How can I plot a bubble chart from a dataframe that has been created from a pandas crosstab of another dataframe?
Imports;
import plotly as py
import plotly.graph_objects as go
from plotly.subplots import make_subplots
The crosstab was created using;
df = pd.crosstab(raw_data['Speed'], raw_data['Height'].fillna('n/a'))
The df contains mostly zeros, however where a number appears I want a point where the value controls the point size. I want to set the Index values as the x axis and the columns name values as the Y axis.
The df would look something like;
10 20 30 40 50
1000 0 0 0 0 5
1100 0 0 0 7 0
1200 1 0 3 0 0
1300 0 0 0 0 0
1400 5 0 0 0 0
I've tried using scatter & Scatter like this;
fig.add_trace(go.Scatter(x=df.index.values, y=df.columns.values, size=df.values,
mode='lines'),
row=1, col=3)
This returned a TypeError: 'Module' object not callable.
Any help is really appreciatted. Thanks
UPDATE
The answers below are close to what I ended up with, main difference being that I reference 'Speed' in the melt line;
df.reset_index()
df.melt(id_vars="Speed")
df.rename(columns={"index":"Engine Speed",
"variable":"Height",
"value":"Count"})
df[df!=0].dropna()
scale=1000
fig.add_trace(go.Scatter(x=df["Speed"], y=df["Height"],mode='markers',marker_size=df["Count"]/scale),
row=1, col=3)
This works however my main problem now is that the dataset is huge and plotly is really struggling to deal with it.
Update 2
Using Scattergl allows Plotly to deal with the large dataset very well!
I recommend to use tidy format to represent your data. We say a dataframe is tidy if and only if
To create a more tidy-dataframe you can do
df = pd.crosstab(raw_data["Speed"], raw_data["Height"])
df.reset_index(level=0, inplace=True)
df.melt(id_vars=["Speed", "Height"], value_vars=["Counts"])
Speed Height Counts
0 1000 10 2
1 1100 20 1
2 1200 10 1
3 1200 30 1
4 1300 40 1
5 1400 50 1
The next step is to do the actual plotting.
# when scale is increased bubbles will become larger
scale = 10
# create the scatter plot
scatter = go.Scatter(
x=df.Speed,
y=df.Height,
marker_size=df.counts*scale,
mode='markers')
fig = go.Figure(scatter)
fig.show()
If this is the case you can use plotly.express
this is very similar to @Erik answer but shouldn't return errors.
import pandas as pd
import plotly.express as px
from io import StringIO
txt = """
10 20 30 40 50
1000 0 0 0 0 5
1100 0 0 0 7 0
1200 1 0 3 0 0
1300 0 0 0 0 0
1400 5 0 0 0 0
"""
df = pd.read_csv(StringIO(txt), delim_whitespace=True)
df = df.reset_index()\
.melt(id_vars="index")\
.rename(columns={"index":"Speed",
"variable":"Height",
"value":"Count"})
fig = px.scatter(df, x="Speed", y="Height",size="Count")
fig.show()
UPDATE In case you got error please check your pandas version
with pd.__version__
and try to check line by line this
df = pd.read_csv(StringIO(txt), delim_whitespace=True)
df = df.reset_index()
df = df.melt(id_vars="index")
df = df.rename(columns={"index":"Speed",
"variable":"Height",
"value":"Count"})
and report in which line it breaks.
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