Limitations

Currently the BPTK_Py framework is geared towards our own need and has a number of limitations. We are more than happy to extend the framework to suit YOUR need, so please let us what you need so that we can prioritize our activities. You can reach us at support@transentis.com

Here are the known limitations:

  • Currently the simulator only supports the Euler method, Runge-Kutta Integration is not supported.

  • The SD model transpiler for XMILE models only supports stocks, flows/biflows and converters. The discrete modeling elements (such as ovens and conveyors) are not supported.

  • The random number operators (LOGNORMAL, LOGISTIC etc.) support seed but uses the Python seed and random number generator as the Stella Architect random number function is not open source. Secondly, these operators only support the mandatory arguments (usually mean/scale/stddev) as given in in the official documentation

  • The following table gives an overview of all XMILE builtins, whether they are supported by the SD model transpiler for XMILE and their equivalent in the SD DSL library – blank cells indicate that the operator is currently not supported. We are working hard to ensure support for all operators is included ASAP. Built-ins pertaining to discrete elements are not listed.

Built-In

SD model transpiler

SD DSL equivalent

ABS

x

abs

AND

x

And

ARCCOS

x

arccos

ARCSIN

x

arcsin

ARCTAN

x

arctan

BETA

x

beta

BINOMIAL

x

binomial

COMBINATIONS

x

combinations

COS

x

cos

CGROWTH

x

CLOCKTIME

x

COSWAVE

x

coswave

COUNTER

x

DELAY

x

delay

DELAY1

x

DELAY3

x

DELAYN

x

DERIVN

x

DT

x

dt

ELSE

x

If

EXP

x

exp

EXPRND

x

exprnd

ENDVAL

x

FACTORIAL

x

factorial

FORCST

x

FV

x

GAMMA

x

gamma

GAMMALN

x

gammaln

GEOMETRIC

x

geometric

HISTORY

x

IF

x

If

INF

x

Inf

INTERPOLATE

x

INIT

x

INT

x

INVNORM

x

IRR

x

LOG10

x

LOGISTIC

x

logistic

LOGNORMAL

x

lognormal

LOOKUP

x

lookup

LOOKUPAREA

x

LOOKUPINV

x

LN

x

MAX

x

max

MEAN

x

MIN

x

min

MOD

x

% (simply use the Python mod operator)

MONTECARLO

x

montecarlo

NAN

x

nan

NEGBINOMIAL

x

NORMAL

x

NORMALCDF

x

NOT

x

Not

NPV

x

OR

x

Or

PARETO

x

pareto

PERCENT

x

PERMUTATIONS

x

permutations

PI

x

pi

PMT

x

POISSON

x

poisson

PREVIOUS

x

PULSE

x

pulse

PV

x

PROD

x

RANDOM

x

random

RANK

x

RAMP

x

REWORK

ROUND

x

round

ROOTN

x

RUNCOUNT

SAFEDIV

x

SELF

x

SENSIRUNCOUNT

SIN

x

sin

SINWAVE

x

sinwave

SIZE

x

SMTH1

x

smooth

SMTH3

x

SMTHN

x

SQRT

x

sqrt

STARTTIME

x

starttime

STDDEV

x

STEP

x

step

STOPTIME

x

stoptime

SUM

x

TAN

x

tan

THEN

x

if

TIME

x

time

TREND

x

trend

TRIANGULAR

x

triangular

UNIFORM

x

uniform

WEIBULL

x

weibull