Unspecified  |   Platform:  Linux
--+-

Comment (by sbl):

 For a more general request of writing table-like results directly to
 database see: #3639

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Re: [GRASS-dev] [GRASS GIS] #3638: v.distance linear matrix remove duplicate cat column & table associated without having map of distance lines

[GRASS GIS]

#3638: v.distance linear matrix remove duplicate cat column & table associated
without having map of distance lines
--+-
  Reporter:  Maellevd |  Owner:  grass-dev@…
  Type:  defect   | Status:  reopened
  Priority:  normal   |  Milestone:
 Component:  Vector   |Version:  7.4.0
Resolution:   |   Keywords:  v.distance
   CPU:  Unspecified  |   Platform:  Linux
--+-

Comment (by mlennert):

 Thanks for reopening the ticket as there are several elements that are
 real requests for enhancements or even bugs. However, I agree with sbl
 that the original bug post could be less in the form of questions and more
 in the form of a bug report / enhancement request. If you are not sure
 about how to use a module than ask a question on the list. If you are
 (pretty) sure that there is a problem with a module, post a ticket here
 with the description of the problem.

 The duplicate cat values come from the fact that when you use -a a to_cat
 is automatically uploaded (otherwise how would one be able to use the
 resulting matrix ?), so upload=cat is redundant. But if a linear output is
 wanted, a second variable is needed. Try to run with upload=dist,to_x,to_y
 and you will see that there is no duplication.

 === Bug ===

 * The fact that the creation of a table is only possible when the input
 maps are in the current mapset is a bug IMHO. It is due to the fact that
 in the code updating the table and creating a new table is treated as
 equal by calling Vect_set_db_updated(). Moving this to only the part
 where the existing table is updated solves this issue.

 See r73272 for the fix. I'll backport to the other branches ASAP.

 === Enhancements ===

 * Currently, when using the -ap flag combination with one single upload
 variable, the module automatically prints out a square matrix. However, in
 certain situations it might be very useful to be able to print out a
 linear matrix. This could handled by a flag, e.g. -s for square matrix,
 instead of automatically

 * I do not understand why an output map should be necessary to create an
 output table. It can be useful to have such a table without a map.

 * To add to this: when printing or creating a new table, one should be
 able to determine column names, not only for updating an existing table

 I'll attach a patch with these enhancement (plus some attempt at cleaning
 up parser dependency instructions. This will partly change the module API,
 though, so we'll have to decide how to apply.

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Re: [GRASS-dev] [GRASS GIS] #3638: v.distance linear matrix remove duplicate cat column & table associated without having map of distance lines

[GRASS GIS]

#3638: v.distance linear matrix remove duplicate cat column & table associated
without having map of distance lines
--+-
  Reporter:  Maellevd |  Owner:  grass-dev@…
  Type:  defect   | Status:  reopened
  Priority:  normal   |  Milestone:
 Component:  Vector   |Version:  7.4.0
Resolution:   |   Keywords:  v.distance
   CPU:  Unspecified  |   Platform:  Linux
--+-
Changes (by sbl):

 * status:  closed => reopened
 * resolution:  worksforme =>
 * type:  enhancement => defect


Comment:

 Sorry, I was a bit quick and see that
 {{{
 v.distance -p -a from=hospitals to= hospitals upload=cat,dist
 }}}
 indeed produce duplicate columns


 Also,
 {{{
 ERROR: Bug: attempt to update map which is not in current mapset
 }}}

 should not happen.
 In addition, the resulting map also lacks an attribute table (which it
 should have). In more detail, the attribute table is produced, but not
 connected to the vector map...

 Writing table-formated output from GRASS directy to the database is a
 different issue, and might be useful in more modules...

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Re: [GRASS-dev] [GRASS GIS] #3638: v.distance linear matrix remove duplicate cat column & table associated without having map of distance lines

[GRASS GIS]

#3638: v.distance linear matrix remove duplicate cat column & table associated
without having map of distance lines
--+-
  Reporter:  Maellevd |  Owner:  grass-dev@…
  Type:  enhancement  | Status:  closed
  Priority:  normal   |  Milestone:
 Component:  Vector   |Version:  7.4.0
Resolution:  worksforme   |   Keywords:  v.distance
   CPU:  Unspecified  |   Platform:  Linux
--+-
Changes (by sbl):

 * status:  new => closed
 * resolution:   => worksforme


Comment:

 Please try the p-flag for generating only the table.
 https://grass.osgeo.org/grass74/manuals/v.distance.html

 As for the "duplicate" columns: Did you have a scroll down to from_cat 2?
 From there cat and to cat should no longer be duplicates...

 In principle, such questions are better asked at the user-mailing list
 where you get more attention for the question. Closing this ticket as
 worksforme, as I think what you want to achieve is already possible.
 Please feel free to reopen if mailing list confirms lacking features or
 unintended behavior…

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[GRASS-dev] [GRASS GIS] #3638: v.distance linear matrix remove duplicate cat column & table associated without having map of distance lines

[GRASS GIS]

#3638: v.distance linear matrix remove duplicate cat column & table associated
without having map of distance lines
-+-
 Reporter:  Maellevd |  Owner:  grass-dev@…
 Type:  enhancement  | Status:  new
 Priority:  normal   |  Milestone:
Component:  Vector   |Version:  7.4.0
 Keywords:  v.distance   |CPU:  Unspecified
 Platform:  Linux|
-+-
 Hello,
 I would like to receive some details related to the v.distance module with
 the graphical interface in GRASS 7.4.1.

 1) When I try to generate a linear matrix of distances using v.distance, I
 observe that the output contains a duplicate column (denoted “to_cat” and
 "cat" in the example below).
 Is there a reason for that ?
 Is there a way to generate a linear matrix of distances without that
 duplicated column ?

 ==
 Here's an example command I ran:
 {{{
 v.distance -p -a from=hospitals@x to= hospitals@x upload=cat,dist
 }}}
 with the following output:
 from_cat | to_cat | cat | dist
 1 | 1 | 1 | 0
 1 | 2 | 2 | 7489.1043632983983
 1 | 3 | 3 | 339112.17046729225
 ...
 ==


 2) When creating a table associated with the distance matrix:

 a) why do my vector layers need to belong to the current mapsets while the
 goal is not to update the vector layers ?

 Example:
 ==
 Command:
 {{{
 v.distance -a from=hospitals@PERMANENT to= hospitals@PERMANENT
 output=map_connect_hospital_PERM upload=cat,dist column=to_cat,dist_min
 table=tabl_dist_PERM
 }}}

 Output: ERROR: Bug: tentative de mise à jour d'une couche qui n'est pas
 dans le jeu de cartes courant
 ==

 b) why do you have to create a map of distance lines?
 Indeed, it seems to me that it would be interesting to generate the table
 without having this map.

 Example:
 ==
 Command:
 {{{
 v.distance -a from=hospitals@x to=hospitals@x output=map_connect_hospital
 upload=cat,dist column=to_cat,dist_min table=tabl_dist
 }}}

 ==

 How to get rid of this "output = map_connect_hospital" option and just get
 the table?


 Thank you in advance for your feedback on these two concerns

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