function [bonds,status] = one_cause(bonds);
% one_cause - causality for a one junction
% 
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%     %%%%% Model Transformation Tools %%%%%
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% 
% Matlab function  one_cause


% %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
% %% Version control history
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% %% $Id$
% %% $Log$
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% Copyright (c) P.J. Gawthrop, 1996.

%Effort
[bonds,e_status] = juncause(bonds,-1,1);

%Flow
[bonds,f_status] = juncause(bonds,-1,-1);

if (e_status==1)|(f_status==1)       % Over causal
  status = 1;
elseif (e_status==-1)|(f_status==-1) % Under causal
  status = -1;
else                                  % causal
  status = 0;
end;