#12922: Implicit derivative
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Reporter: mmarco | Owner: burcin
Type: enhancement | Status: needs_review
Priority: major | Milestone: sage-5.3
Component: calculus | Resolution:
Keywords: implicit derivative | Work issues:
Report Upstream: N/A | Reviewers:
Authors: Miguel Marco | Merged in:
Dependencies: | Stopgaps:
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Comment (by sjg10):
Calling `var` or `SR.symbol('somename') even locally` does add to the
`pynac_symbol_registry`, yet calling `SR.symbol()` with no argument will
create a temporary variable that will not be added to this registry.
Possibly adding to the registry may cause problems if it is being
referenced directly for some reason. Maybe worth just using `x =
SR.symbol()` etc?
{{{
sage: from sage.symbolic.ring import pynac_symbol_registry
sage: pynac_symbol_registry
{'some_variable': some_variable, 'A': A, 'C': C, 'B': B, 'E': E, 'D': D,
'G': G, 'F': F, 'H': H, 'K': K, 'J': J, 'M': M, 'L': L, 'N': N, 'Q': Q,
'P': P, 'S': S, 'R': R, 'U': U, 'T': T, 'W': W, 'V': V, 'Y': Y, 'X': X,
'Z': Z, 'a': a, 'c': c, 'b': b, 'd': d, 'g': g, 'f': f, 'h': h, 'k': k,
'j': j, 'm': m, 'l': l, 'o': o, 'n': n, 'q': q, 'p': p, 's': s, 'r': r,
'u': u, 't': t, 'w': w, 'v': v, 'y': y, 'x': x, 'z': z}
sage: def f(): temp = SR.symbol()
....:
sage: f()
sage: pynac_symbol_registry
{'some_variable': some_variable, 'A': A, 'C': C, 'B': B, 'E': E, 'D': D,
'G': G, 'F': F, 'H': H, 'K': K, 'J': J, 'M': M, 'L': L, 'N': N, 'Q': Q,
'P': P, 'S': S, 'R': R, 'U': U, 'T': T, 'W': W, 'V': V, 'Y': Y, 'X': X,
'Z': Z, 'a': a, 'c': c, 'b': b, 'd': d, 'g': g, 'f': f, 'h': h, 'k': k,
'j': j, 'm': m, 'l': l, 'o': o, 'n': n, 'q': q, 'p': p, 's': s, 'r': r,
'u': u, 't': t, 'w': w, 'v': v, 'y': y, 'x': x, 'z': z}
sage: def f(): temp = SR.symbol('temp')
....:
sage: f()
sage: pynac_symbol_registry
{'temp': temp, 'some_variable': some_variable, 'A': A, 'C': C, 'B': B,
'E': E, 'D': D, 'G': G, 'F': F, 'H': H, 'K': K, 'J': J, 'M': M, 'L': L,
'N': N, 'Q': Q, 'P': P, 'S': S, 'R': R, 'U': U, 'T': T, 'W': W, 'V': V,
'Y': Y, 'X': X, 'Z': Z, 'a': a, 'c': c, 'b': b, 'd': d, 'g': g, 'f': f,
'h': h, 'k': k, 'j': j, 'm': m, 'l': l, 'o': o, 'n': n, 'q': q, 'p': p,
's': s, 'r': r, 'u': u, 't': t, 'w': w, 'v': v, 'y': y, 'x': x, 'z': z}
}}}
--
Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/12922#comment:6>
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