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Typos in Mortgage Tutorial #215

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fumitoh merged 1 commit into from
Dec 27, 2025
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Typos in Mortgage Tutorial #215

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16 changes: 8 additions & 8 deletions doc/source/tutorial/mortgage.rst
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Original file line number Diff line number Diff line change
Expand Up @@ -173,7 +173,7 @@ As a Python function, the formula above can be expressed as follows::
def Balance(t):

if t > 0:
return Balance(t-1) * (1+Rate) - Payment
return Balance(t-1) * (1+Rate) - Payment()
else:
return Principle

Expand Down Expand Up @@ -214,7 +214,7 @@ you should get the following error message:
NameError: name 'Principal' is not defined

Formula traceback:
0: Mortgage.FixedRate.Payment(), line 3
0: Mortgage.Fixed.Payment(), line 3

Formula source:
def Payment():
Expand Down Expand Up @@ -330,11 +330,11 @@ You should get the following error, as there is a typo in the formula.
NameError: name 'Principle' is not defined

Formula traceback:
0: Mortgage.FixedRate.Balance(t=30), line 4
0: Mortgage.Fixed.Balance(t=30), line 4
...
28: Mortgage.FixedRate.Balance(t=2), line 4
29: Mortgage.FixedRate.Balance(t=1), line 4
30: Mortgage.FixedRate.Balance(t=0), line 6
28: Mortgage.Fixed.Balance(t=2), line 4
29: Mortgage.Fixed.Balance(t=1), line 4
30: Mortgage.Fixed.Balance(t=0), line 6

Formula source:
def Balance(t):
Expand All @@ -345,9 +345,9 @@ You should get the following error, as there is a typo in the formula.
return Principle

The error message tells you that a :obj:`NameError` is raised
in ``Mortgage.FixedRate.Balance(t=0)`` at line 6,
in ``Mortgage.Fixed.Balance(t=0)`` at line 6,
because the name ``Principle`` is not found in the namespace in which
``Mortgage.FixedRate.Balance(t=0)`` is executed.
``Mortgage.Fixed.Balance(t=0)`` is executed.

Correct the typo by going to *MxExplorer* and
changing ``Principle`` to ``Principal`` in the *Formula* pane.
Expand Down
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