Questions tagged [procedural-programming]
Questions about Mathematica's procedural programming paradigm.
182
questions
2
votes
0answers
125 views
Making cool animations of an accretion disk/planetary disk
I am trying to make an animation of an accretion disk or a planetary disk.
For example, a cool disk showing below (created by NAHKS TR'EHNL):
or in this link
Here is what I have tried so far:
step1：...
5
votes
1answer
270 views
An efficient way to evaluate this expression with deeply nested Do loops
Is there an efficient way to evaluate something like this?
...
1
vote
1answer
40 views
How to deal with procedurally generated rules and patterns?
I'm trying to procedurally generate replacement rules of the following form
...
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 ...
0
votes
1answer
42 views
Can I use StringReplace to write the number of row which I am replacing?
I have a text file which I have constructed as
...
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 ...
2
votes
1answer
49 views
Stop `(Parallel)Table` evaluation when wanted case is found
I have to go through a long list of evaluations, for which I suppose Table instead of For or ...
3
votes
1answer
206 views
While loop in a function
f[n_] := (
While[n < 10,
n = n + 1];
n
)
I am trying to learn mathematica on my own. I am trying to write a function that contains a while loop, but I ...
0
votes
1answer
55 views
For loop and predefined functions
I tried to write a function which is basically given by a for loop and some predefined functions. I checked already that all of the predefined functions are working, but somehow my for loop does not ...
0
votes
2answers
41 views
How to do loop with parameter steps [closed]
How to do loop with parameter steps
For example
I want print numbers : 1,2,4,8,16
but I don't know how to do loop
code like this doesn't work
Do[ Print[i] , {i, 1, 10, i}]
3
votes
2answers
120 views
1
vote
2answers
55 views
How can I multiply the elements of a list using loops?
{1,1,1,-2,1,2}
How acn I multiply the elements in the list using loops?
1
vote
2answers
46 views
Creating indexed lists of solutions using Do Command
Why when I perform this code am I not producing lists called roots[j], each containing 3 elements which are the roots of the equation?
When I type roots[0] for example I get roots[0] as answer ...
2
votes
1answer
100 views
How to put a loop in a loop
I am doing some work with black-scholes. As commented within my code, I need my while loop to run 100 times. I am not sure if the best way to do this is with a nested argument or placing a for loop or ...
1
vote
1answer
42 views
1
vote
1answer
51 views
Writing code to produce continued fractions
I have been trying to create a continuing fraction to help prove the theory about any rational number: a/b being able to be written as a continued fraction where the remainders found in the Euclidean ...
0
votes
0answers
50 views
Variables for multiple data files plotting using same Mathematica notebook
I am not an expert in mathematica,
I have this following code. As you see I import a text file under the name "MyPoint1", plot with "pAll" then I do some more calculation with more variables and ...
0
votes
1answer
56 views
For-loop not indexing correctly [closed]
I have a question. Why does my result start with J = 2? I write another loop but it start 1 i confused-i need help
...
4
votes
1answer
70 views
Defining list of new variables at once (in a loop?)
I have a list of solutions Subscript[x, 1][t], i = 1,...,n (n given).
I would like to use these variables to define new variables such as:
...
0
votes
0answers
119 views
Need help with ParametricNDSolveValue for ODE with two variables and Do-loop
I' m trying to solve a tricky 2-nd order ODE with
ParametricNDSolveValue for boundary conditions (BCs) y = 0 at R and ...
0
votes
1answer
61 views
Find the position of all the prime numbers up to a given number
I want Mathematica code the does what the following pseudocode does.
...
2
votes
2answers
309 views
How can I solve the Ramanujan problem by using Wolfram language? [closed]
The problem like this:
find all integers n, 1 ≤ n ≤ 10, 000 such that n is the sum of two cubes of positive integers in two different ways.
I want to solve the problem as a procedure in mathematica.
1
vote
1answer
38 views
How to solve this with Nest?
Just get {10} from code below.
jason[x_] := Module[{}, {b = 1}; b = b*Nest[# + 1 &, 1, x]; b]
jason /@ Table[i, {i, 1, 10}]
This gets it right with Do
...
3
votes
1answer
68 views
Looping routine to evaluate a recursively defined function
I'd like to do a calculation which is basically a looping routine to evaluate a recursively defined function. For example:
...
0
votes
1answer
95 views
Creating a loop that gives first value that is false/true
My question is, if there is a command/function that gives me the first value for which an expression becomes false?!
For a simulation of several rounds of the game battleships(ger. Schiffe versenken) ...
1
vote
2answers
74 views
3
votes
2answers
98 views
Extract outputs from a WHILE loop in a table format
How can I convert my multiple outputs of a while loop in a table form and save it for later use. Here is a sample code:
...
1
vote
1answer
112 views
How is the best way to integrate using loops
I'm using Mathematica, and I want to integrate a function f[wr] in wr using some method that works with a Table/Do/For in the variable wr.
I tried to use something like the Riemann's sum, to evaluate ...
1
vote
2answers
83 views
How can I plot these straight lines in a picture?
How can I plot these straight lines in a picture?
...
5
votes
7answers
318 views
How to use AppendTo in a While loop? [closed]
I am trying to code a while loop that uses AppendTo to append the loop variable to an empty list.
...
2
votes
3answers
94 views
Changing iteration variable in Do loop
I want to generate random positive hermitian matrices, I start with such a code
...
0
votes
0answers
32 views
Optimization of Do loop with multiple variables
I am pretty new to Mathematica and I would like to optimize a Do loop with multiple variables that I have.
I have three lists of three elements each, with the condition that the first element must ...
0
votes
1answer
55 views
Why do I not see any results from my For-loop? [closed]
I am sure I am missing something trivial :-( Still any help is welcome.
...
2
votes
1answer
83 views
Numerical Fredholm integration using loop
I have a code line having two Do loops, one within other. In certain situation arising within inner loop, I want the outer Do ...
1
vote
0answers
75 views
For- loop which can reuse updated values [closed]
Eout = E^x ;
For[kz = 1, kz < 4, kz++,
Print[Eout1[kz] = Eout];
Print[kz]]
The output is
E^x
1
E^x
2
E^x
3
But what ...
2
votes
1answer
56 views
how to run a specific cell in a notebook from another notebook
I have a long Mathematica code in a notebook, denoted by NB1. Since it is a very long code, and I need only some of the outputs from NB1 to be used in another ...
0
votes
0answers
52 views
What techniques have you employed to avoid loop in Mathematica? [duplicate]
It appears to me that loop in mathematica is very slow (compared with matlab). Since many people still use mathematica to finish their work, there must be some techniques to bypass this problem.
...
1
vote
1answer
87 views
For loop for two variable at the same time
Can I use for loop for two variables as example show below at the same time?
for (int x = 0, y = 0; x < 10 && y < 10; x++, y++)
0
votes
0answers
42 views
Running a complex notebook from a different master notebook?
I am trying to use the Dynamo notebook (https://www.ssc.wisc.edu/~whs/dynamo/dynamo_3S_v1.4.1.nb) in a loop over parameters. Basically, this software takes one matrix as input, solves ODEs and some ...
0
votes
0answers
49 views
Iterative loop with many steps
I want to automate the following code, let me begin by explaining the code first. This code, for representation, is divided into 3 parts. The first is:
...
0
votes
0answers
42 views
The variable in the While loop does not change
I have a simple while loop. After running, the variable does not change:
...
0
votes
1answer
52 views
Return last value of While function
I want to make a function that performs a multiplication with Inner i number of times using a ...
0
votes
1answer
59 views
Variable nesting depth inside table
I hope my title makes sense. The idea is the make a function in which a set of variables, $l_1$, $l_2$, etc. are accessible inside the innermost body of a nested (/folded) function. Each of these ...
0
votes
0answers
56 views
How can I count the number of days (Monday, Tues, etc) in a year?
I am new to Mathematica and for fun am trying some of the challenges. The one I am working on now is:
...
0
votes
2answers
120 views
0
votes
1answer
114 views
Parallelizing nested for loops
I'm currently computing nested for loops.
I count up a few counting variables and compute a value for each set of counting variables, then that value is added to an array. It is a way of adding up ...
2
votes
3answers
134 views
Evaluating number of iteration with a certain map with While
Beeing used to programming in C-like languages I am struggling with iterations and loops with mathematica. I am trying not to use the For command, as already lots of people recommended.
I am trying ...
1
vote
1answer
116 views
How do I create multiple plots from an Excel spreadsheet?
I have imported an Excel spreadsheet with dimensions {row, col}= {92, 28} into Mathematica, I want to plot 27 datasets from the spreadsheet: column 1 with column 2, column 1 with column 3, ..., column ...
0
votes
1answer
154 views
Mathematica crash every time when I run this loop [closed]
I have written a simulation for a percolation test. Then, I am using another notebook to control this simulation to generate 1000 results with a different random seed for each one of them.
The ...
2
votes
1answer
66 views
Populating function inputs from lists [closed]
I have several lists containing variables, e.g. list1={x1,x2,x3}, list2={y1,y2,y3}, etc. I would like to define a function in those variables, i.e. ...
