Questions about contexts, which are used in Mathematica to organize defined symbols and avoid conflict between symbols that would otherwise have the same name. They are created when packages are loaded.

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5
votes
3answers
73 views

How can I pass replacement rules to a package-defined function and have it understand their context?

I am writing a package where I would like to be able to pass replacement rules to a function inside the package and have the function manipulate its symbols using those replacement rules. However, I'm ...
5
votes
1answer
80 views

Same name for functions in package and Global context

I am using a package that was written for Mathematica 3 while I am now working on Mathematica 8. I have issues with 2 functions in particular, Order and GraphComplement. They are a part of this ...
13
votes
3answers
237 views

How does $CellContext` work?

The only official info about $CellContext` I was able to find is: placeholder for the context of a symbol inside Dynamic ...
6
votes
1answer
74 views

Update/refresh notebook variable color on clear

By default, Mathematica displays variable names already assigned as black while new variables are displayed in blue. When executing Clear["Global`*"], variables ...
29
votes
3answers
317 views

How can I evaluate untrusted Mathematica code in a sandbox?

Is there any way to build a sandbox to evaluate untrusted Mathematica expressions in order to prevent them from having (malicious or accidental) harmful side effects? Context: I'm developing a system ...
10
votes
0answers
152 views

Autocomplete of non-global functions

In Mathematica 9 and 10 they added autocompletion. Out of the box this works great, but when I set the CellContext to "Notebook" ...
1
vote
1answer
21 views
2
votes
1answer
83 views

Why must I specify the Global context for a symbol in a private package?

I have written two versions of the function below in a package. When I load the package and call the function, Why does the first version where the variable s has no explicit Context return the long ...
22
votes
1answer
2k views

Why are some function names red?

I need to evaluate Needs["GraphUtilities`"] before I can use functions such as GraphPath[]. When I do so, some functions get ...
4
votes
1answer
1k views

FeynCalc “May shadow or be shadowed by other definitions”

So I've downloaded the latest FeynCalc from this site and put the extracted folder in user/me/library/Mathematica/application, but when I write the command ...
4
votes
1answer
58 views
2
votes
1answer
38 views

Import variable assignments from external files into different contexts

(I use Mathematica 9.0.1 on OS X 10.10.5.) I have two text files. One is named file1.txt with the contents ...
6
votes
1answer
101 views

When I run multiple Mathematica programs from terminal, are they supposed to use different Kernel?

Since I found that when I using notebook interface, I need to assign different kernels to different notebooks (if I want to run them at the same time), I wonder if I run those *.m files from terminal ...
2
votes
0answers
91 views

Shadowing issue with DeleteDuplicatesBy

I have been running a function in Mathematica 10 with the command, DeleteDuplicatesBy. The function was working great until one day I started to get an error with ...
2
votes
1answer
75 views

Removing commands used before loading package

Original Question: I used the convert command before loading the Units package. Convert[20000. Feet, Mile] Since Convert ...
14
votes
1answer
261 views

Potential pollution of Global` context in fresh kernel

Bug introduced in 10.0.0 and fixed in 10.0.1 If I evaluate, with a fresh kernel Names["Global`*"] I get {"rhs", "z"} ...
3
votes
0answers
32 views

Context is not clearable and does not reload [closed]

I'm just going crazy with Mathematica Contexts as they absolute do not work as intended. Simple Example: Begin["TEST`"] Hello[s_]:=s Bye[s_]:=s End[] Now using ...
14
votes
1answer
238 views

Global` context not empty at startup in v10.2.0

Bug introduced in 10.2 and persisting through 10.2 or later Note that the analysis of this problem revealed a different problem than in Potential pollution of Global` context in fresh kernel (see ...
3
votes
2answers
105 views
7
votes
2answers
135 views
9
votes
2answers
201 views

How to define UpValues in a different context from within a package

I'm trying to create a function (in a package) to import a lot of data and create a symbol with UpValues to return specific results about the data. I've got it working fine in a regular notebook, but ...
13
votes
2answers
346 views

Why does leaving and re-entering a context lose values defined in that context?

I'm getting unexpected behavior when beginning a new context, leaving it, and then re-entering it. Specifically, when re-entering the context, symbols that had been previously defined in that context ...
3
votes
0answers
37 views

Cross referencing symbols in different packages [duplicate]

I have problems with name space shadowing which I do not know how to resolve. I have two packages which depend on each other. Here is example of two files fooPackage.m: ...
11
votes
2answers
195 views

Why is a symbol still found after changing its context?

It seems that we can change the context of symbols: In[1]:= x = 1 Out[1]= 1 In[2]:= Context[x] = "foo`"; But then x is still ...
2
votes
1answer
113 views

Symbol not added to context

I have run into a problem that is currently stumping me. I'm running a WebMathematica server, and am trying to create a package to use on one of the pages. However, when I load the package, it appears ...
5
votes
0answers
50 views

How is CellContext->CellGroup supposed to work?

After reading the documentation on the subject, I still cannot get CellContext->CellGroup to work. Here's a simple example. (Unfortunately, I cannot easily ...
8
votes
2answers
714 views

How to properly handle mutual imports of multiple packages?

I'm new to the mathematica platform and I am developing a simulation framework as my first exercise and have been tearing my hair figuring how to make packages interact with each other. Ill explain a ...
5
votes
1answer
94 views

Naming conflicts with Dummy variables in several packages conflicts

I'm using several packages in a notebook. In each packages there is functions defined with dummy variables. When I load the several packages in my session, i've got a warning message: ...
0
votes
1answer
63 views

How can I use private variables in different ways

How can I use some private variables/symbols in another sub contexts in different ways. Note: Please do not use code Cell Style for testing the codes. ...
16
votes
4answers
381 views

Result about Context is inconsistent with the description of “Power Programming with Mathematica”

x = 5; temp`x = 6; Begin["temp`"] {x, Global`x, temp`x} The result in my Mathematica session is {5,5,6}, but it's ...
-5
votes
1answer
129 views

Exporting data from different notebooks to a common file

I am doing some calculations from different notebooks. I need to export the results from all those notebooks in columns of the same file, like a1 b1 c1 a2 b2 c2 a3 b3 c3 . . . where a, b ...
3
votes
2answers
97 views

Rewriting symbol context?

I have some code that uses a list of replacement rules to inject values (physical constants for different materials) into a more complicated expression. This is convenient since I can tweak the values ...
5
votes
2answers
241 views

Package Loading: How to get rid of Needs::nocont?

I am trying to create a documentated application inside FileNameJoin[{$UserBaseDirectory, "Applications"}] I obviously dont fully understand the concept of the ...
4
votes
0answers
66 views

Variable not assigned to correct Context [duplicate]

I am trying to understand Mathematica's Context, but I do not understand why the short name of the variable defined in the temp` context (x) returns the Global definition. I am following the section ...
66
votes
6answers
3k views

What is the most convenient way to read definitions of in-memory symbols when we don't have the source files? (Spelunking tools)

Note: I put Simon's implementation on GitHub. Contributions welcome! When trying to read the definition of already defined (package or built-in) symbols using ...
3
votes
1answer
95 views
9
votes
1answer
239 views

Context of localised (dynamic) symbols

When you localise a symbol with Module, the created unique symbol is usually in the current context. There seems to be an exception to this which has further ...
1
vote
0answers
117 views

NMaximize with matrix input

I defined function f[x_, fixed_] := {...}. Here x is an $M\times N$ matrix. I want to maximize $f$ with respect to $x$. I have ...
21
votes
2answers
527 views

Context unique to each group at a specified level

Are there any new tools in v10 that might be applicable to this problem? Recent versions of Mathematica provide the option of having a unique $Context for each ...
3
votes
2answers
137 views

ContextPath and autocompletion with subpackages

I'm developing a larger package which includes several subpackages. My problem is, that I can't introduce the symbols in the subpackages to the autocompletion by loading the main package, but by ...
10
votes
2answers
200 views

What are the purposes of functions in FrontEnd` context which are duplicates of those in System`?

I noticed that for notebook-related heads, there are usually a pair of same functions, one in System context, another in ...
1
vote
2answers
80 views

Set Options on a system function has effect on all notebooks

I have a Notebook A with default context: "Unique to this Notebook". In there I set an option: SetOptions[Interpolation, InterpolationOrder -> 1] This has ...
0
votes
1answer
201 views

Symbol appears in multiple contexts when load two packages with unique function names

I have two packages "packageA" and "packageB". The function names across packageA and packageB are unique. No two functions have the same name. When I issue the ...
0
votes
0answers
37 views

Is it possible to have a function with non-global parameters? [duplicate]

If I have functions in two packages that have parameters such as length_, width_ and height_; is there any way to have both packages loaded without generating messages such as "Symbol length appears ...
2
votes
1answer
71 views

Button action preventing parallel execution?

I couldn't find a better title, so I'll jump straight to the example! There is this long list of slow jobs to be executed in a parallel way, at the press of a button: ...
1
vote
0answers
95 views

Strange Behavior with Private Contexts in 10.0.1

I have noticed the following weird behavior when creating Private Context in V 10.0.1, a behavior not present in V 10.0.0. ...
8
votes
3answers
716 views

How can I make private functions inside packages

I want to make private functions.for that purpose,I wrote the following code. BeginPackage["Test1`"] Begin["`Private`"] function1[x_]:=x End[] EndPackage[] I ...
1
vote
1answer
88 views

Symbol resolution for contexts inside packages

Say I create $UserBaseDirectory/Autoload/MyPackage/init.m containing: ...
0
votes
1answer
516 views

A symbol occurs in more than one context:one of the definitions is shadowed

I started Mathematica 10 and run as the tutorial says: trainingset = {1 -> "A", 2 -> "A", 3.5 -> "B", 4 -> "B"}; c = Classify[trainingset] but the ...
15
votes
1answer
433 views

Is it possible to use Begin and End inside a Manipulate?

May be someone can explain why I can't use Begin["context`"] and End[] inside a Manipulate ...