Skip to main content

mathematical optimization - What is wrong with my ArgMin expression?


I need to find the minimum of a function $mj_1^2+mj_2^2$ where my $mj$ are constrained.


I wrote this expression:



ArgMin[
{mj1^2 + mj2^2, mj1 == (M1 + 1)*p1, p1 ∈ Integers,
mj2 == (M2 + 1)*p2, p2 ∈ Integers,
MemberQ[{mj1, mj2} , couplesm]}, {mj1, mj2}]

Indeed, my mj's must be multiples of Mj + 1, and they musn't be part of a list given by couplesm.


When I evaluate it, I get the following message;



ArgMin::infeas: There are no values of {mj1, mj2} for which the constraints False are satisfied and the objective function mj1^2 + mj2^2 is real valued.




I even added p1 and p2 to the variables of minimization, but it still didn't work.


How can I find the minimum of: $mj_1^2+mj_2^2$, where $mj_i$ is a multiple of $M_i+1$ and where the pairs $(mj_1,mj_2)$ can't be inside of the list couplesm?


Edit


I wrote the following and the code still doesn't work.


couplesm = {{0, 0}}


{{0, 0}}



ArgMin[

{mj1^2 + mj2^2,
IntegerQ[mj1/(M1 + 1)], IntegerQ[mj2/(M1 + 1)],
mj1 ∈ Integers, mj2 ∈ Integers,
Sequence @@ Table[{mj1, mj2} != couplesm[[i]], {i, 1, Length[couplesm]}]},
{mj1, mj2}]


ArgMin::infeas: There are no values of {mj1,mj2} for which the constraints False are satisfied and the objective function mj1^2+mj2^2 is real valued.


{Indeterminate, Indeterminate}






Comments

Popular posts from this blog

functions - Get leading series expansion term?

Given a function f[x] , I would like to have a function leadingSeries that returns just the leading term in the series around x=0 . For example: leadingSeries[(1/x + 2)/(4 + 1/x^2 + x)] x and leadingSeries[(1/x + 2 + (1 - 1/x^3)/4)/(4 + x)] -(1/(16 x^3)) Is there such a function in Mathematica? Or maybe one can implement it efficiently? EDIT I finally went with the following implementation, based on Carl Woll 's answer: lds[ex_,x_]:=( (ex/.x->(x+O[x]^2))/.SeriesData[U_,Z_,L_List,Mi_,Ma_,De_]:>SeriesData[U,Z,{L[[1]]},Mi,Mi+1,De]//Quiet//Normal) The advantage is, that this one also properly works with functions whose leading term is a constant: lds[Exp[x],x] 1 Answer Update 1 Updated to eliminate SeriesData and to not return additional terms Perhaps you could use: leadingSeries[expr_, x_] := Normal[expr /. x->(x+O[x]^2) /. a_List :> Take[a, 1]] Then for your examples: leadingSeries[(1/x + 2)/(4 + 1/x^2 + x), x] leadingSeries[Exp[x], x] leadingSeries[(1/x + 2 + (1 - 1/x...

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...

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-...