Thanks, Wouter and Nicolas I will give it a try.
Cheers Ming On Sun, Apr 24, 2022 at 9:33 AM Wouter Impens via Qgis-user < qgis-user@lists.osgeo.org> wrote: > Hi, > > If you have a field to join on, you could export the dataframe to > something that is readable in QGIS like csv or xlsx > > Greetings > Wouter > > Op za 23 apr. 2022 om 19:34 schreef Nicolas Cadieux via Qgis-user < > qgis-user@lists.osgeo.org>: > >> Hi Ming, >> >> The best thing would be to show your code and ask others how it can be >> optimized. I find that https://gis.stackexchange.com/ is the best place >> to do this but this user list definitely has some very competent >> programmers. Not being one of those competent programmers, I will just >> state that pandas and geopandas use a process called vectorization where >> the “for loop” is done for you. >> >> >> https://medium.com/analytics-vidhya/understanding-vectorization-in-numpy-and-pandas-188b6ebc5398 >> >> This means that looping over elements in a dataframe can be MUCH slower >> than using vectorization. So basically, you need to figure out the right >> code and avoid “for loops“ when using dataframes. >> >> Hope this helps >> >> Nicolas Cadieux >> https://gitlab.com/njacadieux >> >> Le 22 avr. 2022 à 11:50, ming han via Qgis-user < >> qgis-user@lists.osgeo.org> a écrit : >> >> >> Hi everyone >> >> Is there an efficient way to copy data in a pandas dataframe to the >> vector attribute table? >> >> I am looping element by element, which is very slow. >> >> Thanks >> Ming >> _______________________________________________ >> Qgis-user mailing list >> Qgis-user@lists.osgeo.org >> List info: https://lists.osgeo.org/mailman/listinfo/qgis-user >> Unsubscribe: https://lists.osgeo.org/mailman/listinfo/qgis-user >> >> _______________________________________________ >> Qgis-user mailing list >> Qgis-user@lists.osgeo.org >> List info: https://lists.osgeo.org/mailman/listinfo/qgis-user >> Unsubscribe: https://lists.osgeo.org/mailman/listinfo/qgis-user >> > _______________________________________________ > Qgis-user mailing list > Qgis-user@lists.osgeo.org > List info: https://lists.osgeo.org/mailman/listinfo/qgis-user > Unsubscribe: https://lists.osgeo.org/mailman/listinfo/qgis-user >
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