In an Ipython notebook, I have defined a function to plot data. I would like to import the function in my current notebook to use it.
I tried to convert the mynotebook.ipynb to a mynotebook.py file and then just do
from mynotebook import myfunction
But I get an error.
The problem is that I wrote the original notebook with starting ipython with the option pylab.
That means that to make it work, instead of writing something like
x = arange(1,10)
y = arange(1,10)
scatter(x, y)
I should change it to the more explicit:
import numpy as np
import matplotlib as plt
x = np.arange(1,10)
y = np.arange(1,10)
plt.scatter(x, y)
In my case my file is quite complex and changing it will be a pain...
Is there a way to import my notebook without modifying the .py file line by line???
from matplotlib.pylab import *
will take care of all of your imports, but some of the interactive stuff (show etc) might not work correctly.
Related
I'm hoping to get some help here. I'm trying to create some simple bar/line graphs from a csv file, however, it gives me an empty graph until I open this csv file manually in excel and change the data type to numeric. I've tried changing the data type with pd.to_numeric but it still gives an empty graph.
The csv that I'm trying to visualise is web data that I scraped using Beautiful Soup, I used .text method do get rid of all of the HTML tags so maybe it's causing the issue?
Would really appreciate some help. thanks!
Data file: https://dropmefiles.com/AYTUT
import numpy
import matplotlib
from matplotlib import pyplot as plt
import pandas as pd
import csv
my_data = pd.read_csv('my_data.csv')
my_data_n = my_data.apply(pd.to_numeric)
plt.bar(x=my_data_n['Company'], height=my_data_n['Market_Cap'])
plt.show()
Your csv file is corrupt. There are commas at the end of each line. Remove them and your code should work. pd.to_numeric is not required for this sample dataset.
Test code:
from matplotlib import pyplot as plt
import pandas as pd
my_data = pd.read_csv('/mnt/ramdisk/my_data.csv')
fig = plt.bar(x=my_data['Company'], height=my_data['Market_Cap'])
plt.tick_params(axis='x', rotation=90)
plt.title("Title")
plt.tight_layout()
plt.show()
I am new to JupyterLab trying to learn.
When I try to plot a graph, it works fine on jupyter notebook, but does not show the result on jupyterlab. Can anyone help me with this?
Here are the codes below:
import pandas as pd
import pandas_datareader.data as web
import time
# import matplotlib.pyplot as plt
import datetime as dt
import plotly.graph_objects as go
import numpy as np
from matplotlib import style
# from matplotlib.widgets import EllipseSelector
from alpha_vantage.timeseries import TimeSeries
Here is the code for plotting below:
def candlestick(df):
fig = go.Figure(data = [go.Candlestick(x = df["Date"], open = df["Open"], high = df["High"], low = df["Low"], close = df["Close"])])
fig.show()
JupyterLab Result:
Link to the image (JupyterLab)
JupyterNotebook Result:
Link to the image (Jupyter Notebook)
I have updated both JupyterLab and Notebook to the latest version. I do not know what is causing JupyterLab to stop showing the figure.
Thank you for reading my post. Help would be greatly appreciated.
Note*
I did not include the parts for data reading (Stock OHLC values). It contains the API keys. I am sorry for inconvenience.
Also, this is my second post on stack overflow. If this is not a well-written post, I am sorry. I will try to put more effort if it is possible. Thank you again for help.
TL;DR:
run the following and then restart your jupyter lab
jupyter labextension install #jupyterlab/plotly-extension
Start the lab with:
jupyter lab
Test with the following code:
import plotly.graph_objects as go
from alpha_vantage.timeseries import TimeSeries
def candlestick(df):
fig = go.Figure(data = [go.Candlestick(x = df.index, open = df["1. open"], high = df["2. high"], low = df["3. low"], close = df["4. close"])])
fig.show()
# preferable to save your key as an environment variable....
key = # key here
ts = TimeSeries(key = key, output_format = "pandas")
data_av_hist, meta_data_av_hist = ts.get_daily('AAPL')
candlestick(data_av_hist)
Note: Depending on system and installation of JupyterLab versus bare Jupyter, jlab may work instead of jupyter
Longer explanation:
Since this issue is with plotly and not matplotlib, you do NOT have to use the "inline magic" of:
%matplotlib inline
Each extension has to be installed to the jupyter lab, you can see the list with:
jupyter labextension list
For a more verbose explanation on another extension, please see related issue:
jupyterlab interactive plot
Patrick Collins already gave the correct answer.
However, the current JupyterLab might not be supported by the extension, and for various reasons one might not be able to update the JupyterLab:
ValueError: The extension "#jupyterlab/plotly-extension" does not yet support the current version of JupyterLab.
In this condition a quick workaround would be to save the image and show it again:
from IPython.display import Image
fig.write_image("image.png")
Image(filename='image.png')
To get the write_image() method of Plotly to work, kaleido must be installed:
pip install -U kaleido
This is a full example (originally from Plotly) to test this workaround:
import os
import pandas as pd
import plotly.express as px
from IPython.display import Image
df = pd.DataFrame([
dict(Task="Job A", Start='2009-01-01', Finish='2009-02-28', Resource="Alex"),
dict(Task="Job B", Start='2009-03-05', Finish='2009-04-15', Resource="Alex"),
dict(Task="Job C", Start='2009-02-20', Finish='2009-05-30', Resource="Max")
])
fig = px.timeline(df, x_start="Start", x_end="Finish", y="Resource", color="Resource")
if not os.path.exists("images"):
os.mkdir("images")
fig.write_image("images/fig1.png")
Image(filename='images/fig1.png')
I recently started using Pycharm instead of Jupyter on my laptop to do some light scientific work(mainly because I like how it auto-completes the code).
this code works fine I Jupyter
import sympy as sp
import matplotlib.pyplot as plt
x = sp.symbols("x")
sp.Integral(x, x)
but when I run it in Pycharm, nothing happens and I don't get any output and I don't know why.
Update: I've simplified my original question quite a bit.
I want to create an animated plot but my implementation is skipping frames.
x = np.arange(0,5,0.1)
y = np.cos(3*x)
def f(i):
plt.plot(x[:i],y[:i]);
plt.gca().axis([0,5,-1,1])
plt.gca().set_title(f'{i}')
interactive(f, i=Play(value=0, min=0, max=50, step=1))
Instead of my desired step size (1), it plays at about 5 steps per frame.
The bahavior happens on both the notebook and jupyterlab, and on both the inline and notebook frontends (%matplotlib notebook)
I think this is something to do with the time taken to execute the plotting function. Try to alter the interval between plotting, looks like this is specified in milliseconds.
%matplotlib inline
import numpy as np
import matplotlib.pyplot as plt
from ipywidgets import *
x = np.arange(0,5,0.1)
y = np.cos(3*x)
def f(i):
plt.plot(x[:i],y[:i]);
plt.gca().axis([0,5,-1,1])
plt.gca().set_title(f'{i}')
interactive(f, i=Play(value=0, min=0, max=50, step=1, interval=500))
I created the following Jupyter Notebook. Here three functions are shifted using three sliders. In the future I would like to generalise it to an arbitrary number of curves (i.e. n-curves). However, right now, the graph updating procedure is very slow and the graph itself doesn't seem to be fixed in the corrispective cell . I didn't receive any error message but I'm pretty sure that there is a mistake in the update function.
Here is the the code
from ipywidgets import interact
import ipywidgets as widgets
import numpy as np
import pandas as pd
import matplotlib.pyplot as plt
from IPython.display import display
x = np.linspace(0, 2*np.pi, 2000)
y1=np.exp(0.3*x)*np.sin(5*x)
y2=5*np.exp(-x**2)*np.sin(20*x)
y3=np.sin(2*x)
m=[y1,y2,y3]
num_curve=3
def shift(v_X):
v_T=v_X
vector=np.transpose(m)
print(' ')
print(v_T)
print(' ')
curve=vector+v_T
return curve
controls=[]
o='vertical'
for i in range(num_curve):
title="x%i" % (i%num_curve+1)
sl=widgets.FloatSlider(description=title,min=-2.0, max=2.0, step=0.1,orientation=o)
controls.append(sl)
Dict = {}
for c in controls:
Dict[c.description] = c
uif = widgets.HBox(tuple(controls))
def update_N(**xvalor):
xvalor=[]
for i in range(num_curve):
xvalor.append(controls[i].value)
curve=shift(xvalor)
new_curve=pd.DataFrame(curve)
new_curve.plot()
plt.show()
outf = widgets.interactive_output(update_N,Dict)
display(uif, outf)
Your function is running on every single value the slider moves through, which is probably giving you the long times to run you are seeing. You can change this by adding continuous_update=False into your FloatSlider call (line 32).
sl=widgets.FloatSlider(description=title,
min=-2.0,
max=2.0,
step=0.1,
orientation=o,
continuous_update=False)
This got me much better performance, and the chart doesn't flicker as much as there are vastly fewer redraws. Does this help?