Questions tagged [scoping]
Questions on Mathematica's scoping constructs (Block, Module, With, etc.)
418
questions
3
votes
1answer
61 views
ReplaceAll Wierdness
I've come across some weirdness in ReplaceAll. Replacement works fine outside of a module, but inside the module some replacements don't occur where one might expect them to.
...
0
votes
1answer
35 views
How to use module to assign functions to a set of imported text files?
I have a lot of text files in my folder (in this example I'm using only 8). I am trying to import all of them and then do calculation on each individual file; I want to use the same notebook without ...
1
vote
0answers
60 views
How to iterate a function
I have written a custom function called f1[r_] and I have tried iterating this function using Table. I work nicely for the first ...
0
votes
0answers
53 views
help with improving my code
I am fairly new to MMA-12 and have written the following code to calculate possible coordinates (for given constraints [see If[]] in the code) and get the ...
1
vote
1answer
41 views
NDSolve with Events that reevaluate with different Discrete Variables
I have the following problem:
I have a set of ODEs and some discrete variables which I can solve successfully. Now I want mathematica to check at every $0.1 \,t$ time step, wether it would increase ...
4
votes
3answers
84 views
Is it possible to use a previously defined value in subsequent definitions of a `Block`?
Is it possible to use a previously defined value in subsequent definitions of a Block?
According to syntax coloration, this should work as expected, that is, ...
0
votes
2answers
54 views
How to keep symbol bindings local to a Notebook section?
I'm using the Notebook on Wolfram-Cloud as a ... well ... notebook to keep notes about the topic I'm studying and to answer exercises. I usually keep one notebook file per chapter, with course notes ...
2
votes
0answers
41 views
Does passing patterns between packages alter their name unbeknownst to the user? [duplicate]
This question is a partial followup to my previous question.
Mainly, after using With to inject the proper argument in the function at the rhs of ...
1
vote
1answer
47 views
How can I make parameters set by an array of buttons known to other quantities in my model?
With help from @m_goldberg, I developed the following model:
...
2
votes
1answer
59 views
Handling a list of variable assignments to be used with `With` [duplicate]
Is there a way to use With as follows?
variables := {a = 2, b = 3};
With[variables, a^b]
Desired output
...
0
votes
0answers
35 views
Mathematica Function Taxicab Numbers [duplicate]
I have spent days trying to compile this code and I cannot generate a list of taxicab numbers for the Hardy-Ramanujan Theory. Here is the module I wrote earlier:
...
0
votes
0answers
20 views
Referencing a control from within a module
Below is a simple Manipulate that references a module via a button, which resets a slider and value.
I would like to reference and reset the slider control for the
slider "n" from within the module "...
0
votes
0answers
35 views
Problem in solving a trancedental equation which is embedded in module
I have written a small program to compute the resonance frequency, for that I am solving a transcendental equation, which comes from the determinant of the matrix ...
2
votes
2answers
51 views
Turning an equation into a function in a module
I have defined a function like this:
f[q_] := Module[{g},
g[x_] := Evaluate[q];
...
]
I am calling the function like this:
...
0
votes
1answer
35 views
For different value of input module is giving same result
I have a simple module written to extract a certain shape for a certain value of ω, but I am getting the same result for different input values into the module.
1.mode[1] and mode[2] looks exactly ...
10
votes
1answer
123 views
Memory leak with FindMaximum/Minimum inside of Module
This is my first question here. I have to solve coupled first order ODE-s and find the maximum of a function which depends on the solution of the ODE. I have to do this calculation in large quantities,...
0
votes
0answers
53 views
Is it possible to create complicated packages from modules which work fine by copy paste? — A counterexample [duplicate]
Here is a module which constructs essentially several functions in a chain [Phi], sct, ks, WE, G:
...
-1
votes
1answer
71 views
Facing error while solving a determinants with the use of NSolve inside module
I have written a small program to find the natural frequencies of some system using an energy approach. v1 and t1 are the potentials and kinetic energy of the beam. v2 and t2 are the potentials and ...
1
vote
0answers
105 views
Transferring a function between two modules in a package
I have a first module which outputs as forth output a function G I want to transfer to another module. The specific function is
...
1
vote
2answers
82 views
Sum of n sums, Permutations of the indices, how to write them in Mathematica?
I was wondering how to write a function $ F (r, q, n, f) $ in Mathematica, defined in this way:
$$F(r,q,n,f):=\sum_{i_0=1}^q f(i_0) \Biggl(\sum_{i_1=i_0+1}^{q+1} f(i_1)\biggl(\sum_{i_2=i_1+1}^{q+2} ...
0
votes
0answers
31 views
Can I still use global variables when I choose the default context to be the cell group?
To avoid accidentally reuse the same variables in different sections of my notebook, I go to Evaluation menu and choose Notebook's default context > Unique to each cell group.
But sometimes I do want ...
4
votes
1answer
126 views
Best practice with Return in Module or Block
I am a bit confused on the use of Return in either Block or Module when defining a custom ...
8
votes
2answers
163 views
Using `With[…]` with a list specification as a variable [duplicate]
If you have some defined function, say f[a_, b_ c_, x], one can initialize this by using With[...] as
...
3
votes
2answers
74 views
Scoping construct for dependent constants
I sometimes want to write a function which needs to apply a bunch of transformations that are not functions of a single parameter only:
...
3
votes
1answer
118 views
function evaluation - I don't get it
this function returns Pi/4 for a[1,4]
In[...]:= a[r_, n_] :=
Module[{an = Pi/n, h = r Cos[an], w = 2 r Sin[an]}, an];
a[1, 4]
Out[...]= Pi/4
so the kernel ...
5
votes
1answer
112 views
why DSolve in V 12 returned an internal module variables with $ on them in this example?
Fyi, Reported to WRI in case it is a bug. [CASE:4288939]
Is this supposed to happen?
...
0
votes
0answers
26 views
Why are unrelated symbols localized in Module? [duplicate]
As I understand, an expression like Module[{var},expr[var]] localizes var and evaluates ...
1
vote
1answer
100 views
How to use Module function?
Here is my issue; I want to iterate a fit to this data for a polynomial of degree 2 up till degree 6. However, at each iteration I drop certain data points that have a poor residual value. So each ...
0
votes
1answer
46 views
Modifying/optimizing a double sum with an If condition
I would like to better understand double summations where one of the sums depends on the upper limit of the previous sum. This appears frequently in representation theory (to the extent of my ...
1
vote
1answer
53 views
Variables referring to other variables within Module
The following doesn't work:
Lol[x_, y_] = Module[ {w=x+1, z = w + 1}, z]
because z refers to ...
1
vote
1answer
61 views
Using rules inside Module or Block
I have a rather long piece of code inside a Module, and I want to provide different parameters to the different pieces inside the ...
0
votes
1answer
63 views
0
votes
0answers
25 views
Gradient method in vectorfield on surface table does not work, module is slow
For teaching purposes I want to generate a vectorfield on a surface an visualize the path of the gradient method.
The surface and the gradient are generated by
...
10
votes
4answers
574 views
What is the accessibility of a package's `Private` context variables?
I've been reading up on how Mathematica handles contexts, $Context, $ContextPath, and a few of the tutorials they have on ...
6
votes
1answer
119 views
RegionPlot3D no longer localizes its arguments?
Bug introduced after 9, fixed in 12.0.
Just now, I was astonished to find the behavior of RegionPlot3D changes somewhere after v9 . Consider the following sample:
...
3
votes
1answer
90 views
How to trace value assigned to local variable(variables in Module)?
Bug introduced in v10.1 or earlier and persists through v11.3
CASE:4240757
Here is my code:
...
0
votes
0answers
55 views
Assigning values to variables inside Module using user defined function
Say I'm defining a function
with some local variables, for which I'm using Module. Now, I want to assign some value (or perhaps a list of values or a list of list, ...
1
vote
1answer
147 views
Why are there local variable conflicts in my recursive function definition?
Sorry to post a long piece of code. There are two places in here where I Print[] 'path2' when the count == 984, because for some reason, that list is getting ...
0
votes
1answer
75 views
Different result in ContourPlot function using different version of Mathematica (?)
I tested "Elasticity with Mathematica" notebook (Mathematica 6) in Mathematica 11.3 and tested C05_stress_kirsch.nb, I added some trigger code to protected function in the tensor2analysis.m file, and ...
2
votes
0answers
28 views
1
vote
0answers
46 views
Why doesn't `ReplaceAll` work in this situation? [closed]
I can work around this by using With, but it seems really odd to get the following:
...
0
votes
1answer
97 views
Multiple functions within a Module
I have a function that extracts a numerical value from two vectors, written as Spa[i_,j_]:=Flatten[LaU[i].LaD[j]][[1]]. (Note, I'm sure that this isn't the most ...
1
vote
0answers
54 views
Function returned from module doesn't work [closed]
I have a sequence of steps that work in the main notebook:
...
3
votes
2answers
186 views
Finding the inverse of a function
I am to solve for $r(\rho)$ given the function,
ρAsymp[r_, b_, q_] :=
1/(1 - q) Gamma[1/(1 - q)]/Gamma[(q - 2)/(q - 1)] r Sqrt[1 - (b/r)^(1 - q)]
This can be ...
1
vote
1answer
33 views
Evaluation of Extract and use the result in a Sum
I am experiencing a problem in the evaluation of a sum. I hope that someone can help me, I am not an expert Mathematica programmer. I'm posting just the portion of code that gives problems, I know ...
4
votes
2answers
154 views
Scoping of pattern variables [duplicate]
I have run into a problematic behavior, and then came to find that it is a "possible issue" called out in the documentation, but I guess I am just baffled that this IS an issue, and am wondering why. ...
0
votes
1answer
133 views
Can I bake my own PI using your Wolfram language oven and prebuilt utensils? [closed]
How might I override the value of the Greek letter PI within various builtin language functions in the Wolfram language? Specifically and without having to reinvent the wheel or code equivalent ...
2
votes
1answer
88 views
How to define a function inside a module through Evaluate [duplicate]
I am trying to define a function inside a module as following
...
0
votes
0answers
47 views
Symbol created in Module not seen outside of Module scope [duplicate]
I am using a function defined with a Module[]. In the Module I am creating a new variable name using a ...
1
vote
0answers
55 views
ConditionalExpression still resulting from Assuming a Module's local variables
I have a memoizing, recursive function whose MWE looks like this (the two fake inputs/ICs are from 'K' and 'Bfun2', the latter just a quick way to check the results coming out of the Residue.:
...
