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# Kobye

### McGill University

17 total contributions since 2013

Professional Interests: Mechanical Engineering

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Question

Most efficient way to add multiple sparse matrices in a loop in MATLAB
I have a code that repeatedly calculates a sparse matrix in a loop (it performs this calculation 13472 times to be precise). Eac...

6 years ago | 2 answers | 1

### 2

How can i calculate the cross product of two cell vectors?
Your question isn't written very clearly at all. Please take some time to clearly describe your problem and help the community a...

7 years ago | 1

Question

MATLAB cropping colorbar text - how to fix?
The problem looks as in the attached image. The exponent in the colorbar scale indicator (i.e. 10^9 symbol next to the colorbar)...

7 years ago | 2 answers | 1

### 2

Question

Numerical integration error for a function in x,y that can be analytically integrated!
I am getting the error: "Error in integral2 (line 107)" when trying to numerically evaluate the below surface integral. fun...

7 years ago | 1 answer | 0

### 1

Question

Numerical integration over a circular domain
I have an analytic function defined over x=[0,100] and y=[0,100]. I do not know the precise workings of the function, just that ...

7 years ago | 1 answer | 0

### 1

Question

Matlab function slow first time, much faster subsequently. Why?
I have a large MATLAB function file. It first creates a zero matrix, then updates about 70% of the cells by evaluating a number ...

7 years ago | 1 answer | 0

### 1

Using fprintf to specify a filename for write to text file in loop

7 years ago | 0

Question

Using fprintf to specify a filename for write to text file in loop
I am creating a number of text files (or really m files) in a loop. The filenames should be sequential, having the suffix 1,2,3...

7 years ago | 2 answers | 0

### 2

Question

Parallel computation leaking memory and slowing a loop
I am doing a parallel computation, specifically a row by row integration of a symbolic matrix (sic I am integrating 4 rows at a ...

7 years ago | 4 answers | 3

### 4

Question

OOP in Matlab - What to do when the output is a different class following method?
I am new to Object Oriented Programming. After _a lot_ of stressing, I have finally managed to define my own class of objects in...

8 years ago | 1 answer | 1

### 1

Redefining the _mult command in muPad (MATLAB symbolic engine)
I've done the hard bit and have managed to define a method that does what I want. I will provide it here for reference. I would ...

8 years ago | 0

Question

Redefining the _mult command in muPad (MATLAB symbolic engine)
I have created a user-defined domain in muPad called Bx. Each object in this domain is defined by two variables: n and k. B...

8 years ago | 1 answer | 0

### 1

Question

Getting MATLAB/muPad to recognize and treat variables in a custom manner
I have a symbolic vector that looks as follows: n=4; syms x y z B = sym(zeros(n, 1)); for k=0:n B(k+1) ...

8 years ago | 0 answers | 0

### 0

Symbolic substitution: Subs command is substituting zeros with 'new' despite 'old' not being defined as zero - why?
I have found the answer. I am using Matlab R2012b. There is a bug in the code that switches the arguments old and new if subs...

8 years ago | 0

| accepted

Question

Symbolic substitution: Subs command is substituting zeros with 'new' despite 'old' not being defined as zero - why?
I've got a simple piece of symbolic code below. It all seems to work well, except one strange thing happens. Vx1_before contains...

8 years ago | 1 answer | 0

### 1

Question

How can I speed up this code?
I really need to speed up the code below. It is part of a stress analysis module. The idea is that the more basis polynomial te...

8 years ago | 0 answers | 0