add color to markers with plotly python

Question

How can I change marker's color based on the z array? The colors can be anything but need differ if value of z is differ! i understand that plotly express can do it, but i need to use plotly graph objects

I try to add a color=z entry but it report error!

import numpy as np
import plotly.graph_objects as go

def plot(x,y,z):
    fig = go.Figure()    
    trace1 = go.Scatter(
        x=x, y=y,
        z = z, #<- error line
        mode='markers',
        name='markers')
    
    fig.add_traces([trace1])
    
    tickvals = [0,np.pi/2,np.pi,np.pi*3/2,2*np.pi]
    ticktext = ["0","$\\frac{\pi}{2}$","$\pi$","$\\frac{3\pi}{4}$","$2\pi$"]
    layout = dict(
        title="demo",
        xaxis_title="X",
        yaxis_title="Y",
        title_x=0.5,   
        margin=dict(l=10,t=20,r=10,b=40),
        height=300,
        xaxis=dict(
            side='bottom',
            linecolor='black',
            tickangle=0,
            tickvals = tickvals,
            ticktext=ticktext,
            #tickmode='auto',
            ticks='outside',
            ticklen=7,
            tickwidth=1,
            tickcolor='black',
            tickson="labels",
            title=dict(standoff=5),
            showticklabels=True,
        ),
        yaxis=dict(
            showgrid=True,
            zeroline=True,
            zerolinewidth=.5,
            zerolinecolor='black',
            showline=True,
            linecolor='black',            
            showticklabels=True,
        )
    )

    fig.update_traces(
        marker_size=14,
    )    
    fig.update_layout(layout)
    
    save_fig(fig,"/vagrant/work/demo.png")
    fig.show()
    return

n = 20
x = np.linspace(0.0, 2*np.pi, n)
y = np.sin(x)
z = np.random.randint(0,100,size=n)

plot(x,y,z)

r-beginners · Accepted Answer · 2022-12-21 01:10:51Z

2

In this case, the desired graph can be created by specifying the z value in the marker color settings.

def plot(x,y,z):
    fig = go.Figure()    
    trace1 = go.Scatter(
        x=x, y=y,
        marker=dict(
            color = z),
        mode='markers',
        name='markers')
...

n = 20
x = np.linspace(0.0, 2*np.pi, n)
y = np.sin(x)
z = np.random.randint(0,100,size=n)

plot(x,y,z)

answered Dec 21, 2022 at 1:10

r-beginners

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