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### Assigning value to an array in nested for loop [duplicate]

I want to write a code like X={}; index=1; max=3; For[i=1,i<=2,i++, For[j=1,j<=2,j++, X[[index]]=i*j; index++ ] ] But I am not getting ...
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### An elementary question about For loop [duplicate]

Assume we have this For loop: For[i=1,i<10,i++, i^2]. How can we put the squared values ...
98k views

### What are the most common pitfalls awaiting new users?

As you may already know, Mathematica is a wonderful piece of software. However, it has a few characteristics that tend to confuse new (and sometimes not-so-new) users. That can be clearly seen from ...
39k views

### Alternatives to procedural loops and iterating over lists in Mathematica

While there are some cases where a For loop might be reasonable, it's a general mantra – one I subscribe to myself – that "if you are using a ...
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### Can this be written well, without loops?

Inspired by this question I would like to know if the following code can be written without explicit loops (For, While, etc.) in a clean, efficient and non-contrived way. I have been unable to do so. ...
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### Are there any cases when For[] loops are reasonable?

To my mind the only reason for the existence of For[] loops in Mathematica is to allow new users with some experience in procedural programming languages to write ...
525 views

### Finding C[i]'s expression in DSolve solution

An example, the command DSolve[y''[x] - 4 y[x] == 1, y[x], x] gives solution ...
644 views

### Optimizing Mathematica Code

I have implemented the whole Baum-Welch Algorithm for training Hidden Markov Models as described in Rabiner's paper Here is my code that calculates the Forward Probabilities ...
968 views

### How to speed up a process

I am wondering how to speed up the following code: Currently it takes more than two sec to be processed. ...
334 views

### Computing only Prime Powers with NestList

Is there a simple way to compute only prime powers of a function f with NestList? That is, I want to compute: {f[x_0], f^2[x_0]=f[f[x_0]], f^3[x_0], f^5[x_0]...} ...
466 views

### An efficient way to translate a triple for-loop from Matlab to Mathematica

This is my first post on StackExchange, so if I violate any etiquettes, I apologize in advance. I am a senior engineering student who has been using Mathematica for a year now. For one of my classes, ...
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### CUDA image processing

I am having an issue with image processing involving CUDALink. ...
703 views

### For Loop and Sum

I am requested to do a sum of the first fifty positive even numbers by using For loop. The For loop that I created is ...
252 views

### Is there a way to create ZIP OutputStream ?

I want to write data to a file using compression. Is it possible to do that just in time (like in java ZipOutputStream). E.g. what I want: ...
489 views

### Pascal records and Mathematica programming

Background: "experienced" Pascal-programmer (DOS-era, never got into OOP) proud owner of Mathematica ver 11.2 have used Mathematica for years to do my share of number crunching and plotting to ...
503 views

### Why does NDSolve fail to solve the PDEs and spit out mconly warning?

I try to solve two coupled PDEs with NDSolve using the following code: Set two operators: ...
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### Selecting elements from a list of lists [closed]

Being a novice, I'm having trouble with the following: I have a list of lists and want only those elements where the second element of the second level is positive. So, for example, from ...
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### How can i change some numbers in a list?

I do not want to change all of them just some of them in particular rule. For example the list is given a={1,2,3,4,5,6,7,8,9....,100} If the number is bigger than ...
404 views

### Random walk in one dimension — meeting of two particles

I'm new to Mathematica and still teaching all by myself, hope you bear with me. I have the code: ...
460 views

### For/ Do loop on a lists of two variables

I am trying to get an output of the following kind Out = Do[Evaluate[f[x,y]],{x,table1},{y,table2}] Here Out is a N-times-1 dimensional array/list and N is the ...
344 views

### Dot products and For-loops

I'm taking a class where we're working with matrix applications inside of Mathematica. In this case, we're analyzing senatorial votes that have been numericized so that a value of 1 corresponds to "...
251 views

### How do I write this matrix?

The following code gives 20 data as output. How can I make a 5*4 matrix by that data list?
131 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 ...
686 views

### Find simultaneous roots of Sin[x] and Cos[x] using FindRoot, If, and For

I am a beginner of Mathematica, I happened to come across the following exercise which may seem trivial to the experts of this field but is hard for me to do at this level. I have the equation ...
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### Multiple file export

Here my code is running fine.In this code I put x=1 but I want to run x from 1 to 100 and for each value of x I want to export the excel file by the name according to x value.like for x=1 it export by ...
101 views

### Exporting result of calculation to file at each step of iterative routine

I am performing a calculation that involves a triple "For" command. My goal is to export the table of all values of some function (which depends on the three indices) to a data file for statistical ...
87 views

### For loop not working as expected from a C programmer's perspective [closed]

Why does Print[n] produce output inside a For loop, while Sqrt[n] (as well as many other ...
139 views

### Nested For loops simplified

In order to avoid a deep set of nested For loops, I came up with this method to do it with one For loop. The range of each level's For loop counting variable k1, k2, k3,... is 0 to b, and n is the ...
100 views

### How can I combine the output of a For` loop into a list?

I am currently writing on a code to get RandomNumbers which are geometrical distributed. But i need the output in one list because i want to plot the output Can anyone help me? Here is the current ...
90 views

### Speeding up code for (0,1) Matrix and Calculating Recurrent Rate (RQA analyses)

I am trying for several days make this code faster. The function just takes a time series makes a Distance matrix of it and then compares components of it with Variance of that series and if component ...
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### Is there any way to save time using of “Cross” or “Table”?

I need to solve a equation by NDSlove, so I write the equation first, but it takes me a lot of time. The follow is my code ...
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### How to display a True/False table [closed]

Below is my written program ...
72 views

### Error in Assignment

I want to create a matrix with each element updated as per the formula, whose inputs are dependent on the location of element in the matrix. ...
139 views

### loops in one loop, [closed]

I'm new Mathematica user. I try for loop but it didnt work. I used ...
46 views

### Expressing values from an evaluated If function as a list

For[i = 0, i < 4, i++, Print[i]] gives the result: 0 1 2 3 by the definition of the If[] function. Given a much longer ...
96 views

### FindInstance nonconstant parameter

I am trying to solve multiple instances of the same problem using FindInstance. ...