Perform calculation with various versions of variables
Project description
Varius
Perform computations using various versions of variables
Varius is the Latin word for "various."
Install
pip install varius
Usage Examples
import varius
from varius import *
# default variables
cst = vr('cost [usd]', 100)
rev = vr('revenue [usd]', 300)
# expressions: if values are not given the expressions will be symbolic
pft = ex('profit [usd]', rev - cst)
pmg = ex('profit margin', pft.expr/rev)
# show() will display the variables or expressions based on your python env
# if in jupyter notebooks, they will be displayed as beautiful latex equations otherwise as plain texts
with note('default') as d:
show(cst, rev, pft, pmg)
pft.grad()
pmg.grad()
print(d)
# new case
with note('20% discount', copy='default') as d:
rev(rev['default'] * 0.8)
show(cst, rev, pft, pmg)
pft.grad()
pmg.grad()
print(d)
# another case
with note('50% discount', copy='default') as d:
rev(rev['default'] * 0.5)
show(cst, rev, pft, pmg)
pft.grad()
pmg.grad()
print(d)
You will get summaries as follows:
Scope version: default
Variables:
(cost [usd]) = 100
(revenue [usd]) = 300
Expressions:
(profit [usd]) = 200
(profit margin) = 2/3
∂ [(profit [usd])] / ∂ [(cost [usd])] = -1
∂ [(profit [usd])] / ∂ [(revenue [usd])] = 1
∂ [(profit margin)] / ∂ [(cost [usd])] = -1/300
∂ [(profit margin)] / ∂ [(revenue [usd])] = 1/900
Scope version: 20% discount
Variables:
(cost [usd]) = 100
(revenue [usd]) = 240.0
Expressions:
∂ [(profit [usd])] / ∂ [(cost [usd])] = -1
∂ [(profit [usd])] / ∂ [(revenue [usd])] = 1
∂ [(profit margin)] / ∂ [(cost [usd])] = -0.00416666666666667
∂ [(profit margin)] / ∂ [(revenue [usd])] = 0.00173611111111111
(profit [usd]) = 140.000000000000
(profit margin) = 0.583333333333333
Scope version: 50% discount
Variables:
(cost [usd]) = 100
(revenue [usd]) = 150.0
Expressions:
∂ [(profit [usd])] / ∂ [(cost [usd])] = -1
∂ [(profit [usd])] / ∂ [(revenue [usd])] = 1
∂ [(profit margin)] / ∂ [(cost [usd])] = -0.00666666666666667
∂ [(profit margin)] / ∂ [(revenue [usd])] = 0.00444444444444445
(profit [usd]) = 50.0000000000000
(profit margin) = 0.333333333333333
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