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260 #266

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9e69e91
Improve precision of v_from_i for large arguments
cwhanse Nov 12, 2016
3f9f37f
Fix type, add whatsnew note
Nov 16, 2016
53e5d2c
Merge remote-tracking branch 'refs/remotes/pvlib/master' into #260
cwhanse Nov 22, 2016
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8 changes: 8 additions & 0 deletions docs/sphinx/source/whatsnew/v0.4.2.txt
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Expand Up @@ -44,6 +44,9 @@ Enhancements
* Added name attribute to ModelChain and PVSystem. (:issue:`254`)
* Restructured API section of the documentation so that there are
separate pages for each function, class, or method. (:issue:`258`)
<<<<<<< HEAD
* Improved convergence of lambertw function (:issue: '260')
=======
* Improved Linke turbidity factor time interpolation with Python `calendar`
month days and leap years (:issue:`265`)

Expand All @@ -52,6 +55,7 @@ Other
~~~~~
* Typical modeling results could change by ~1%, depending on location, if they
depend on the turbidity table
>>>>>>> refs/remotes/pvlib/master


Code Contributors
Expand All @@ -60,4 +64,8 @@ Code Contributors
* Uwe Krien
* Will Holmgren
* Volker Beutner
<<<<<<< HEAD
* Cliff Hansen
=======
* Mark Mikofski
>>>>>>> refs/remotes/pvlib/master
3 changes: 2 additions & 1 deletion pvlib/pvsystem.py
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Expand Up @@ -1843,7 +1843,8 @@ def v_from_i(resistance_shunt, resistance_series, nNsVth, current,
# evaluation (above) results in NaN from overflow, 3 iterations
# of Newton's method gives approximately 8 digits of precision.
w = logargW
for i in range(0, 3):
order = np.ceil(np.log10(w)).astype(int)
for i in range(0, 3*order):
w = w * (1 - np.log(w) + logargW) / (1 + w)
lambertwterm_log = w

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