Linked Questions

8
votes
2answers
3k views

Modifying parameters: Set::setps in the part assignment is not a symbol [duplicate]

Ok, this will probably be a silly question, but I can't get my head around it. I'm making a simple module that, given a list and two integers, will swap the position of the elements in the list.(...
8
votes
1answer
965 views

Memory not freed after running Clear when using a Table [duplicate]

When I'm creating large lists with Table I see the memory footprint increasing. ...
6
votes
5answers
268 views

On reimplementing the Select function [duplicate]

I am working through the course Programming Paradigms via Mathematica. One of the exercises asks that you construct a function that mimics Select,even with three ...
2
votes
1answer
7k views

Difference between = and := [duplicate]

I wanted to know the difference between two operators: = and := I couldn't find the ":=" operator on the list at https://reference.wolfram.com/language/tutorial/Operators.html Can someone help? ...
6
votes
1answer
619 views

Discrepancy between Matlab and Mathematica Fourier parameters [duplicate]

MATLAB and Mathematica have different FFT normalization parameters. This is easy to change in Mathematica with the FourierParameters -> argument, but anything ...
1
vote
2answers
5k views

“not a list of numbers” and “cannot be used for replacing ” [duplicate]

I am trying to plot a function which is based on the solution of some equation; I could get the correct figure but only after lots of warnings are printed out. The following is a minimum version of ...
2
votes
2answers
2k views

How to define a function based on the output of DSolve? [duplicate]

I would like to define a function based on the output of the following DSolve call: ...
4
votes
1answer
550 views

Fourier in Mathematica different from octave [duplicate]

First I create a table of sin(x) within 0, 10 ...
3
votes
2answers
890 views

Find minimum value of function which calls NDsolve [duplicate]

I have defined a function which takes a coefficient for a differential equation as an argument, solves the differential equation with NDSolve, and returns the value of the solution at time t=10. I can ...
3
votes
2answers
148 views

Sorting and keeping the main format of list numbers [duplicate]

I have a list with these elements: list={1/2 (1 + Sqrt[5]), 1, 1, 1/2 (1 - Sqrt[5]), 0}; I want to sort them with ...
1
vote
1answer
2k views

Append[] is not working for empty list [duplicate]

I am trying to create an empty list and add an element but the list is not being populated. My code ...
2
votes
2answers
159 views

ImageData reverses the order of the row of an Image [duplicate]

Could someone convince me what is the utility of doing a function like ImageData that reverses the order of rows in an image? Why was it coded like this? Why does ...
3
votes
2answers
423 views

Maximizing a function defined using NIntegrate [duplicate]

I have two functions fn[x,y,z] which is in integral form and I have another function gn[x,y] which is also in integral form ...
4
votes
1answer
826 views

FindMinimum, NMinimize, etc. with external process [duplicate]

I was hoping to be able to use MMA's minimization power to work with an external process. I want to minimize the function 'TryThisNumber[x_]' which sends the value of x to something external and gets ...
2
votes
1answer
879 views

Error: in the part assignment is not a symbol [duplicate]

I am trying to set part of a Doubly-indexed list aInitialPopulation to cNumHeg. Specifically I am trying to set the 3rd part of the list aInitialPopulatiom[[cNodeNumber]] to cNumHeg. My (attempted) ...

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