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Questions on assigning and unassigning definitions to names that represent them, including issues raised by context and localization. Use tag [assignment] for issues relating to Set versus SetDelayed.

3
votes
2answers
Consider the following definition a = D[x,x] Now, a=1. Is there a way in which I can recover the information about the input definition of a, ie is it possible to define a function info such that …
asked Jan 24 '17 by Giancarlo
4
votes
1answer
Let's consider this function f[a_] := x^2 /. FindMinimum[-a x^2 + x^4, {x, 1}][[2]] Why the output of the following two Plot are different: Plot[f[y], {y, -3, 3}] Plot[f[x], {x, -3, 3}]
asked May 18 '17 by Giancarlo
0
votes
I have found these functions -given a symbol X it returns the input numbers in which the symbol is present SetAttributes[InNumber, HoldAll] InNumber[X_] := Union[First/@Position[Table[ToExpression[I …
answered Jan 25 '17 by Giancarlo
0
votes
1answer
I have an expression that involve variables and conjugate of the variables eg exp = a + (b + Abs[ c + I Conjugate[d]^3 ])^2 Conjugate[e] Conjugate[f] + Conjugate[g] Now I want to a) substitute t …
asked Oct 31 '16 by Giancarlo