This used to work in SAGE 3.x
I'm using SAGE 4.0.1 now
sage: ciccio = {'x':10}
sage: a = 2*x + 5
sage: a
2*x + 5
sage: a.subs(ciccio)
---------------------------------------------------------------------------
TypeError Traceback (most recent call
last)
/home/nslabs/.sage/<ipython console> in <module>()
/home/nslabs/Desktop/sage-4.0.1-linux-Ubuntu_9.04-sse2-i686-Linux/
local/lib/python2.5/site-packages/sage/symbolic/expression.so in
sage.symbolic.expression.Expression.substitute (sage/symbolic/
expression.cpp:13696)()
/home/nslabs/Desktop/sage-4.0.1-linux-Ubuntu_9.04-sse2-i686-Linux/
local/lib/python2.5/site-packages/sage/symbolic/expression.so in
sage.symbolic.expression.Expression.coerce_in (sage/symbolic/
expression.cpp:9740)()
/home/nslabs/Desktop/sage-4.0.1-linux-Ubuntu_9.04-sse2-i686-Linux/
local/lib/python2.5/site-packages/sage/structure/parent_old.so in
sage.structure.parent_old.Parent._coerce_ (sage/structure/parent_old.c:
4632)()
/home/nslabs/Desktop/sage-4.0.1-linux-Ubuntu_9.04-sse2-i686-Linux/
local/lib/python2.5/site-packages/sage/structure/parent.so in
sage.structure.parent.Parent.coerce (sage/structure/parent.c:4765)()
TypeError: no canonical coercion from <type 'str'> to Symbolic Ring
Is it a known bug?
thanks
Maurizio
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