@comment %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
@comment  Version control history
@comment %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
@comment  $Id$
@comment  $Log$
@comment  Revision 1.6  2001/10/15 14:29:50  gawthrop
@comment  Added documentaton on  [1:N] style port labels
@comment
@comment  Revision 1.5  2001/07/23 03:35:29  geraint
@comment  Updated file structure (mtt/bin).
@comment
@comment  Revision 1.4  2001/07/23 03:25:02  geraint
@comment  Added notes on -ae hybrd, rk4, ode2odes.cc, .oct dependencies.
@comment
@comment  Revision 1.3  2001/07/13 03:02:38  geraint

a valid name (@pxref{Valid names}.The name provides a link to more
information to be found in @xref{Labels (lbl)}. For example:
@example
R:r
@end example
@item type:label:cr
Not only are the type and the label of the component given, but also the
component cr argument. The type must be
a valid name (@pxref{Valid names}.The name provides a link to more
information to be found in @xref{Labels (lbl)}. For example:
@example
R:r:flow,r
@end example
@item type:label:expression
Expression is a mathematical expression relating the effort (called
mtt_e) to the flow (called mtt_f).
For example the following three forms are equivalent
@example
R:r:mtt_e=r*mtt_f
R:r:mtt_e-r*mtt_f=0
R:r:mtt_f=mtt_e/r
@end example
A non-linear example is:
@example
R:r:mtt_e = sin(mtt_f)
@end example

@item type*n
The name, together with the number @samp{n} of repetitions of the
component, are given. This repetition only makes sense if the component
has an even number of ports (@pxref{Port labels}); n copies of the component
are concatenated with odd Named ports (@pxref{Port labels}) of the
component being connected to the even Named ports of the previous
component in the chain in numerical order.  This feature is particularly

This transformation is implemented in GNU awk (gawk).
It scans both the fig file (@pxref{Language fig (abg.fig)})
and the label file (@pxref{Labels (lbl)}) and generates the rbg
 (@pxref{Language m (rbg.m)}) with components sorted according to the
label file.
It also generates a file sys_fig.fig containing details of the bond
graph with the components removed.


@node Language m (abg.m), Language tex (abg.tex), Language m (rbg.m), Acausal bond graph (abg)
@comment  node-name,  next,  previous,  up
@subsection Language m (abg.m)
@cindex Language m (abg.m) 
@cindex bonds
@cindex components

# Generated by MTT at Mon Jun 16 15:10:17 BST 1997

# %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
# %% Version control history
# %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
# %% $Id$
# %% $Log$
# %% Revision 1.6  2001/10/15 14:29:50  gawthrop
# %% Added documentaton on  [1:N] style port labels
# %%
# %% Revision 1.5  2001/07/23 03:35:29  geraint
# %% Updated file structure (mtt/bin).
# %%
# %% Revision 1.4  2001/07/23 03:25:02  geraint
# %% Added notes on -ae hybrd, rk4, ode2odes.cc, .oct dependencies.
# %%
# %% Revision 1.3  2001/07/13 03:02:38  geraint

@cindex component
@cindex Component library

If @strong{MTT} does not recognise a component (eg named MyComponent) as
a simple component (@pxref{Simple components}) or as already existing,
it searches the library search path $MTT_COMPONENTS
(@pxref{$MTT_COMPONENTS}) for a directory called MyComponent containing
MyComponent_lbl.txt. It then copies the @emph{entire} directory into the
current working directory. Thus, for example, the directory could
contain MyComponent_desc.tex MyComponent_abg.fig MyComponent_lbl.txt and MyComponent_cr.r in
addition to MyComponent_lbl.txt.



@c      node   next  prev  up
@node   Languages, Language tools, Extending MTT, Top
@chapter Languages
@cindex Languages
@pindex Languages

@comment      node-name, next,       previous, up
@unnumbered Index
@printindex cp

@contents

@bye