26
votes
List of symbols without built-in meaning
Updated to include both unary and binary operators
One idea is to use the usage message of a symbol as a clue that it has a special display form, probably with no built-in meaning. For example:
<...
- 127k
24
votes
Accepted
Shorthand for map at level 2
Corrected to use SubscriptBox as Rojo showed and Kvothe commented, fixing binding.
Rojo shows a way in Is it possible to define custom compound assignment ...
- 267k
20
votes
19
votes
How can I tell Mathematica to interpret 0xffff as a hexadecimal number?
Update
As pointed out by @Edmund, my initial answer didn't work with hex numbers starting with an integer. To fix that, I included an initial \[DiscretionaryHyphen]...
- 127k
16
votes
Defining indefinitely many functions
Agree with other answers, this is a bad idea (why, precisely do you want to do this?), but in the spirit of encouraging unmaintainable write-once read-never code, here's my entry into the freak show:
...
14
votes
Shorthand for map at level 2
I'm not aware of a simple one, but perhaps you could make your own? The following is not great because it requires you to enter CenterDot as Esc+.+Esc, and you can'...
- 22.4k
13
votes
Can symbols like + or * be used to denote the Plus and Times functions?
You can use the Notation package. It requires a GUI palette though.
Needs["Notation`"]
Once you have this package loaded, ...
- 4,256
12
votes
Defining indefinitely many functions
Just to be clear, I think this is a terrible idea but nevertheless, a question has been posed for which there is a simple answer:
...
- 87.7k
12
votes
How to use `in` for MemberQ
The big issue here is that ∈ is a system defined symbol and messing with it in this way can have all manner of unintended consequences. You don't know what is ...
- 40.7k
12
votes
Accepted
Is it possible to write time derivatives with the dot notation?
I can't test robustness, because I don't know what your work flow is, but one can Format the expression:
...
- 22.4k
11
votes
Accepted
Redefining a built-in operator
Use upvalues. You don't want || to change its behavior except when it's operating on impedances. So, use a wrapper (z[ ], say) around the quantities that represent impedances, and associate upvalues ...
- 13.6k
11
votes
List of symbols without built-in meaning
Here is an approach based on reading the Front End resource UnicodeCharacters.tr.
This method finds some operators that do not presently appear in Carl Woll's list ...
- 267k
10
votes
How to imitate list comprehensions for constant arrays?
The Notation package is not necessary to use an infix form of \[Star] as that is handled automatically. Also I recommend ...
- 267k
10
votes
Redefining a built-in operator
I don't like the idea of redefining Or (||). Rather, I would suggest defining a function with the name ...
- 107k
10
votes
Can we use letter with a subscript as a variable in Mathematica?
You can also do this:
<< Notation`
Symbolize[ParsedBoxWrapper[SubscriptBox["_", "_"]]]
If you want to, you can import the Notation package first, then use ...
- 305
10
votes
Series with specific notation
I think SeriesCoefficient is what you want. Then you can use it to display formatted formulas
...
- 43.2k
10
votes
What are the differences between using MakeBoxes and Interpretation?
Assuming that you want to create a special display form for foo that can be used in all contexts, you should use neither of these solutions. Why?
...
- 231k
10
votes
How can I tell Mathematica to interpret 0xffff as a hexadecimal number?
One approach is to the use that Notation Package's AddInputAlias function to setup an alias that will convert Esc 0x Esc to 16^^ ...
- 40.7k
9
votes
Accepted
Dot in place of prime to denote differentiation
Maybe this?
OverDot[f_, n_Integer] := Derivative[n][f]
It really only works for . and ...
- 226k
9
votes
One line definition of a symbol with plus-minus
The most robust way I know of would be to use the built in Notation package and write something like
...
- 1,130
9
votes
Can symbols like + or * be used to denote the Plus and Times functions?
For Plus, there's this, from How would I add together any list of arguments as a pure function?:
+Sequence[1, 2, 3]
(* 6 *)
- 226k
9
votes
How to use `in` for MemberQ
To avoid any conflict with the built-in symbol for \[Element], I would use the small element symbol, ∊ instead (this is a ...
- 96.2k
9
votes
Accepted
What are the differences between using MakeBoxes and Interpretation?
Point of conversion
A large and perhaps key difference is that MakeBoxes (foo) only transforms the expression into the expanded ...
- 267k
9
votes
How can I automatically replace [[ and ]] with the \[LeftDoubleBracket] and \[RightDoubleBracket] operators?
You can use CellEpilog to modify the contents of the cell upon evaluation:
...
- 30.2k
9
votes
How can I automatically replace [[ and ]] with the \[LeftDoubleBracket] and \[RightDoubleBracket] operators?
Here is a stylesheet solution modeled after Lucas' answer, except that I use CellEventActions to tie the transformation to a keyboard short cut:
...
- 127k
9
votes
Accepted
8
votes
How to use Feynman slash notation?
Here is a palette that does the slashing when you select a character and press the button:
...
- 96.2k
8
votes
Seeking more verbose syntax, e.g. "Then" -> ","
This still requires some commata and also additional brackets, but it might be somewhat more legible.
...
- 101k
8
votes
Accepted
Defining new brackets
One way of doing this is to use $Preprint:
First define the variables you want to print with double brackets. Then define a ...
- 37.7k
7
votes
Redefining a built-in operator
(I would love to hear from someone more knowledgeable about how to improve this answer.)
It is possible to redefine the || operator if you're willing to redefine ...
- 6,007
Only top scored, non community-wiki answers of a minimum length are eligible