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#! /bin/sh
######################################
##### Model Transformation Tools #####
######################################
###############################################################
## Version control history
###############################################################
## $Id$
## $Log$
## Revision 1.21 1999/04/02 06:29:25 peterg
## New implicit method - solves numerical prob with ISW
##
## Revision 1.20 1999/04/02 02:13:58 peterg
## Back to RCS
##
## Revision 1.19 1999/03/30 21:39:25 peterg
## In implicit approach, set derivatives to zero (when switch is off)
## before update. This seems to stop numerical leakage though non-return
## switches.
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# MTTx = 0; # Dummy value
#endif;
[MTTy] = $1_odeo(MTTx,MTTu,MTTt); # Evaluate initial output
[MTTu] = $1_input(MTTt,MTTx,MTTy); # Evaluate initial input
mtt_write(MTTt,MTTx,MTTy,$Nx,$Ny); # And write them
[mttAA] = zero_matrix($Nx); # Zero the A matrix
[mttAAx] = zero_vector($Nx); # Zero the AAx vector
#[mttAA] = zero_matrix($Nx); # Zero the A matrix
#[mttAAx] = zero_vector($Nx); # Zero the AAx vector
if $Nx>0
[MTTx] = $1_switch(MTTx); # Switches
endif;
#if $Nx>0
# [MTTx] = $1_switch(MTTx); # Switches
#endif;
if mttmethod==1 # Euler
MTTddt = mttdt/mttstepfactor; # The small sample interval
endif;
for MTTit = 1:MTTilast #Integration loop
if $Nx>0 # Dont if no states
if mttmethod==1 # Euler
for MTTjt = 1:mttstepfactor
[MTTdx] = $1_ode(MTTx,MTTu,MTTt); # State derivative
[MTTopen] = $1_switchopen(MTTx); # Open switches
[MTTx] = mtt_euler(MTTx,MTTdx,MTTddt,$Nx); # Euler update
[MTTx] = mtt_euler(MTTx,MTTdx,MTTddt,$Nx,MTTopen); # Euler update
[MTTx] = $1_switch(MTTx); # Switches
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