Bug report #5032
`log(100,10)` does not give the same result as `log10(100)`!
| Status: | Closed | ||
|---|---|---|---|
| Priority: | High | ||
| Assignee: | - | ||
| Category: | Vectors | ||
| Affected QGIS version: | master | Regression?: | No |
| Operating System: | Easy fix?: | No | |
| Pull Request or Patch supplied: | No | Resolution: | invalid |
| Crashes QGIS or corrupts data: | No | Copied to github as #: | 14807 |
Description
log(a,10) currently gives 1/log10(a)
log_help_fix.diff 
(1.08 KB)
History
#1
Updated by Alister Hood almost 13 years ago
Sorry - I neglected to say that this is of course in the new field calculator and expression based labelling.
And you'll see the same effect comparing with ln()
#2
Updated by Martin Dobias over 12 years ago
- Resolution set to invalid
- Status changed from Open to Closed
The order of parameters is actually reversed from what you have expected: log(base,x) - that follows order used in other SQL engines (postgresql, mysql).
#3
Updated by Alister Hood over 12 years ago
- File log_help_fix.diff added
Of course, thanks.
So unless it has changed since, I made a mistake when I wrote the help for it.
We need this fix.