Questions tagged [procedural-programming]
Questions about Mathematica's procedural programming paradigm.
218
questions
2
votes
1answer
99 views
Translating pseudocode for the Jacobi algorithm into Mathematica
Here is an image for the Jacobi algorithm. I have almost no knowledge of Mathematica, the textbook does not help. Does not provide examples. The class average is 64%.
I just want to be able to ...
2
votes
3answers
175 views
Re-writing code chunk using While loop
I can't seem to wrap my head around the syntax for how to rewrite this chunk of code I have using a while loop, and would appreciate some help. I'm going through a list and am grouping the values into ...
1
vote
1answer
42 views
How to use syntax instead of double for loop
I would like to find the distance between a point list (i.e dalist) and list of centers (i.e framecenters). I used the following ...
1
vote
1answer
78 views
Question about the test format applied in a for loop
I have an issue with the following code. I am trying to remove the points which have a distance less than 2mm relative to each other starting with a specified point ...
1
vote
1answer
68 views
Issue with Do command
How can I substitute the arrays of a list to the frameCenter1 variable in the following Do loop? I used frameCenter1[[i]] but no answer.
Assume frameCenter1 can be selected from this list:
...
0
votes
1answer
69 views
Question about for loop
How can I get the results of a "for" loop for each iteration? For example, I have the following for loop and would like to know how I can get the value of S1 for each i value in the output. Also, I am ...
8
votes
3answers
652 views
How can I replace a set of Nested For Loops with a Functional Code Alternative?
Despite having looked over various posts concerning optimizing nested For loop expressions into a functional programming equivalent I still can not figure out how to actually to do this. Such ...
1
vote
2answers
77 views
How to run 1000 examples of matrices
I have two functions of matrices, let say $f(A,\,B)$ and $g(A,\,B)$, where $A,\,B$ are positive semidefinite matrices. I want to check if $f(A, B)$ is greater than $g(A,\,B)$ for any $A,\,B > 0$. I ...
3
votes
3answers
174 views
For Loop to Sum numbers in a list
I'm asked to create a For[] loop that will sum positive numbers in a list. I am unsure of how to do this.
...
2
votes
1answer
26 views
Which condition inside a loop with unknown value in a condition
I have a Which condition inside a loop such as:
...
0
votes
1answer
50 views
Do with variables from a table
I want to perform a Do command with n variables, where n is set elsewhere in my code. How do ...
-1
votes
1answer
60 views
List with not computed numbers in Do loop
If I have a a Do loop such as:
Do[
list=AppendTo[tts, otherlist]
]//Print,{j,1,10,1}
which generates a list of 10 numbers for ...
1
vote
1answer
68 views
Using a condition in a do loop
If I have the following code which was written by @creidhne here Problem using TableForm and Do loops:
...
-1
votes
1answer
84 views
Problem using TableForm and Do loops
The following code is supposed generates a table based on different calculations for a given q (e.g. q[1] for this example):
...
0
votes
1answer
45 views
Problem with Do Loop and TableForm
The following code is supposed to generate 10 tables based on different calculations for different q:
...
0
votes
2answers
41 views
Current iteration number in “do” command
How can I obtain the current iteration number of the "Do" command? For example I want $N$ to be my iteration number in the following command:
...
5
votes
2answers
157 views
Code to emulate what excel does in cells
I would like to generate a code which emulate the calculations that are being perfom in columns A and B and row 7 to 12 in the attached first image. The results of those calculations are those shown ...
0
votes
1answer
28 views
0
votes
0answers
37 views
1
vote
0answers
35 views
1
vote
1answer
74 views
General question about programing
If I have the following general excel columns, how could a create a program or loop in which I can generate what I have in column A and Column B as lists. "i" represents row number so that for ...
1
vote
1answer
36 views
Loop to match five point differentiation formula
I have a uniform grid (x,y) and I need help to generate a loop to compute (x-2h,y), (x-h,y),(x+h,y),(x+2h,y) for every point of x, and the same thing for every point of y , (x,y-2h),(x,y-h), (x,y+h), (...
-1
votes
2answers
45 views
If statement inside a for loop to find a function?
I am trying to find the value of two functions with two variables by using for loop. Then I want them to satisfy a condition and if that holds then I want to write only those sets of the variables for ...
0
votes
0answers
21 views
Conditional Loops with Random Samples
I would like to simulate the following process:
Pick a random number between 0 and 1.
Choose a final time $t_f$.
Evolve a (complicated) function $f[t]$ from $t=0$ with small timesteps $\delta t$ (the ...
0
votes
0answers
24 views
Access a variable outside a loop
If the variable "avrami1" is a column with ten elements (array of 10*1), how can I access the variable "avrami1" outside the loop and get those same ten elements?
...
1
vote
0answers
53 views
Implements the binary-searching style code in functional way
Given that I have a code snippet written in binary-searching way:
...
0
votes
0answers
52 views
How can I modify the code to speed up the `Do`?
I need to use the following code to do some calculations. But the running speed of this code is too slow. How can I modify this code to improve the running speed?
...
0
votes
1answer
36 views
Load multiple csv files and do iterative calculation for each file
I am trying to read multiple csv files and want to plot them all together,
Lets say I have 3 files, file1 , file2 and file3
I want to average 3 files, and plot them all together,
So far I have set ...
6
votes
3answers
508 views
How to terminate a loop when the length of a list reaches a certain length?
If I start out with a list A with $n$ elements in it, how do I append elements to it until it has a length $N$?
For example if ...
1
vote
0answers
29 views
Error while exporting multiple files
I have two questions. I am trying to export results from my calculation when I iterate. I am processing multiple files using code below:
...
1
vote
1answer
30 views
Can I sample from a distribution whose parameters depend on the current iteration?
Let's say I want to sample from 100 Beta distributions, and in each successive one, the first parameter increases by 1. So given a current iteration number n, I ...
2
votes
1answer
33 views
Get all step values from a while-loop
I did a loop (first of my life) for an iterative calculation. Is it possible to get all step values as a matrix. That means the "xValue" variable should be like {215.108,219.688,...} and not only the ...
3
votes
2answers
55 views
What's wrong with While? Is it possible to use double While in a single code input? [closed]
I am supposed to get 2 in the output, but it is still -3 instead.
...
6
votes
3answers
346 views
How do I modify a symmetric matrix while maintaining symmetry?
I'm trying to figure out how to create a For loop for a symmetric matrix. I have a 5 $ \times $ 5 symmetric matrix consisting of 1's and 0's and I'm trying to ...
2
votes
1answer
437 views
Implementing “do this, then return that” in function definitions
In Python, I often use local variables in defining functions, like so:
def f(x):
k = initialk
< 'do something to k' >
return(k)
I would like to do ...
2
votes
1answer
34 views
Getting general::write error while making list in for loop [closed]
So I solved following ODE $$\frac{d^2y}{dx^2}+(a^2 (5+4\tanh( x))+b^2)y=0$$ in Mathematica. Now I need to create a list for further manipulation using the above solution. I wrote the following code:
<...
3
votes
1answer
31 views
More efficiently access iterator values in subkernels?
I'm looking for more efficient ways of observing values in loops in subkernels. For example, take a standard Do loop:
...
3
votes
2answers
908 views
Improve speed with a double for loop
I am trying to calculate the Euclidean distance of pairs of points $(x_i,y_i)$ with $x$ and $y$ given as separate lists.
...
5
votes
1answer
283 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
44 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
40 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
44 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
54 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
58 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
239 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
60 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
46 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
121 views
1
vote
2answers
60 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
49 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 ...
