Questions tagged [procedural-programming]
Questions about Mathematica's procedural programming paradigm.
302
questions
0
votes
0answers
31 views
-1
votes
0answers
50 views
How do I apply sow and reap in this loop? [closed]
Basically I want to make a graph about the intensity of elp over a line during a time interval.
However elp and ...
1
vote
3answers
86 views
Optimizing operations between vectors
Basically I am generating a grid in space (so a vector where v[[1]]=position 1 in x) and a random number of particles in space (so a vector where p[[1]]= position of particle 1 on space).
Afterwards, ...
1
vote
0answers
57 views
How can I make ParallelDo faster than Do?
I am trying to optimize my code as much as possible. So first I used a compile and now I am trying to parallelize the code in order to make it faster because in the end I will need to make a loop that ...
0
votes
1answer
97 views
How to use for loop in Mathematica?
in most of my job I have to repeat something for different part of data, for example making plot, usually the only thing need to change is index. Below is the example of the code which I have to ...
0
votes
0answers
35 views
Concatenate string with the value of each element of a vector/list
I have a vector/list t = {4, 5, 6}. I want to output each element (its value) of t in a string of characters. For example, the ...
1
vote
1answer
45 views
Why each iteration takes longer than previous one when using VariationalD in this loop?
I have a function $f$, and I would like to modify it iteratively to approach another one called $a$ (not because I think this is the best way to do anything, but for experimentation). For this, I use <...
2
votes
2answers
74 views
Could anyone please help with defining a vector function of tons of variables?
Could anyone please help with effectively defining a vector-valued function of tons of variables so that
...
10
votes
2answers
449 views
What is the most efficient way to define a Loop until function?
Mathematica has the While function which is very convenient when we need to process some code until the attainment of a certain state (identified with a condition). ...
0
votes
1answer
89 views
An example code for doing a loop [closed]
I would like a code that works for doing loops as in the toy example below. This would help me to understand how to work with loops in more general contexts as I am still a beginner in Mathematica. ...
0
votes
1answer
68 views
Parallelization in While[] loop when testing if a condition is met
Well, I am trying to run the following code:
...
3
votes
3answers
131 views
Do loop so that I do not get double terms?
I have a Do loop where I generate quantum state equations <111||111>,<111||112>...<232||232>. This is 144 equations in total but I want both bra and kets to be seen as the same so ...
0
votes
0answers
65 views
The use of `NestList `
After read Michael answer, code use NestList to compute and feed in numerical integration. I want to learn this idea into my code.
In the ...
1
vote
0answers
49 views
Loops Not Working- Kernel Crashes and Values Incorrectly Updated
I haven't used Mathematica in a while so any help is very greatly appreciated.
I am trying to run a program with nested for loops that runs two function evaluations in the inner most part of the loops....
2
votes
2answers
91 views
How to realize NDSolve by NSolve with the implicit constraint equations?
Daniel post the amazing code to realize numerical integrators, I think it is useful to the kind of one-step explicit equation like x[k+1]-x[k]== constant_number. In ...
0
votes
1answer
45 views
How to compose an algorithm to create new array (based on array data), if I need a reference to an array being created, no for loop, in mathematica?
I have an array with either 1 or 0. From this, I am trying to create a new array with intervals.
I have some base interval, one step, we can say 1 second here. If there is 0, I skip, if there is 1 I ...
0
votes
0answers
51 views
How to use Mathematica to return value from for-loop [duplicate]
I tried to use Mathematica to implement random generator. The pseudo code I use is as following:
...
0
votes
1answer
41 views
Evaluation self notebook with loop
I have a large notebook with multiple sections. I would like to run the entire notebook with one variable change kquads.
At the end of the notebook, I added one loop
...
1
vote
0answers
56 views
"With" use in a (implicit) nested loop
Symbolic code:
Do[g[longcat[i,k],longcat[i,k]],{i,1,f[k]},{k,1,m}]
Longcat is loooong and occurs several times in my expression g...
4
votes
1answer
97 views
Binary permutation list code in Mathematica
Given some natural number $N$, I am interested in the set of all binary permutations of length $N$ (with the intention of storing in lists depending on how many $1$'s appear in each permutation). My ...
0
votes
0answers
56 views
matrix problem: evaluation of column values which depend on a variable
I do not use Mathematica for a long time and I have a question about a matrix problem.
I add here the code:
...
0
votes
1answer
64 views
How to clear all things inside a loop?
It happens to me a lot when I write a loop, I have to Clear all functions, variables, definitions and etc to be sure my calculations is done correctly. namely as a ...
2
votes
0answers
82 views
Building a Matrix as a piecewise-function of the indices without for loops [closed]
I'm very new to Mathematica and this site. I've read that building matrices with For loops is slow, and I have experienced this myself on the current project. I'm trying to wrap my head around ...
2
votes
2answers
95 views
How to implement If criteria for the NestList-Function
I have a function which bisects a list in two parts recursively. Unfortunately I have to select a number of iterations for the NesList-function which is just an ...
0
votes
3answers
335 views
Python recursive bisection algorithm to Mathematica
I've been sitting on this problem for a while and i am kind of stuck. I am pretty new to Mathematica and have been trying to implement a recusive Algorithm, which splits/bisects a list of items in ...
2
votes
1answer
127 views
Cannot assign variable value inside Do Loop
This is more of a conceptual problem.
Suppose I have three lists.
x1 = {1, 2, 9, 10};
x2 = {5, 6, 7};
x3 = {9, 10, 13};
Now, I wish to keep only the first two ...
1
vote
1answer
44 views
Increment FindMinimum range
I have a function SQ[b,zQ,zh] where I want to find at which zQ it is a minimum. The parameters are ...
0
votes
0answers
54 views
view linebreak symbol
As you see in the above example, In[294] and In[295] looks just the same, but the outputs are different.
The fact is that there is no linebreak symbol in In[294], but there is one linebreak symbol in ...
2
votes
2answers
265 views
0
votes
1answer
30 views
How to create ParallelDo loop with n dimensions of evaluation?
For example if I have n=2 i get
ParallelDo[something, {v[1], c[1]}, {v[2], c[2]}]
and if I have n=3 I get
...
0
votes
0answers
43 views
Check an input matrix M contains any nonzero diagonal matrix element or not
Is there a way to easily check an input matrix M contains any nonzero diagonal matrix element or not?
For example,
if the M contains any nonzero diagonal matrix element, Output: True.
if the M ...
-1
votes
1answer
72 views
Costly function inside nested Modules [closed]
The function initDataTable simply reset all data to Black first, then set the bottom right quarter to ...
2
votes
2answers
63 views
How can I store vectors in a matrix
I am triying to generate realizations of a Gaussian random process using the KL expansion. For that, I need to multiply an eigenvector for an eigenvalue and a random variable.
I have tried
...
1
vote
1answer
109 views
Repeating and Sequencing Procedures with two Do-loops
I have a Do loop where I'm looking for the value of certain parameters that respect the conditions inside an If, and with those values, a run another Do to make another calculation of an expression ...
1
vote
1answer
44 views
How to get a loop for a differential equation system?
I would like to know how can I obtained a loop of this system
...
0
votes
0answers
48 views
Replacing the print display in a for loop
I am running a For loop as follows:
table = {};
For[n = 0, n < 10, n++, {table = Append[table, n], Print[table]}]
I was wondering if there was a convenient way ...
2
votes
1answer
63 views
-3
votes
2answers
89 views
How to change a Do loop to a For loop? [closed]
I'm a rookie in the loops. I would like to use a For loop to get a solution like using a Do loop.
...
1
vote
1answer
72 views
How to change a Do loop to a while loop?
I'm a rookie in the loops. I would like to use a While loop to get a solution like using a Do loop.
...
1
vote
1answer
56 views
Assiging Plot Range to Variables Works For X but Not Theta
Observe the following Mathematica code:
...
0
votes
2answers
48 views
Create list of functions, domains, and iterate over (compare to Python code)
In Mathematica, I want to do a mass export of many different animated plots of specific functions with different domains. Because I don't necessarily want the plots to always have exactly the same ...
4
votes
1answer
222 views
how can i get the following figure using the for loop
how can i get the following figure using the for loop.
n=5
For[i=1,i<5,i++,For[j=1,j<n,j++,A=(i+j)]]
A//MatrixForm
The code I found is above but not working....
2
votes
1answer
50 views
Build a list from events
Say I have a list of elements of type
{name, direction, time}
where direction can be in or <...
2
votes
1answer
40 views
Skip time taking loop values to take input next value after certain time
I am fitting using NonlinearModelFit, where I am trying to input guess values for parameters (g and xp1) from the for a loop. For a certain value of g or xp1, the loop takes infinitely long to compute ...
2
votes
1answer
112 views
Generating a lattice by $𝑁^{𝑡ℎ}$ iteration of unit cell
This question is in continuation of the my previous question that was not clearly presented by me at all.
I have a unit cell, and I would like to generate a lattice but in iterative order.
For ...
1
vote
0answers
81 views
Generate piecewise function using for loop
I want to specify a piecewise function by writing f[x_]:=Piecewise[piecewiseComponents], and use a loop to specify the components. I have tried
...
6
votes
1answer
56 views
Automatically set x=0, after each input/output ? ($AfterEachInputOutput)
Is it possible to do something that I want, after each input/output automatically and silently?
I am looking for a feature like $AfterEachInputOutput in the following code :
Example : to set variable ...
4
votes
2answers
227 views
Large matrix inversion
I'm still learning Mathematica, and I'm trying to write a program that needs to invert a large (nxn, n=160 or possibly larger than this) matrix with numerical entries, multiply with to another matrix, ...
0
votes
1answer
50 views
Draw specific polynomial with given roots by reading roots from txt file
i am new to mathimathica and i just can do basic things with it. i have a file.txt that contains roots of two polynomials $p(x),q(x)$. both polynomials have the same degre and first n numbers are ...
2
votes
0answers
61 views
Can I parallelize this function?
Can I and should I parallelize this function ? my aim is to have faster calculations
below is a toy function in which I kept the structure of the real function I am using. It uses ...
