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daniel adams


Last seen: en dag ago Active since 2021

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Repeating elements of an array
Say for some . How can I create an array of size which is just i.e repeat the elements of times each in a row. Note I ...

4 dagar ago | 1 answer | 0

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answer

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Turn a two dimensional vector into an array
I have a subset of . I have discretised this subset into points, , also consider an identical copy of , . Now, I have a giv...

5 dagar ago | 1 answer | 0

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answer

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Using symbolic math to retain accuracy. Arrays
Hi folks. I am trying to avoid numerical underflow using symbolic math. Basically at some point in my algorithm I have a mat...

6 dagar ago | 1 answer | 0

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answer

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Storing small numbers and logarithms.
Hi I have the following problem, in my code I need to calculate for very large. The largeness causes matlab to store and to...

7 dagar ago | 2 answers | 0

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answers

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Precision number throughout scripts and functions.
I have a script that calls many functions, when I run the script I want matlab to use a specific value of precision throughout. ...

22 dagar ago | 1 answer | 0

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answer

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Why is this Matrix Multiplication taking so long... using diag function
Hi the vectors are of length , and an array is of length I want to turn into diagonal arrays to calculate the product and ...

25 dagar ago | 0 answers | 0

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answers

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Discretise a domain into a grid of uniform volume size
Given a domain say in how do I split/discretise the domain into a grid of uniform volume/ fixed number of grid points? For ...

28 dagar ago | 1 answer | 0

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Save figures from for loop into a subfolder of the current folder.
I will use math notation instead of saying arrays etc. In what follows and . I want to plot each column of against on separat...

28 dagar ago | 1 answer | 0

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Making a movie and saving figures
Given an array / matrix of size and a array / vector of size . I want to make a movie with frames each one being the followi...

ungefär en månad ago | 1 answer | 0

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Loose question, on function handles / speeding up run times.
This is quite a loose question but I was very surprised to find this out so thought I would ask. I was running a script where I...

ungefär en månad ago | 0 answers | 0

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answers

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Summing elements of a vector without a for loop
Given a vector/array of length , I would like to create a new vector of length where the 1st component is the sum of the 1st...

ungefär en månad ago | 2 answers | 0

2

answers

Question


2-dimension PDE on Matlab.
Matlab has this nice document for 1-dimensional PDE solver https://uk.mathworks.com/help/matlab/math/partial-differential-equati...

ungefär 2 månader ago | 0 answers | 0

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Setting a lower bound on the values of an array ( can it be done without a for loop?)
I have a matrix the values of it are very small, some are so small that they appear as NaN. Is there an efficient way to go thr...

ungefär 2 månader ago | 2 answers | 0

2

answers

Question


How to turn a matrix into a vector without using for loop !
Given a matrix is there a way in Matlab to construct a vector which is just the rows of layed out one after the other? Note I ...

2 månader ago | 1 answer | 0

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answer

Question


Turning a product of two vectors into a matrix without using for loops?
I have to two vectors and , each of length . I want a matrix where the elements of are . How can I construct on matlab with...

2 månader ago | 1 answer | 0

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Question


How to find a PDE solver ( new matlab user )
Hi folks, I am studying the Fokker-Planck equation $$ \partial_t \rho(x,t) = \text{div}(f(x) \rho(x,t))+ \Delta \rho(x,t) $...

2 månader ago | 1 answer | 0

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Question


Writing the dirac function as a function handle
Hi I want to write the dirac function at $i$ as a function handle, for example the code will look something like this dirac_...

2 månader ago | 1 answer | 0

1

answer

Question


How to use the sum function on a matrix to get the sum of the rows not the columns
How to use the sum function on an array to get the sum of the rows not the columns : I want to have an array of the sum of the ...

2 månader ago | 1 answer | 0

1

answer

Question


Cost matrix from an array without for loop.
Hi I want to create a matrix with entries the absolute value between each point in an array. My array is called domain, and it ...

2 månader ago | 2 answers | 0

2

answers