Bug report #21347
[Processing] Matrix distance does not output right fields when using N x T matrix type
| Status: | Open | ||
|---|---|---|---|
| Priority: | Normal | ||
| Assignee: | - | ||
| Category: | Processing/QGIS | ||
| Affected QGIS version: | 3.5(master) | Regression?: | No |
| Operating System: | Easy fix?: | No | |
| Pull Request or Patch supplied: | No | Resolution: | |
| Crashes QGIS or corrupts data: | No | Copied to github as #: | 29165 |
Description
When running the distance matrix algorithm on all the features using the "Standard (N x T) distance matrix" type, you get columns corresponding to all target features.
When limiting the number of closest features to k, you get k new columns that do not necessarily match the closest features. I would expect to get:
- columns corresponding to each closest point ID (so the number may be different from k, depending on data distribution)
- and calculation between each input feature and the identified closest features
In the attached screenshot, k=1. Instead of a single column (28) corresponding to feature 0 target, I'd expect more to be added (3,6,8,9,10) as closest points to other inputs. So I have for each input its closest point and not the closest point of the first fetched feature which is neither the minimal distance between the layers.
History
#1
Updated by Giovanni Manghi almost 6 years ago
- Status changed from Open to Feedback
Did it worked as expected for example in 2.18?
#2
Updated by Harrissou Santanna almost 6 years ago
- Status changed from Feedback to Open
Never used it (came across this while documenting the algorithm). And don't have a 2.18 build anymore.