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Added docstring to chebD(n) #7

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Added docstring to chebD(n) #7

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4653a9d
Fixed division in quadroots.py
wallbryce Aug 29, 2025
8be2b59
added docstring to chebD(n)
wallbryce Aug 29, 2025
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15 changes: 13 additions & 2 deletions utils/chebutils.py
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Original file line number Diff line number Diff line change
Expand Up @@ -2,8 +2,19 @@

def chebD(n):
"""
Hint: https://people.maths.ox.ac.uk/trefethen/book.pdf, Chapter 6, pages
51-55.
Computes a spectral differentiation matrix and Chebysev grid
Parameters
----------
n: <int>
An integer defining the number of grid points (n+1)
Returns
-------
D: (n+1)x(n+1) matrix
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@fruzsinaagocs fruzsinaagocs Aug 29, 2025

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I'd write np.array<float>(n+1, n+1) , but this is good!

differentiation matrix
x: (n+1)-d array
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@fruzsinaagocs fruzsinaagocs Aug 29, 2025

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Consider np.array<float>(n+1,)

Chebysev grid
"""
if n == 0:
x = 1; D = 0; w = 0
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4 changes: 2 additions & 2 deletions utils/quadroots.py
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Expand Up @@ -21,7 +21,7 @@ def quadroots(a, b, c):
Roots of the equation.
"""

x1 = (-b + np.sqrt(b**2 - 4*a*c))/2*a
x2 = (-b - np.sqrt(b**2 - 4*a*c))/2*a
x1 = (-b + np.sqrt(b**2 - 4*a*c))/(2*a)
x2 = (-b - np.sqrt(b**2 - 4*a*c))/(2*a)

return (x1, x2)