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Questions tagged [scoping]

Questions on Mathematica's scoping constructs (Block, Module, With, etc.)

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0answers
59 views

Output Changing when calling Block twice

I'm trying to optimize my code a bit, and I'm having some issues with block. Here's the block ...
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1answer
119 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 ...
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1answer
38 views

How to define a function inside a module through Evaluate [duplicate]

I am trying to define a function inside a module as following ...
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0answers
44 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 ...
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0answers
45 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.: ...
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2answers
77 views

How do I localize changes to a variable inside a Do-loop?

I want to change the increment value inside the do loop . But i dont know why it remains for the first declared value? ...
3
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3answers
90 views

MostOccuringWeekdays Wolfram Challenge [closed]

I am working this challenge from Wolfram Challenge. I believe that I have solved the problem with the following code (note it is not very efficient - I am new to Mathematica!) ...
2
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1answer
40 views

Module - Symbols out of scope of lexical scoping

The Problem Consider the following code (1): In[1]:= x = 2; Module[{x, y}, y[x_] = x; y[1] ] Out[2]= 2 I expected the answer ...
3
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3answers
213 views

What is wrong with Module? or me? [closed]

The following code does not give me an answer. It looks all is working when each command inside Module is individually run. But ...
2
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1answer
36 views

Why does Mathematica stay on an endless evaluating loop with Manipulate?

I have built Manipulate to see the impact of a change in time and volatility to the profit of an option strategy, bull spread. To calculate the price of the option, I built the good old Black-Scholes: ...
5
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1answer
104 views

With vs. Block scoping of parameters for Plot

A very basic question.. Why does Block work, but not With, to specify value of a parameter for a function to be plotted? ...
4
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2answers
64 views

HoldAll Attributes and Delayed Evaluation: ContourPlot with solutions to NDSolve

This is a general question on evaluating functions that are defined to be evaluated with delay. In particular, I am having difficulties working with the ...
1
vote
3answers
57 views

Prime number counting function

As part of an assignment for a calculus class, I have to write code for the prime number counting function $p(n)$, I have no problem creating the function itself, but for I want it as a function, ...
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0answers
61 views

Nested rules and automatic renaming of variables [duplicate]

I understand why $ happens here: ClearAll[foo] foo[a_] := (x_ :> a x) foo[1] ...
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0answers
36 views

K vs k in a module

Module[{K = 1, fn}, fn[p_] := Print[K]; ParallelTable[fn[p0], {p0, 2}]]; Prints K$316 (or whatever the module counter is on)...
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0answers
45 views

What use is empty binding list in `Block[{},…]`? [duplicate]

Spelunking the Export function, I stumbled upon the following definition: ...
1
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1answer
53 views

Problem passing argument in hash table from global context to a module

I was experimenting with passing arguments via a hash table to a module. Found a very strange result. When I pass a function to be plotted inside the module, it comes out empty. Yet all argument ...
2
votes
1answer
58 views

Module and With do not work in some cases

I apologize if the title is too vague/general but I couldn't find a better one. I am trying to use either Module or With but it does not work if the object containing the local variables is defined ...
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0answers
88 views

A bug in Derivative?

Check this out: ...
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1answer
61 views

Want help with debugging a For-loop

I'm trying to run a simulation, which at the end gives a value 'qber'. Now I want to run this simulation multiple times with different values of 'p' each time. And these value of 'p' are actually the ...
2
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2answers
80 views

Clear variables inside Module

I have a function that uses Module. The function takes as input a .csv that can have as many columns as it wishes to, and it ...
5
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4answers
208 views

Create rule whose LHS is already defined

My question will be clearest if defined using an example. Consider the following code: Func[k_]:=Block[{a}, a[t_]:=t^k; {a[t]->a[t]} ]; However, calling ...
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0answers
44 views

Dependent variables in With operator [duplicate]

I want write something like this With[{x=1, y=x+1}, y] and get 2 as an answer. What is the correct way to do this?
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0answers
29 views

How to speed up a module function with a large number of arguments?

I'm setting up a fairly hefty numerical code dealing with matrices of variable dimension, but on the order of hundreds of rows and columns. I'm using a Module format: ...
1
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2answers
91 views

function fails to use local variable when it is called inside a Module

I have these two functions fun and microstep.Fun makes use of a Module construct within which I define the ...
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0answers
51 views

Iterating a Module

I have a Module that can act on other Modules, which is given as Kk[EE,p,z1,z2,z3,K_func] and I am trying to iterate it, such that ...
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0answers
16 views

How to define a global function dependent on a local pattern? [duplicate]

When g is in the local scope defined by Block, the following fails: ...
2
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2answers
37 views

Table and evaluation order

I thought Table should not evaluate the inner code until it inserts the value. I'm confused by test1[3]="a"; test2[4]="b"; Table[DownValues[i],{i,{test1,test2}}] ...
1
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1answer
46 views

Manipulating definitions while reading them with Get

In order to read in a definition with certain parameters replaced by appropriate values I can use for example Block[{a=1.1,b=2.2}, Get["file"]] where ...
2
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3answers
228 views

Use of Module With Functions

Really confused by how one should use the Module[] command in two variables. For example my function here should return the ...
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0answers
26 views

Tracking System function (Get) calls, and Stack[_]

Consider the following attempt and variations thereof to track (nested) calls to Get (reasoning of this approach below): ...
3
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1answer
82 views

ThrowAway Environment and Scoping

I want to be able to Get a .wl file. Run some functions (who will do their job working on some separate files that are being written away). And then return to some clean slate so that I can repeat ...
0
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1answer
26 views

Issues with Manipulate and dynamic variables in plotting [duplicate]

I'm trying to make a manipulate that shows a parametric plot of a cycloid with manipulators that affect the shape of the curve. My problem seems to be my scoping of the variable ...
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0answers
37 views

Imitate Integrate's behavior with regard to the integrand parameter (scoping/naming)

Using Integrate, I can do any of the following: ...
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1answer
173 views

Using Random walk on a region [duplicate]

I want to simulate a random walk on two dimension equation using module. Checked the input so the path works ...
3
votes
1answer
68 views

Variable scoping confusion

Forgive me if this question has been asked prior (I wouldn't even know where to start looking for an answer to this problem to be honest). I know the following code in Mathematica works: ...
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0answers
25 views

Defining functions while evaluating a module

This might be a very basic question, so apologies in advance, but I couldn't find a direct solution. Suppose I have a module that takes function(s) and expression(s) as its arguments. For the sake ...
3
votes
1answer
78 views

When does Slot evaluate?

I looked up the related answers, it must have to do with the scope. Toy example similar to mine in structure: ...
2
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1answer
35 views

Why is the variable x not locally scope in the StringExpression?

Clear[x] StringCases["abcadcacb","a"~~x_~~"c"->x] {b,d} ...
2
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1answer
84 views

Converting strings to expressions in a package

I have a function that generates an equation in the form of a String. I want to be able to turn that string into an Expression, and evaluate it in another function. For example: ...
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0answers
37 views

How to define a symbollic matrix with variables and numbers

Newbie here. I want to define a (user-defined)function to return symmetric matrices, as I need to define quite a few tensors. I am able to do this using strings. But I need the matrix entries to be ...
0
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1answer
50 views

Error when calculating more than 1 input

I'm trying to solve a problem where I can't do more than 1 calculation inside a Module here. I have a list of numbers where ...
0
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1answer
88 views

Declaring global variable in module/ Looping in mathematica [closed]

I'm new and still learning about mathematica. I'm having some trouble with my code. This is my current code that i'm having trouble with: ...
1
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1answer
74 views

A function which performs multiple steps

I'm trying to figure out how I can define a function which takes an input, performs an operation on it, then produces a table from the result. For example, I have a function ...
2
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2answers
65 views

How to block list of variable that is of string form?

For example, I have varList={"a1","a2",...} a1, a2,... are all variables, they maybe ...
2
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0answers
50 views

Immediate Function Definition inside a Module [duplicate]

In mathematica, it is possible to perform immediate definition of a function where the dependent variable is not explicitly mentioned on the RHS. For example: ...
3
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2answers
135 views

Sow in WhenEvent can't extract parameter value of ParametricNDSolve

This is a problem I noticed when trying to answer this question. Just consider the following toy example: ...
4
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1answer
103 views

Using Position[] inside a Module

I have a dataset with missing or wrong values. A module should replace those values so that the dataset length is preserved. For identifying the positions to be replaced I use ...