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function [stk,txt,top]=sci_stem()
// Copyright INRIA
txt=[]
if rhs==3|stk(top)(5)=='10' then
style=linetype(stk(top)(1))
top=top-1
rhs=rhs-1
else
style=-1
end
style=sci2exp(style)
if rhs==1 then
x=tempvar(1)
if isname(stk(top)(1)) then
y=stk(top)(1)
else
y=tempvar(2)
txt=y+' = '+stk(top)(1);
end
txt=[txt;
x+' = 1:size('+y+',''*''))'
'plot2d'+rhsargs([x,y,'-9'])]
if stk(top)(3)=='1' then // row vector
txt=[txt;'xsegs'+rhsargs(['[1;1]*'+x,'[1;1]*'+y,style])]
elseif stk(top)(4)=='1' then // column vector
txt=[txt;'xsegs'+rhsargs(['[1;1]*'+x,'[1;1]*'+y+'''',style])]
else // unknown shape
txt=[txt;'xsegs'+rhsargs(['[1;1]*'+x,'[1;1]*'+y+'(:)''',style])]
end
elseif rhs==2 then
if isname(stk(top)(1)) then
y=stk(top)(1)
else
y=tempvar(2)
txt=[txt;y+' = '+stk(top)(1)];
end
if isname(stk(top-1)(1)) then
x=stk(top-1)(1)
else
y=tempvar(2)
txt=[txt;y+' = '+stk(top-1)(1)];
end
if stk(top)(4)=='1' then //y is a column vector
txt=[txt;y+' = '+y+'''']
elseif stk(top)(3)<>'1' then //y has unknown shape
txt=[txt;y+' = '+y(:)+'''']
end
if stk(top-1)(4)=='1' then //x is a column vector
txt=[txt;x+' = '+x+'''']
elseif stk(top-1)(3)<>'1' then //x has unknown shape
txt=[txt;x+' = '+x(:)+'''']
end
txt=[txt;
'plot2d'+rhsargs([x,y,'-9'])
'xsegs'+rhsargs(['[1;1]*'+x,'[1;1]*'+y,style])]
top=top-1
end
stk=list(' ','-2','0','0','0')
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