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I am using plotly and python to visualize 3D data and I encoutered a strange phenomenon when plotting some data. The following code visualizes data of the form (3,20) each for the direction x,y and z.

import numpy as np
import plotly.io as pio
import plotly.graph_objects as go

data = np.array([
    [4.41568822e+05, 4.41568474e+05, 4.41567958e+05, 4.41567603e+05,
     4.41567249e+05, 4.41566952e+05, 4.41566619e+05, 4.41566324e+05,
     4.41566021e+05, 4.41565737e+05, 4.41565435e+05, 4.41565098e+05,
     4.41564807e+05, 4.41564472e+05, 4.41564121e+05, 4.41563860e+05,
     4.41563538e+05, 4.41563226e+05, 4.41562933e+05, 4.41562641e+05],
    [5.71148897e+06, 5.71148909e+06, 5.71148928e+06, 5.71148942e+06,
     5.71148955e+06, 5.71148967e+06, 5.71148981e+06, 5.71148993e+06,
     5.71149006e+06, 5.71149019e+06, 5.71149032e+06, 5.71149047e+06,
     5.71149060e+06, 5.71149076e+06, 5.71149093e+06, 5.71149106e+06,
     5.71149122e+06, 5.71149137e+06, 5.71149153e+06, 5.71149168e+06],
    [1.86559470e+02, 1.86547226e+02, 1.86529120e+02, 1.86516642e+02,
     1.86504156e+02, 1.86493615e+02, 1.86481706e+02, 1.86471064e+02,
     1.86460026e+02, 1.86449593e+02, 1.86438417e+02, 1.86425803e+02,
     1.86414828e+02, 1.86402073e+02, 1.86388572e+02, 1.86378511e+02,
     1.86366018e+02, 1.86353893e+02, 1.86342497e+02, 1.86331154e+02]])

fig = go.Figure(data=[go.Scatter3d(x=data[0,:], y=data[1,:], z=data[2,:],
                                   mode='markers',
                                   marker=dict(size=3),
                                   )])

pio.show(fig, renderer='browser')

I have compared the result (top) below with a matplotlib plot of the same data (bottom).

The points that represent a relatively straight line are represented in Plotly in steps rather than in a line, and I don't really understand why.

Can someone explain to me why the points are displayed like this in plotly and how I can fix this problem? I appreciate any help I can get!

simknorke
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1 Answers1

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It looks like an issue with how Plotly is interpreting your numpy array. Your arrays look to be nested which would explain why instead of plotly drawing the plot as a continuous line they are being rendered as steps.

Dharman
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Benedict Groves
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  • Thanks for your reply. But each of keys x,y and z is a 1d array, so even when I change the input to lists the effect does not change. – simknorke Jan 26 '21 at 20:28