2.7. Figure Import/Export

2.7.1. Reading data

• with open('filename.csv') - context manager

• numpy.loadtxt('filename.csv', delimeter=',', unpack=True)

• csv.DictReader()

• pandas DataFrame

2.7.2. pandas and matplotlib

• All of plotting functions expect np.array or np.ma.masked_array as input

• Classes that are 'array-like' such as pandas data objects and np.matrix may or may not work as intended

• It is best to convert these to np.array objects prior to plotting

• Convert a pandas.DataFrame:

  import matplotlib.pyplot as plt
  import pandas as pd
  import numpy as np
  np.random.seed(0)
  
  a = pandas.DataFrame(np.random.rand(4,5), columns = list('abcde'))
  a_asndarray = a.values
  

2.7.3. Exporting

eps

pdf

png

ps

svg

raster graphics

vector graphics

Renderer	Filetypes	Type	Description
AGG	png	raster graphics	High quality images using the Anti-Grain Geometry engine
PS	ps, eps	vector graphics	Postscript output
PDF	pdf	vector graphics	Portable Document Format
SVG	svg	vector graphics	Scalable Vector Graphics
Cairo	png, svg	raster graphics, vector graphics	using the Cairo graphics library