Set coordinate origin plotly python

Dash Python
1

This is my code:

trace1 = go.Scatterpolar(
    r = r,
    theta = theta,
    mode='markers',
    marker=dict(
        size=12,
        color= iris.target,                
        opacity=1
        )
)

dc_1 = go.Scatterpolar( r = [0,V_r[0][0]],
                     theta = [0,V_r[0][1]],

                     marker = dict( size = 1,
                                    color = "rgb(84,48,5)"),
                     line = dict( color = "red",
                                width = 6),
                     name = "Var1"
                     )
dc_2 = go.Scatterpolar( r = [0,V_r[1][0]],
                   theta = [0,V_r[1][1]],

                   marker = dict( size = 1,
                                  color = "rgb(84,48,5)"),
                   line = dict( color = "green",
                                width = 6),
                   name = "Var2"
                 )
dc_3 = go.Scatterpolar( r = [0,V_r[2][0]],
                     theta = [0,V_r[2][1]],

                     marker = dict( size = 1,
                                  color = "rgb(84,48,5)"),
                     line = dict( color = "blue",
                                width = 6),
                     name = "Var3"
                 ) 
dc_4 = go.Scatterpolar( r = [0,V_r[3][0]],
                     theta = [0,V_r[3][1]],

                     marker = dict( size = 1,
                                  color = "rgb(84,48,5)"),
                     line = dict( color = "yellow",
                                width = 6),
                     name = "Var4"
                   )


data = [dc_1,dc_2,dc_3,dc_4, trace1]
layout = go.Layout( 
        xaxis=dict(
        title='PC1',
        rangemode='tozero',
        titlefont=dict(
           family='Courier New, monospace',
           size=18,
           color='#080707'
       )
   )
)
fig = go.Figure(data=data, layout=layout)
plot(fig, filename='Scatter polar, PCA.')

And this is the graph resultant:

Screenshot_2019-08-19%20Screenshot
Screenshot_2019-08-19 Screenshot.png763×751 61.3 KB

As you can see, currently the lines of the variables start from “0”, but the origin of coordinates is in r = - 5 (since that is the first value it receives) how can I set it to r = 0?

2

@josevera
r-coordinate is the radius. It cannot be a negative number. r is >=0. I cannot see where you initialized r=-5. Could you be more explicit to understand your issue?

3

ok, thank you @empet , that consideration I had not taken into account, I took as the left of the graph took it as the negative part, but it is true that this is indicated by the theta angle, and the radius has to be in absolute value.