# Luqman Saleem

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**Feeds**

Question

How to fine numerical gradient

I have a function f(x,y). Following is just a sample function explaining how I save f(x,y) value in a 2D array. clear; clc; ...

3 months ago | 2 answers | 0

### 2

answersQuestion

Breaking down a numerical integration into two parts

Sorry for this stupic question. Suppose we have this integral Of couse this can be solved analytically. But I still want t...

4 months ago | 1 answer | 0

### 1

answerQuestion

How to correctly store and access data in a 4D array?

Suppose I store some 2-by-2 matrices in a 4D array as following data = zeros(10,5,2,2); for i = 1:10 for j = 1:5 ...

4 months ago | 1 answer | 0

### 1

answerQuestion

Tracking failed integral2() inside a for loop

I'm running the integral2() function within a `parfor` loop. Occasionally, the integration fails during some iterations, and I r...

4 months ago | 1 answer | 0

### 1

answerQuestion

How can I ensure that the initial solution (x0) for fsolve does not result in Inf or NaN values?

I'm attempting to solve an equation for a system under a small external force. It's sensible to seek the solution near the solut...

4 months ago | 2 answers | 0

### 2

answersQuestion

How is the work distributed in parfor loop?

In a scenario with a parfor loop consisting of 10000 iterations distributed over 10 workers, is each worker initially assigned 1...

4 months ago | 2 answers | 0

### 2

answersQuestion

What happens when we call a function containing a parfor loop within another parfor loop?

Consider answer = zeros(1,5); parfor x1 = 1:5 answer(x1) = fun(); end function output = fun() R = zeros(1,10...

5 months ago | 1 answer | 0

### 1

answerQuestion

Speeding up code to refine grid points

I want to calculate following 2D integration as sums. and are constants, is identity matrix of order 2, and is a 2 by 2 m...

5 months ago | 0 answers | 0

### 0

answersQuestion

The fastest method to perform sum of function

Suppose that I have a function fun(x,y,z) whose output is a 2 by 2 matrix (one example is given below). I want to calculate the ...

5 months ago | 3 answers | 0

### 3

answersQuestion

Using parfor to evaluate integrations

Probably a stupid question. I want to integrate a function f(x,y). Can I use parfor() as shown below to compute the sum? I am c...

5 months ago | 1 answer | 0

### 1

answerQuestion

integral vs trapz vs sum

The result obtained from trapz() differs in sign compared to the approximation from integral() and the summation approach for th...

5 months ago | 1 answer | 0

### 1

answerQuestion

Integration of these kind of functions

I want to integrate is a 2 by 2 matrix (given below), is identity matrix of order 2, and and and positive real numbers. I ...

5 months ago | 0 answers | 0

### 0

answersQuestion

Solving a matrix equation with fixed point iteration method

I want to solve the following equation for where I believe Equ.1 can be solved using fixed iteration method. The twist he...

6 months ago | 1 answer | 0

### 1

answerQuestion

Where does the eigenvalues of 3-by-3 matrix meet?

I have a 3x3 Hermitian matrix dependent on 10 variables. Each combination of these variables yields three eigenvalues: E1, E2, a...

10 months ago | 0 answers | 1

### 0

answersQuestion

Solving self-consistent equations that involve matrices

I want to calculate for a given value of and . The self-consistent equation is And here is identity matrix of order , ...

10 months ago | 1 answer | 0

### 1

answerQuestion

Cauchy integral theorem vs. integral formula

Let's have the following integral: Here and are real and positive number. We can solve this integral using Cachy integral t...

12 months ago | 1 answer | 0

### 1

answerQuestion

Faster method for numerical integration in 3D

I have a very complex expression which includes three integrations: Please bear with me. This looks very complicated but in...

1 year ago | 0 answers | 1

### 0

answersQuestion

numerical curl vs symbolic curl

I am tring to calculate curl of an expression both numerically and symbolically. When I compare them both, they are very differ...

3 years ago | 1 answer | 1

### 1

answerQuestion

Calculating integration using for loops

My question is about 2D square Brillouin zone integrations. Problem Summary: I am rederiving one of the results of this public...

3 years ago | 0 answers | 0

### 0

answersQuestion

How to take cross product of two 2D vector fields

I have 2 vector fields say and . I want to calculate cross product of A and B . I have 2D matrices of and . i.e. clear; cl...

3 years ago | 1 answer | 0

### 1

answerQuestion

Is there any work around the error "Array concatenation is not supported"?

I have a function which take two inputs (x,y) and return three outputs (out1,out2,out3). I want to evaluate this function for 2D...

3 years ago | 2 answers | 0

### 2

answersQuestion

Approximating Definite Integrals as Sums

I have a function that I want to integrate over and . I know the answer of this integration is . When I use function, I get t...

3 years ago | 1 answer | 1

### 1

answerQuestion

3D integral failure

I am trying to sovle the following integration but integral3 keeps failing. Is there any work around for this. The expression fo...

4 years ago | 0 answers | 0

### 0

answersQuestion

Why parfor loop memory keep increasing?

I am using R2018b on Windows 10. My code have 3 for loops and I want to use parfor above them. In each parfor loop, it is expect...

4 years ago | 1 answer | 0

### 1

answerQuestion

Evaluating 2D function on 2D grid without using "for" loops

I have a function f(x,y) and I want to evaluate it on x,y grid. For example, f = @(x,y) x^2+y^2; x = 1:10; y = 1:5; %one...

4 years ago | 1 answer | 0

### 1

answerQuestion

How can I numerically solve the following integration in matlab?

I have an equation of the following form: where A,B,C, and q are 3-by-3 matrix and Tr[...] represent trace. And here b=1e3...

4 years ago | 0 answers | 0

### 0

answersQuestion

How to keep track of order eigenvalue in eig or eigs?

I have a matrix equation defined at each point of variable k. The equation is where and is a 6-by-6 matrix. Once I solve my...

4 years ago | 3 answers | 0

### 3

answersQuestion

How can I copy latest data of Corona-virus cases from worldometers.info using a MATLAB code?

Is there any simple way to copy data from a table given on https://www.worldometers.info/coronavirus/ website link?

4 years ago | 1 answer | 0

### 1

answerQuestion

Creating all possible combination of 0 and 1 in 2D array

Let the size of 2D matrix is (n rows, m cols). How can I create all possible combinations of 0 and 1 in this matrix?

4 years ago | 2 answers | 0

### 2

answersQuestion

Generating combination of binary numbers

Variable and are some integers and . I want to create permutation of 1s and 0s in the order shown below. Let and A = [1...

4 years ago | 1 answer | 0