Example: LaTeX Output

Example: Exporting to $\LaTeX$¶

The first code block contains the imports needed and defines a flag which determines whether the output $\LaTeX$ should be compiled.

In [1]:

# imports
import numpy as np
import subprocess

# Flag to compile output tables
compileLatex = False

The next code block loads the npz file created using the output from the Fama-MacBeth example. The second part shows a generic method to restore all variables. The loaded data is in a dictionary, and so iterating over the keys and using globals() (a dictionary) in the main program.

In [2]:

# Load variables
f = np.load('fama-macBeth-results.npz')
data = f.items()
# Manually load parameters and std errors
arp = f['arp']
arpSE = f['arpSE']
beta = f['beta']
betaSE = f['betaSE']
J = f['J']
Jpval = f['Jpval']

# Generic restore of all data in a npz file
for key in f.keys():
    globals()[key] = f[key]
f.close()

The document is be stored in a list. The first few lines contain the required header for a $\LaTeX$ document, including some packages used to improve table display and to select a custom font.

In [3]:

# List to hold table
latex = []
# Initializd LaTeX document
latex.append(r'\documentclass[a4paper]{article}')
latex.append(r'\usepackage{amsmath}')
latex.append(r'\usepackage{booktabs}')
latex.append(r'\usepackage[adobe-utopia]{mathdesign}')
latex.append(r'\usepackage[T1]{fontenc}')
latex.append(r'\begin{document}')

Table 1 is stored in its own list, and then extend will be used to add it to the main list.

In [4]:

# Table 1
table1 = []
table1.append(r'\begin{center}')
table1.append(r'\begin{tabular}{lrrr} \toprule')
# Header
colNames = [r'VWM$^e$','SMB','HML']
header = ''
for cName in colNames:
    header += ' & ' + cName

header += r'\\ \cmidrule{2-4}'
table1.append(header)
# Main row
row = ''
for a,se in zip(arp,arpSE):
    row += r' & $\underset{{({0:0.3f})}}{{{1:0.3f}}}$'.format(se,a)
table1.append(row)
# Blank row
row = r'\\'
table1.append(row)
# J-stat row
row = r'J-stat: $\underset{{({0:0.3f})}}{{{1:0.1f}}}$ \\'.format(float(Jpval),float(J))
table1.append(row)
table1.append(r'\bottomrule \end{tabular}')
table1.append(r'\end{center}')
# Extend latex with table 1
latex.extend(table1)
latex.append(r'\newpage')

Table 2 is a bit more complex, and uses loops to iterate over the rows of the arrays containing the $\beta$s and their standard errors.

In [5]:

# Format information for table 2
sizes = ['S','2','3','4','B']
values = ['L','2','3','4','H']
# Table 2 has the same header as table 1, copy with a slice
table2 = table1[:3]
m = 0
for i in range(len(sizes)):
    for j in range(len(values)):
        row = 'Size: {:}, Value: {:} '.format(sizes[i],values[j])
        b = beta[:,m]
        s = betaSE[m,1:]
        for k in range(len(b)):
            row += r' & $\underset{{({0:0.3f})}}{{{1: .3f}}}$'.format(s[k],b[k])
        row += r'\\ '
        table2.append(row)
        m += 1
    if i<(len(sizes)-1):
        table2.append(r'\cmidrule{2-4}')

table2.append(r'\bottomrule \end{tabular}')
table2.append(r'\end{center}')
# Extend with table 2
latex.extend(table2)

The penultimate block finished the document, and uses write to write the lines to the $\LaTeX$ file.

In [6]:

# Finish document   
latex.append(r'\end{document}')
# Write to table
fid = open('latex.tex','w')
for line in latex:
    fid.write(line + '\n')
fid.close()

Finally, if the flag is set, subprocess is used to compile the LaTeX.

In [7]:

# Compile if needed
if compileLatex:
    exitStatus = subprocess.run(['pdflatex', 'latex.tex'])