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function [stk,txt,top]=sci_stairs()
// Copyright INRIA
txt=[]
if lhs==2 then
if rhs==1 then
stk=list('mtlb_stairs'+rhsargs(stk(top)(1)),'0','?','1','1')
else
r=list('mtlb_stairs'+rhsargs([stk(top-1)(1),stk(top)(1)]),'0','?','1','1')
stk=list(r,r)
top=top-1
end
else
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
if stk(top)(4)=='1' then // column vector
txt='plot2d2'+rhsargs([sci2exp('enn'),'0',y])
else // unknown shape
txt='plot2d2'+rhsargs([sci2exp('enn'),'0',y+'(:)'])
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;
'plot2d2'+rhsargs([sci2exp('gnn'),x,y])]
top=top-1
end
stk=list(' ','-2','0','0','0')
end
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