Changelog¶

DecoTengu 0.14.1¶

carefully account for floating point inaccuracy when calculating ascent and first decompression stop

change algorithm calculating length of decompression stop to check ascent ceiling limit without ascending to next decompression stop; this makes total decompression time of a dive longer by about 1 minute, but takes the same approach towards close ascent ceiling limit as in case of default first decompression stop search; it also boosts performance of the algorithm

use exponential function group homomorphism exp(x + y) = exp(x) * exp(y) to reimplement tabular calculator
above forced redesign of decompression model code with API changes
- TissueCalculator class is removed
- eq_schreiner function is removed
- TabTissueCalculator class is replaced with TabExp class and all other classes and functions related to tabular calculations are removed including tabular first decompression stop finder
the overall redesign of decompression model and tabular calculations code
- is much simpler with 10% lines of overall codebase removed
- uses less memory for tabular calculations
- boosts performance of basic decompression engine by 20% and tabular based decompression engine by almost 300%
changed all methods and functions to accept time in minutes instead of time in seconds

implemented new, faster and simpler algorithm finding first decompression stop
old algorithm finding first decompression stop, based on binary search, moved to decotengu.alt.bisect module as it still can be used for comparison purposes

memory usage improvements
API change: decompression table is Engine.deco_table attribute instead of being a coroutine

implemented tabular tissue saturation calculator to allow decompression calculations without exponential function
implemented naive algorithm calculating length of decompression stop using 1 minute interval; to be used for comparison purposes only
implemented initial support for calculations with decimal data type
various performance improvements

dive time changed to be dive bottom time (includes descent time)
allow to configure last decompression stop at 6m
various bug fixes
API changes
- added new dive phase GAS_MIX to allow identify gas mix switch easily
- DECOSTEP dive phase renamed to DECO_STEP
- ZH_L16_GF.pressure_limit renamed to ZH_L16_GF.ceiling_limit
internal API changes
- Engine._inv_ascent renamed to Engine._inv_limit
- Engine._inv_deco_stop accepts time parameter to enable last decompression stop at 6m
- Engine._deco_ascent replaced with Engine._deco_stop, the latter method does not perform any ascent anymore, just calculates decompression stop

check if dive is NDL dive before starting dive ascent
dt-plot script reimplemented to use R core plotting functions (ggplot2 no longer required)
added legend to plots created by dt-plot script
added documentation section about comparing dive decompression data with dt-plot script

all calculations are performed using pressure instead of depth
implemented deco model validator to check if first decompression stop is at ascent ceiling

gas mix switch is performed in more controlled manner
API has changed as conveyor functionality is removed from decompression engine class; instead, conveyor objects can be used to expand dive profile dive steps by replacing Engine.calculate method
added more detailed Schreiner equation description