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Using 'date' type for scatter xaxis fails when coordinates stored in Numpy array #1927

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@jordanweaver

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@jordanweaver

It's possible (nay, likely) that I'm misunderstanding something but the docs indicate that Numpy arrays containing timestamps should be allowed. Yet, I'm currently having to cast this into a Pandas Series for it to work:

# plotly date axis bug?
import dash
import dash_core_components as dcc
import dash_html_components as html
import plotly.graph_objects as go

import numpy as np
import pandas as pd


app = dash.Dash(__name__)

timestamps = np.array(
    [
        '2017-05-24T23:00:21',
        '2017-05-24T23:00:23',
        '2017-05-24T23:00:25',
        '2017-05-24T23:00:27',
        '2017-05-24T23:00:29'
    ],
    dtype='datetime64[ns]'
)
fake_data = np.arange(len(timestamps))

fig_working = go.Figure().add_scatter(
    x=pd.Series(timestamps),
    y=fake_data
).update_layout(xaxis_type='date')


fig_working_not_so_much = go.Figure().add_scatter(
    x=timestamps,
    y=fake_data
).update_layout(xaxis_type='date')


app.layout = html.Div(
    [
        html.H1("Working with a pandas.Series:"),
        dcc.Graph(figure=fig_working),

        html.H1("Same data in a numpy.array:"),
        dcc.Graph(figure=fig_working_not_so_much),

        html.H1("😿")
    ]
)


if __name__ == '__main__':
    app.run_server(debug=True)

This yields:

image

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