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Results tagged with functions
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user 45626
Questions about the use of built-in Mathematica functions, including pure functions.
1
vote
2
answers
127
views
UnsameQ exhibits different behavior than !SameQ
I do not understand the UnsameQ[] behavior below. (I need UnsameQ[] as I may have variables in the array.)
{-7, 3, 2} /. x_ /; x == 3 -> w
(*{-7, w, 2}*)
{-7, 3, 2} /. x_ /; x != 3 -> w
(*{w, 3, w}* …
- 1,225
4
votes
0
answers
115
views
Order of evaluation of FunctionDomain, Reduce, Solve, etc
For the input (mine is much more complicated, this is a toy example):
x/x /. x -> 0
the output of 1 (as opposed to Indeterminate) is understood (although I cannot say I am happy about it), when loo …
- 1,225
2
votes
0
answers
140
views
How to prove subspaces of function spaces?
Element[x, Reals],
k1 (a1 x^2 + b1 x) + k2 (a2 x^2 + b2 x) == a3 x^2 + b3 x],
{a3, b3}, Reals]
which produces: a3 == a1 k1 + a2 k2 && b3 == b1 k1 + b2 k2
My question is how to do this for functions … I guess I would have to start with being able to define a vector space for functions, e.g., those defined (or continuous) on [0,2]. But I do not know how to do that. …
- 1,225
4
votes
1
answer
267
views
PlotLegends disappearing with list of functions
I know that funcs==={x^2}, so that is a list of functions of x, which it should be.
Thanx. …
- 1,225