Skip to main content

Is it possible to get the order of inputs when "overloading" an orderless function?


When working with symbolic matrix operations or other objects which don't have commutative multiplication, it would be nice to not have to constantly switch out times for NonCommutativeMultiply (**). So I was wondering if there is a way to do something like


matrix /: Times[pre___, a_matrix, post___] :=  NonCommutativeMultiply[pre, a, post]
a = matrix["a"];
b = matrix["b"];

and then have it replaced automatically. However since Times is orderless, this doesn't preserve the order. In general, is it impossible to get the order of inputs when doing this kind of "overloading" though upvalues of an orderless function?



Answer



Well, you can sort of do this, by creating something like a continuation. This requires playing games with the Stack, and I don't claim that it is robust, but it may represent some theoretical interest, particularly to those of us looking for ways to implement continuations in Mathematica. Here is the code (edit please note that I had to add Update[matrix] to address some improper behavior noted in the comments end edit):



ClearAll[matrix, inMatrix];
matrix /: HoldPattern[Times[pre___, a_matrix, post___]] :=
(
Update[matrix];
ReleaseHold[NonCommutativeMultiply @@@ $stack]
);
matrix[args__] /; ! TrueQ[inMatrix] :=
Block[{inMatrix = True},
Update[matrix];
$stack = Stack[_][[-5]];

matrix[args]]

It combines UpValues, Villegas-Gayley trick to redefine a function, and manipuations with Stack. What happens is that first, of course, the attributes of Times are applied, I can't fight that. Then, the DownValues of matrix are applied, and at this point I record the relevant part of the Stack. Then, UpValues of matrix are applied, and at that point I communicate the recorded part of the stack, where the attributes of Times weren't yet applied, and Times gets replaced with NonCommutativeMultiply, after which I re-evaluate this, as if it was not evaluated before. The Update sommand is used to prevent caching the values for the $stack, as this is inappropriate here and resulted in some erroneous behavior noted in the comments.


Here are some examples:


a = matrix["a"];
b = matrix["b"];

a*c*b



matrix[a]**c**matrix[b]



f[g[1 + c*a*d*b*e]]


f[g[1 + c ** matrix["a"] ** d ** matrix["b"] ** e]]



I would not probably recommend such tricks for serious use, it is just interesting that you can use them to divert evaluation sequence in ways which seem to be impossible otherwise.


Comments

Popular posts from this blog

front end - keyboard shortcut to invoke Insert new matrix

I frequently need to type in some matrices, and the menu command Insert > Table/Matrix > New... allows matrices with lines drawn between columns and rows, which is very helpful. I would like to make a keyboard shortcut for it, but cannot find the relevant frontend token command (4209405) for it. Since the FullForm[] and InputForm[] of matrices with lines drawn between rows and columns is the same as those without lines, it's hard to do this via 3rd party system-wide text expanders (e.g. autohotkey or atext on mac). How does one assign a keyboard shortcut for the menu item Insert > Table/Matrix > New... , preferably using only mathematica? Thanks! Answer In the MenuSetup.tr (for linux located in the $InstallationDirectory/SystemFiles/FrontEnd/TextResources/X/ directory), I changed the line MenuItem["&New...", "CreateGridBoxDialog"] to read MenuItem["&New...", "CreateGridBoxDialog", MenuKey["m", Modifiers-...

How to thread a list

I have data in format data = {{a1, a2}, {b1, b2}, {c1, c2}, {d1, d2}} Tableform: I want to thread it to : tdata = {{{a1, b1}, {a2, b2}}, {{a1, c1}, {a2, c2}}, {{a1, d1}, {a2, d2}}} Tableform: And I would like to do better then pseudofunction[n_] := Transpose[{data2[[1]], data2[[n]]}]; SetAttributes[pseudofunction, Listable]; Range[2, 4] // pseudofunction Here is my benchmark data, where data3 is normal sample of real data. data3 = Drop[ExcelWorkBook[[Column1 ;; Column4]], None, 1]; data2 = {a #, b #, c #, d #} & /@ Range[1, 10^5]; data = RandomReal[{0, 1}, {10^6, 4}]; Here is my benchmark code kptnw[list_] := Transpose[{Table[First@#, {Length@# - 1}], Rest@#}, {3, 1, 2}] &@list kptnw2[list_] := Transpose[{ConstantArray[First@#, Length@# - 1], Rest@#}, {3, 1, 2}] &@list OleksandrR[list_] := Flatten[Outer[List, List@First[list], Rest[list], 1], {{2}, {1, 4}}] paradox2[list_] := Partition[Riffle[list[[1]], #], 2] & /@ Drop[list, 1] RM[list_] := FoldList[Transpose[{First@li...

plotting - How to draw lines between specified dots on ListPlot?

I would like to create a plot where I have unconnected dots and some connected. So far, I have figured out how to draw the dots. My code is the following: ListPlot[{{1, 1}, {2, 2}, {3, 3}, {4, 4}, {1, 4}, {2, 5}, {3, 6}, {4, 7}, {1, 7}, {2, 8}, {3, 9}, {4, 10}, {1, 10}, {2, 11}, {3, 12}, {4,13}, {2.5, 7}}, Ticks -> {{1, 2, 3, 4}, None}, AxesStyle -> Thin, TicksStyle -> Directive[Black, Bold, 12], Mesh -> Full] I have thought using ListLinePlot command, but I don't know how to specify to the command to draw only selected lines between the dots. Do have any suggestions/hints on how to do that? Thank you. Answer One possibility would be to use Epilog with Line : ListPlot[ {{1, 1}, {2, 2}, {3, 3}, {4, 4}, {1, 4}, {2, 5}, {3, 6}, {4, 7}, {1, 7}, {2, 8}, {3, 9}, {4, 10}, {1, 10}, {2, 11}, {3, 12}, {4, 13}, {2.5, 7}}, Ticks -> {{1, 2, 3, 4}, None}, AxesStyle -> Thin, TicksStyle -> Directive[Black, Bold, 12], Mesh -> Full, Epilog -> { Line[ ...