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function [stk,txt,top]=sci_rot90()
// Copyright INRIA
txt=[]
if rhs==1 then
if isname(stk(top)(1)) then
stk=list(stk(top)(1)+'(:,$:-1:1).''','0',stk(top)(3),stk(top)(4),'1')
else
v=gettempvar()
txt=v+' = '+stk(top)(1)
stk=list(v+'(:,$:-1:1).''','0',stk(top)(3),stk(top)(4),'1')
end
else
if isname(stk(top-1)(1)) then
v=stk(top-1)(1)
else
v=gettempvar()
txt=v+' = '+stk(top-1)(1)
end
k=stk(top)(1)
if isnum(k) then
k=evstr(k)
k = k-fix(k./4).*4;
if k<0 then k = k+4;end
if k==1 then
stk=list(v+'(:,$:-1:1).''','0',stk(top)(3),stk(top)(4),'1')
elseif k==2 then
stk=list(v+'($:-1:1,$:-1:1)','0',stk(top)(3),stk(top)(4),'1')
elseif k==3 then
stk=list(v+'($:-1:1,:).''','0',stk(top)(3),stk(top)(4),'1')
else
stk=list(stk(top-1)(1),'0',stk(top)(3),stk(top)(4),'1')
txt=[]
end
top=top-1
return
elseif isname(stk(top)(1)) then
k=stk(top)(1)
else
k=gettempvar(1)
txt=k+' = '+stk(top)(1)
end
B=gettempvar(2)
txt=[txt;
k+' = '+k+'-fix('+k+'./4).*4;'
'if '+k+'<0 then '+k+' = '+k+'+4;end'
'if '+k+'==1 then'
' '+B+' = '+v+'(:,$:-1:1).'''
'elseif '+k+'==2 then'
' '+B+' = '+v+'($:-1:1,$:-1:1)'
'elseif '+k+'==3 then'
' '+B+' = '+v+'($:-1:1,:).'''
'else'
' '+B+' = '+v
'end']
stk=list(B,'0',stk(top-1)(3),stk(top-1)(4),stk(top-1)(5))
top=top-1
end
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