Skip to main content

wolfram cloud - Installing packages on "Mathematica Online"


How can I install packages in Mathematica Online?


In particular, how can I install the xAct package?



Answer



In general, packages need to be placed in the Applications directory within $UserBaseDirectory. $UserBaseDirectory has different locations on different systems. With standard Mathematica, we can just evaluate $UserBaseDirectory to find this location, e.g. on a Windows system:


$UserBaseDirectory


(* "C:\\Users\\JoeUser\\AppData\\Roaming\\Mathematica" *)

Also, SystemOpen[$UserBaseDirectory] will open it in the system's file manager.


Note: not all packages follow the standard so be sure to read the package's documentation for package-specific installation instructions.



What about the cloud? (Note: I do not have access to Mathematica Online so I am going to work with the Programming Cloud, hoping that they're similar enough.) The value of $UserBaseDirectory has less information about how to actually put files there, but we can navigate to Home > Base using the cloud's file manager:



Navigate to Applications and place the package there.


A package may be a single .m or .wl file, in which case doing this is simple, or it may come as a directory, which makes uploading more difficult. I have not found a way to upload a directory (please let me know if there's a way!), so I took the following approach instead: upload an archive and extract it using ExtractArchive. Or we can download the file directly to the cloud using URLSave. Using xAct as an example,


SetDirectory@FileNameJoin[{$UserBaseDirectory,"Applications"}]


URLSave["http://www.xact.es/download/xAct_1.1.1.tgz","xAct.tgz"]

ExtractArchive["xAct.tgz"];

DeleteFile["xAct.tgz"]

Now we have the xAct directory within Base/Applications, the package is installed.



How to install xAct specifically? xAct follows the standard installation procedure, so the above steps work. But unfortunately it is not compatible with Mathematica Online because it relies on separate executables, which are not supported in the cloud due to security reasons.



enter image description here


In short, this package won't work because it's written in a mix of Mathematica and C. Most packages written in pure Mathematica should work.


Comments

Post a Comment

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-...
Post a Comment
Read more

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...
Post a Comment
Read more

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...
Post a Comment
Read more