EXPRESSION
function [x,y,typ]=EXPRESSION(job,arg1,arg2)
x=[];y=[];typ=[];
select job
case 'plot' then
standard_draw(arg1)
case 'getinputs' then
[x,y,typ]=standard_inputs(arg1)
case 'getoutputs' then
[x,y,typ]=standard_outputs(arg1)
case 'getorigin' then
[x,y]=standard_origin(arg1)
case 'set' then
x=arg1
model=arg1.model;graphics=arg1.graphics;
exprs=graphics.exprs
for ii=1:8,execstr('exprs(2)=varnumsubst(exprs(2),'"%u'"+string(ii),'"u'"+string(ii))'),end
atan2=atan
while %t do
%scicos_context=%scicos_context;
for ii=1:8,execstr('%scicos_context.u'+string(ii)+'=0'),end
iee=ieee()
ieee(2)
[ok,%nin,%exx,%usenz,exprs]=getvalue(..
['Give a scalar scilab expression using inputs u1, u2,...';
'If only one input, input is vector [u1,u2,...] (max 8)';
'ex: (dd*u1+sin(u2)>0)*u3';
'Note that here dd must be defined in context'],..
['Number of inputs';'Scilab expression';'Use zero-crossing (0: no, 1 yes)'],..
list('vec',1,'vec',1,'vec',1),exprs)
ieee(iee)
clear %scicos_context
if ~ok then break,end
%exx=strsubst(exprs(2),' ','')
if %exx==emptystr() then %exx='0',end //avoid empty
//expression
if %nin==1 then
%nini=8,
else
%nini=%nin
end
%head='%foo('
for %jji=1:%nini-1,%head=%head+'u'+string(%jji)+',',end
%head=%head+'u'+string(%nini)+')'
ok=execstr('deff(%head,%exx)','errcatch')==0
if ~ok then
message(['Erroneous expression';lasterror()])
else
if %nin>1 then
[model,graphics,ok]=check_io(model,graphics,ones(1,%nin),1,[],...
[])
else
[model,graphics,ok]=check_io(model,graphics,-1,1,[],...
[])
end
if ok then
[ok,%ok1,ipar,rpar,%nz]=compiler_expression(%foo)
if ~ok then
message(['Erroneous expression';lasterror()])
else
if %ok1 then
model.rpar=rpar
model.ipar=ipar
if %usenz then
model.nzcross=%nz
model.nmode=%nz
else
model.nzcross=0
model.nmode=0
end
for ii=1:8
execstr('exprs(2)=varnumsubst(exprs(2),'"u'"+string(ii),'"%u'"+string(ii))'),
end
graphics.exprs=exprs
x.graphics=graphics
x.model=model
break
end
end
end
end
end
case 'define' then
in=[1;1]
out=1
txt='(u1>0)*sin(u2)^2'
deff('%foo(u1,u2)',txt)
[%ok1,ipar,rpar,nz]=compile_expr(%foo)
model=scicos_model()
model.sim=list('evaluate_expr',4)
model.in=in
model.out=out
model.rpar=rpar
model.ipar=ipar
model.nzcross=nz
model.nmode=nz
model.dep_ut=[%t %f]
for ii=1:8
execstr('txt=varnumsubst(txt,'"u'"+string(ii),'"%u'"+string(ii))'),
end
exprs=[string(size(in,'*'));txt;'1']
gr_i=['xstringb(orig(1),orig(2),[''Mathematical'';''Expression''],sz(1),sz(2),''fill'');']
x=standard_define([3 2],model,exprs,gr_i)
end
endfunction
function [ok,%ok1,ipar,rpar,%nz]=compiler_expression(%foo)
ok=%t,%ok1=%f,ipar=[],rpar=[],%nz=[]
if exists('%scicos_context') then
%mm=getfield(1,%scicos_context)
for %mi=%mm(3:$)
if execstr(%mi+'=%scicos_context(%mi)','errcatch')<>0 then
ok=%f
end
end
end
if ok then
ok=execstr('[%ok1,ipar,rpar,%nz]=compile_expr(%foo)','errcatch')==0
end
endfunction
function [ok,%ipar,%rpar,%nz]=compile_expr(%foo)
ok=%t
atan2=atan // atan2 not defined in Scilab
%lst=macr2lst(%foo);
%mm=macrovar(%foo);
%MM=%mm(3);
%FF=['sin';'cos';'tan';'exp';'log';
'sinh';'cosh';'tanh';
'int';'round';'ceil';'floor';
'sign';'abs';'max';'min';
'asin';'acos';'atan';'asinh';'acosh';'atanh';
'atan2';
'log10';
]; // ops above 100
%num_arg=[1;1;1;1;1;
1;1;1
1;1;1;1;
1;1;2;2;
1;1;1;1;1;1;
2;
1
]; //number of arguments
%ZCR=[16,17,18,19,20,21,28,29,30,109,110,111,112,113,114,115,116]; // ops with zero-crossing
%UU=%mm(1)
%ipar=[]
%rpar=[]
%nrpar=0
%nz=0
%ijk=4
while %ijk<length(%lst)
%ijk=%ijk+1
select evstr(%lst(%ijk)(1))
case 2
%jjk=find(%lst(%ijk)(2)==%FF)
if %jjk<> [] then
if evstr(%lst(%ijk)(4))<>%num_arg(%jjk) then
message(%lst(%ijk)(2)+' must have '+string(%num_arg(%jjk))+' arguments')
ok=%f
return
else
%ipar=[%ipar;5;100+%jjk]
if or(100+%jjk==%ZCR) then %nz=%nz+1,end
%ijk=%ijk+1
end
else
%jjk=find(%lst(%ijk)(2)==%MM)
if %jjk<> [] then
if ~exists(%MM(%jjk)) then
message('Variable '+%MM(%jjk)+' is not defined.')
ok=%f
return
end
%var=evstr(%MM(%jjk))
if size(%var,'*')<>1 then
message('Variable '+%MM(%jjk)+' is not scalar.')
ok=%f
return
else
%nrpar=%nrpar+1
%rpar(%nrpar)=%var
%ipar=[%ipar;6;%nrpar]
end
else
%jjk=find(%lst(%ijk)(2)==%UU)
if %jjk<> [] then
%ipar=[%ipar;2;%jjk]
else
message('Unknow variable '+%lst(%ijk)(2))
ok=%f
end
//%ipar=[%ipar;2;evstr(strsubst(%lst(%ijk)(2),'u',''))]
end
end
case 5
// case of - with one operand (-u1)
if (evstr(%lst(%ijk)(2))==2)&(evstr(%lst(%ijk)(3))==1) then
%ipar=[%ipar;5;99]
else
%ipar=[%ipar;5;evstr(%lst(%ijk)(2))]
if or(evstr(%lst(%ijk)(2))==%ZCR) then %nz=%nz+1,end
end
case 6
// %ipar=[%ipar;6;evstr(%lst(%ijk)(2))]
%nrpar=%nrpar+1
%rpar(%nrpar)=evstr(%lst(%ijk)(2))
%ipar=[%ipar;6;%nrpar]
end
end
endfunction