I created a time series scatter plot like example in https://plot.ly/pandas/time-series/.
I want to get time range values ( min and max dates) when I changed time span dynamically on x axis.
Then I am going to use selected time range values to create subset of data frame and map.
I will appreciate if you provide any information
The min and max values you are looking for are just
max(df['Date']). Now with regard to getting this information dynamically, I would actually suggest looking into Dash, another plotly product, to get information about changing a plot dynamically without having to replot.
Let me know if this helps.
P.S. for more reading on comparing date values in python, look here: https://stackoverflow.com/questions/8142364/how-to-compare-two-dates
thank you very much indeed.
I had no idea about Dash. By your mail, I looked at it.
It is something like python ploty server. Then I don’t need to use Django for plotty.
I looked at Dash.
But I still couldn’t get min and max time values, when I used select time range dynamically.
I used “relayoutData”. But it gives graph coordinates rather than dates.
I think I need to convert axis coords to date values. But I don’t know how.
I will appreciate any help
You can write a function that finds the corresponding date given a
rightdate and the values that those leftend and rightend dates map to. Something like this:
def get_date_from_axis_coords(leftdate, leftval, rightdate, rightval, value): inbetween_dates =  delta = rightdate - leftdate for i in range(delta.days + 1): inbetween_dates .append(leftdate + timedelta(days=i)) # the percentage (out of 1) of value between left value and right value value_fraction = (value - leftval) / (rightval - leftval) return inbetween_dates[ round(value_fraction * len(inbetween_dates))]
In this function you are interpolating between two dates and returning another date by first putting all dates between the leftdate and rightdate into a list and then finding the one that matches to the value you have.
Hope this helps.
but sorry, my confusion still goes on.
How do we get “leftdate” and “rightval” as values in code after zoom/relayout slider.
Now I don’t understand your question.
What does after ‘zoom/relayout slider’ mean?
my xaxis in time series from 1900 to 2017. when I select a time range, . xaxis changes dynamically by plotly.
I just want to get min and max dates as value in code.
Say, I select time range between 1.1.1980 to 1.1.1985
in python code:
min= ??? # how can I get 1.1.1980 here ?
thank a lot !!!
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