# Questions tagged [procedural-programming]

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### 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 ...
100 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 ...
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### How to get a loop for a differential equation system?

I would like to know how can I obtained a loop of this system ...
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### 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 ...
60 views

### Matrix or loops or any ideas for help me

I have input data as below: ...
82 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. ...
66 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. ...
55 views

### Assiging Plot Range to Variables Works For X but Not Theta

Observe the following Mathematica code: ...
41 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 ...
219 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....
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### Build a list from events

Say I have a list of elements of type {name, direction, time} where direction can be in or <...
29 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 ...
106 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 ...
52 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 ...
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### 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, ...
48 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 ...
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### 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 ...
39 views

### How to change numbers in variables defined with a loop?

I am trying to change the number which is part of the variable name with a loop. What I want to changue is the following: ...
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### Generating a $N^{th}$ iterative line graph from the adjacency matrix $M$. How to generate $M$?

I have a unit cell, and I would like to generate a lattice but in iterative order. For instance, consider the following example-- The unit cell is (zero iteration) This figure is generated by a ...
107 views

### Can one make `Do'-Loops of arbitrary depth?

In the documentation for the Do[...] function, a loop of nesting up to any number of layers is supported. But to apply their function, one needs to know ahead of time how many layers of loops they're ...
88 views

### Superimposed data on top of each other in a Do Loop

If I have 4 different types of data such (that I get from an Excel file) as: https://pastebin.com/j3Bgfxqm I am trying to implement a ...
50 views

### Slow evaluation of derivative of Solution of NDSolve

I need to perform a Fourier Transform on the results of a ParametricNDSolve function as well as on the derivative of one of the coefficients. Now I do this by ...
137 views

### Functional realisation of do-loop

I'm currently optimising my code and I'm using a lot of loops, so I was wondering if there is a smarter or faster way to do things like: ...
127 views

### Strange indexing behavior by Table

Maybe I do not understand how Table works, but I find this very confusing and it took me a long time to debug because this was part of a much more complicated routine. I am trying to build an array ...
72 views

### What is wrong with my code for implementing PSOR (Projected Successive Over Relaxation)? [closed]

I have written the numerical scheme of PSOR (Projected Successive Over Relaxation) method of a obstacle program in 1D, which is as follows: \begin{align*} &u_0=u_N=0\\ &u_i^{k+\frac{...
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### Two different variables in a Do Loop

I am trying to use the code developed by @Alex Trounev here: Numerical solution of an iterative equation for different kind of q. I am not sure how to incorporate ...
258 views

### Check if rows and columns of matrices have more than one non-zero element?

I am given a list of square matrices (with non numeric entries but abstract symbols which are assumed to take real values) and I want to write a function that returns True if the following condition ...
71 views

### Using condition for each element of a matrix

I'm trying to write a code so that for each element of matrix C2 if the element i,j is equal to element j,i and it is equal to 1 then it adds one to a variable and if not it adds one to another ...
408 views

### Implementing Newton's Method?

For an assignment, I have to implement Newton's method using Module and a For loop. So far, I have ...
118 views

### How do I integrate a For loop to generate iterations of the Sierpinski's Triangle?

I'm sorry if this is a basic question—I don't know anything about programming. I know you can create a graphic of Sierpinski's Triangle with a single command, but I'd like to know how to create one ...
81 views

### Use of ParallelDo with an iterative or recursive calculation

Is it possible to use ParallelDo (or any similar parallelization method) to speed up the calculation of an iterative calculation, which takes a previous calculation ...
58 views

### Nested operations in Lists as a function of the times it is applied

I have a fixed list labels = Table[i,{i,k}] for some fixed $k$. There is a way of picking some sulists of this list with some property that I am interested in. I ...
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### How can I find different areas of triangles from a list of points?

If I have a list of points such as {{1, 1}, {4, 7}, {24, 67}, ..., {17, 83}}, how can I find the area of triangles formed by different combinations of these points? ...
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### Find the roots of a list of derivatives

I want to be able to take a polynomial and take the 1st 5 derivatives, then add at least one root of each derivative to a list using a loop. However, each attempt I try only ends up outputting the ...
48 views

### Getting error messages form Set while trying to implement the bisection method with a For-loop [duplicate]

My objective is to build a function using modules that runs the bisection method. I have a working bisection method but when I try to implement it as a module I keep getting this error and I can't ...
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### Code breaks as soon as I try to print a variable

Edit I think I figured out what was wrong. Since I was adding in Print[m] after I ran the loop, I had to clear my variables if I wanted to run the loop again. I ...
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### Use of a For/While loop inside another For/While loop for dual integration [closed]

Can anyone please give suggestion for using For/While loop inside For/While loop for integrating a function with respect to two variables say for- $\qquad r = (x^2 + (a/y^2))^(-1/2)$ Integration is ...
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### How to write this simple task of unimodular prime search in mathematica?

For testing a particular algorithm I found mathematica is the best way as it has all the tools I need. I am stuck in a number theory part and since I am not an expert in mathematica I do not know how ...
108 views

### How to build a tri-diagonal matrix [closed]

I have an algorithm that works for a Tri-Diagonal matrix in Mathematica, but I need a good way to build my starter matrix A. It's a 20 variable system (and will be a 200 variable system once I get it)...
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### Giving variable inside WhenEvent a value

I am defining ParametricNDSolveValue in one cell and then using this in another one to find the parameter value using bisection. For clarity, I have simplified my differential equation. In order to ...
45 views

### Problem with batch processing of images

I am having some problems with a palette I have designed to apply identical image processing to microscopy images. I would like to apply identical processing across a folder of images (representing ...
42 views

### How can I apply code that calculates one element of a list to the whole list?

I have a problem with a while loop in Mathematica. I want to run the whole list "mFromAlice" in the while loop but I dont know how to do that. It works with the first row, which is named x ...
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### Loop function for a list of codes

I have a list of codes that start with importing column D of an excel sheet which has a hyperlink. Then, the code moves onto importing the text version of the hyperlink and further proceeds with ...
51 views

### Avoiding Tables, Do and other loop construction

In my work I have a lot of cases, where I should calculate non-listable functions for a quite large number of points. To be more concrete, consider first listable function ...