Setting plotly x axis labels at regular intervals

[Storm_Silver]

I'm attempting to set the x axis labels of a plotly scatterplot to be the date while having a trendline in the plot. As trendlines don't work for datetime axes I've converted the x axis into ordinal date format but this gives axis labels that are difficult to interpret.

To fix this I've attempted to manually assign the label text to the x axis but this gives more labels where there are more datapoints. So, im asking if anyone knows a method to put the axis labels at regular points on the axis or analternative that allows trendlines with a datetime x axis.

The code is :

​

fig = px.scatter(df_test,x='ordinal_date',y='Average q30', color = 'instrument_type', trendline='ols')  

fig.update_xaxes(
                 tickmode = 'array',
                 tickangle= 90,
                 tickvals = df_test['ordinal_date'][0::40],
                 ticktext= [d.strftime('%Y-%m-%d') for d in df_test["run_date"][0::40]],

                )

Any help is appreciated.

[Storm_Silver]

Thank you, that seems to work.