# Tag Info

## New answers tagged packages

0

The original call to Begin["Private"]; has an extra "" before "Private".

1

This is sort of what the Private context is meant to be doing for you. You write that you just need more contexts that can behave like Private context for organizational purposes, and this can be achieved using subcontexts that use a Private mark. My normal instinct would be to put the helper functions to MainFunction inside a Private branch of ...

2

I'm no expert on SciDraw, perhaps one will chime in. I'm sure the way to do what you are asking is somewhere in the accepted options, there are many of them Options@DataPlot // Length Options@FigurePanel // Length Options@Multipanel // Length (* 204 *) (* 495 *) (* 502 *) Here is the best kludge I could work out using this package without learning all ...

2

To the best of my knowledge, the answer to your question is simply: no. Meta comments: I don't think your question ought to be closed as "out of scope", since you are not actually asking for anyone to write the function for you. My suggestion would be to write the function yourself and edit the question to include your attempt, making the focus of the ...

3

If you look at ?FieldDerivative you see that it contains following text NOTICE: FieldDerivative is defined only for objects with head \ QuantumField[...]. If the space-time derivative of other objects is \ wanted, the corresponding rule must be specified. I.e. FieldDerivative is used for deriving Feynman rules, but not for differentiating Lorentz ...

7

I've certainly encountered this behavior before. While I can't speak authoritatively, I'd think this is as designed, although it does introduce certain inconsistency. I also think that this issue is a result of clash of cultures: the end user - oriented one from the earlier days of Mathematica, and the one coming from standard software-engineering practices. ...

2

What features I/we/developers need: allowing (only) MyPackage to use particular non System packages e.g. using GeneralUtilities functions after BeginPackage["MyPackage"] allowing user to use particular non System packages (only) after loading MyPackage e.g. After << MyPackage I would like to be able to call PrintDefinitions from ...

10

This appears to be a difference in parsing between the frontend and the kernel. Compare (in a notebook) HoldForm[\[LeftCeiling]x\[RightCeiling] + 1] (* Ceiling[x] + 1 *) with Get[StringToStream["HoldForm[\[LeftCeiling]x\[RightCeiling] + 1]"]] (* Ceiling[x] (+1) *) where the latter has multiplication instead of addition. One possible workaround is ...

2

It seems to me that setenv is being used here to set the values of a series of helper variables that are then used by the other functions in the code. This (is awful but) works within a single notebook because all those variables are visible to all functions. I suspect, however, that once you put the code in a package, you run into context problems. Those ...

1

The RGTensors definition in the EDCRGTCcode.m file for that package starts as follows: RGtensors[gIN_, xIN_, opt___] := Module[ {frameOpt = 0, eIN, Ropt = True, Wopt = True, Eopt = True, idMat, eFrame, dxRul, Bmat, Amat, NP$= False, de, k$, StrCon, γUdd, γddd, g1ddd, g2ddd, Gamddd, rmn, tmp, RUd, Rg, gg, sT, Cflat, EinSp}, Clear[ ...

3

The Autoload mechanism can be used for this. Place the package in $UserBaseDirectory/Autoload or$BaseDirectory/Autoload. However, the package must follow the standard structure, and must have a Kernel/init.m file, otherwise it won't get loaded. Also keep in mind that auto-loading of packages happens only after $UserBaseDirectory/Kernel/init.m was loaded ... 7 In order for a package in Autoload to load, it must have the file Kernel/init.m. Thus, Autoload/MyPack.m will not load. Autoload/MyPack/MyPack.m will also not load. Instead, we need to have the following structure: A package file at Autoload/MyPack/Mypack.m and an initialization file for the package at Autoload/MyPack/Kernel/init.m, containing the ... 0 the function FormCoef[x_,y_] defined in the package should give you the result you want. This function gives the "left-coefficient" of the differential form y in the differential form expression x, i.e., writes x as Wedge[w,y] + terms not containing y and returns w. 3 It returns 0 because you are doing something like: D[ Sin[Globalx1], MyPPrivatex1] (*Global or current$Context really*) Why? You can read more in a related topic: Behavior of Remove inside a Package and in the general one I'm encouraging you to become familiar with: How symbol lookup actually works There are some tricks available to detect a ...

3

I think in general no one know's how to express roots of polynomials in terms of radicals, or even determine when it's possible. Quintics has been solved and there's a Mathematica package to solve them. Radicals.nb SolveQuintic[x^5 + 20 x + 32 == 0, x] For sextics I believe the most that is known is how to determine which equations can be expressed in ...

10

As a more direct answer to the question of memory we can check with a test. In[1]:= MemoryInUse[] (* Out[1]= 34093104 *) In[2]:= bunchOfSymbols = Table[Unique[], {26000}]; In[3]:= foo[Sequence @@ bunchOfSymbols] := bar; In[4]:= MemoryInUse[] (* Out[4]= 43032256 *) In[5]:= Remove @@ bunchOfSymbols; In[6]:= MemoryInUse[] (* Out[6]= 41577200 *) ...

19

I decided to take one of my large packages and Remove all symbols in the Private context that have no definitions attached to them ... And is there any risk if only those symbols that are not used globally or that do not have definitions are carefully removed? In general, the complexity of the Mathematica language and the intricacies of the ...

1

Maybe this is the problem, there is a bug with feyncalc 8 and linux 12 http://www.feyncalc.org/forum/0768.html

4

Once you've loaded the package in with Needs then you can find all the included functions using Names with a wildcard: Needs["VariationalMethods"] Names["VariationalMethods*"] (* {"EulerEquations", "FirstIntegral", "FirstIntegrals", "NVariationalBound", "VariationalBound", "VariationalD"} *) or Needs["PolyhedronOperations"] ...

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