TROLL - Impression.be

Finally TROLL offers extensive features to
interconnect external products. The list
presented in the figure above is not exhaustive
because of the wide possibilities available
through the TROLL Programming Language
and the generalised database interface to
SofTwaRe/oVeRView
connect your own formats.
The modeling language and the MODEL
Advanced and no limitation on size
The modeling language possesses the highest
level of sophistication, ideal for handling
complex non-linear systems.
• TROLL is already famous for handling
very large systems of equations (in tens
of thousands of equations and even more
depending on the RAM); therefore the tools
included to maintain the text of equations
are also very complete: Since TROLL is an
open system, the text file containing the
list of equations may be seen from the
MS-WINDOWS oriented TROLL text editor,
but also from any editor or text processor
package,
Endogenous
with leads
Nonnormalised
equations
DELL
(n-order
difference)
operator
used straight
on terms
This flexibility is important to interconnect any
kind of external products. For example, TROLL
recognises at least the EUROSTAT (Luxembourg)/
CRONOS databases, DATASTREAM files, etc.
• TROLL contains many functions to manipulate
the text of equations from Macros and/or
the TROLL Programming Language; here,
the processing may be very sophisticated,
by recognising operators, variable names,
functions, etc; imagine just having, at the
touch of a button, a toolbox for the complete
recognition of the grammar of your system
of equations.
Once a model is ready as a text file, TROLL will
compile its structure and mathematics. There is
no need for you to differentiate a right hand side
from a left hand side, and if it is more legible, a
term may be designated as the left hand side.
ADDSYM
ENDOGENOUS ... US_C US_MPC US_MPCINV US_PGNP US_PGNPNO ... ,
EXOGENOUS ... US_LAMBDA US_SIGMA ...;
ADDEQ BOTTOM
US_C : US_C = US_C_DI+US_C_PI ,
US_MPC : US_MPC = 1/US_MPCINV ,
US_MPCINV: US_MPCINV(1) = US_MPCINV - 1 - ((1 - US_SIGMA)*(US_RSR+US_PROB) - (
RES_US_MPC+US_PROB))*US_MPCINV/US_S IGMA ,
US_WH1 : US_WH1(1) =
US_WH1*
(1+US_RSR+US_ALPHA1+RES_US_WH 1+US_PROB+EXP( US_DLLF_SS) - 1)
- (((1 - US_BETA)*US_GDP*US_PGNP - US_TAXH)/US_P+RES_US_WK*US_WK) ,
US_PGNP: DEL(1: LOG(US_PGNPNO)) =
US_LAMBDA*(US_DELTA_PI*DEL(1: LOG( US_PGNPNO(1)))
+(1 - US_DELTA_PI)*DEL(1: LOG(US_PGNPNO( - 1))))
+(1 - US_LAMBDA)*DEL(1: LOG(US_PGNPNO( - 1)))
+US_GAMMA/100*(US_NLIN - US_UNR)/(US_UNR - US_PHI)
+RES_US_PGNP ,
...;
[Source: MULTIMOD MARK3, (c) IMF, Washington DC, USA]
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[ Figure 3: The MODELING LANGUAGE ]
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