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# Michal Kvasnicka

Last seen: 2 days ago Active since 2015

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Matlab is significantly slower than Julia on simple evaluation
More and more frequently some people open the question about speed comparison between Matlab and Julia. The main Julia developer...

22 days ago | 2 answers | 1

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answers

Question

expm function problem for stiff matrix
For very specific matrix A: a = -1e20; b = eps; c = 1; A = [a,0,b;0,c,0;-b,0,a]; disp('A:'), disp(num2str(A)) A: ...

6 months ago | 2 answers | 1

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Answered
histogram of signals gaps width
This is much more simple Matlab implementation but still not optimal (+ not vectorized): signals = [1.1 NaN NaN NaN -1.4 NaN 8...

6 months ago | 0

Question

histogram of signals gaps width
I am looking for algorithm (effective + vectorized) how to find histogram of gaps (NaN) width in the following manner: signals ...

6 months ago | 2 answers | 0

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answers

Answered
how to install supported CUDA Toolkit 10.2 on Ubuntu 20.04 LTS Linux
After thorough discussion with Matlab support and several relevant forums (Ubuntu, NVIDIA, ...) the final result is as follows: ...

12 months ago | 0

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Question

how to install supported CUDA Toolkit 10.2 on Ubuntu 20.04 LTS Linux
As you can see here, the CUDA Toolkit currently suported by R2020b is 10.2. But, as you can see here , the only supported versio...

12 months ago | 3 answers | 1

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answers

Question

possible speed up of the ischange function by parfor
I completely understand, that any modifications of standard MATLAB functions are very dangerous, but I found the possibility how...

1 year ago | 0 answers | 0

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answers

Question

simple bernoulli sampler function
I am trying to find replacement of binornd function by standard MATLAB code. Is the following command r = binornd(1,p,sz) exa...

1 year ago | 1 answer | 0

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answer

Answered
What frustrates you about MATLAB? #2
Do you really think, that these threads are read by MTW people??? I am not sure!!! TMW definitely choose the commercial way of ...

1 year ago | 0

Answered
2018b gcc support on Ubuntu 18.04
May be this is possible solution for you: https://www.mathworks.com/matlabcentral/answers/407502-incompatible-gcc-version-with-m...

1 year ago | 0

Answered
Multi-precision linear programming
One of possible way (so far only known to me) how to solve directly and eficiently LP problems with full multi-precision support...

1 year ago | 0

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Question

Multi-precision linear programming
I need to solve specific linear programming problem which is based on Mallows permutation probability distribution. This exponen...

1 year ago | 2 answers | 0

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answers

Answered
strange power .^ operator behaviour
Very interesting description of the integer power problem: http://szhorvat.net/pelican/fast-computation-of-powers.html

2 years ago | 0

Question

strange power .^ operator behaviour
Take a look on this FEX. For vectors of length greater than >~100 elements it is more efficient to use multiple x.^2 than x....

2 years ago | 2 answers | 0

### 2

answers

Question

incremental training (large data set)
Is the following approach suitable for NN incremental learning in general? for bn = 1:num_batches inputs = <get batch ...

2 years ago | 1 answer | 0

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answer

Answered
matchpairs function input parameter costUnmatched
I propose the following costUnmatched input parameter estimation for given Cost matrix: costUnmatched = max(size(Cost)) * max(C...

2 years ago | 0

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Question

matchpairs function input parameter costUnmatched
How to choose proper value of parameter costUnmatched (matchpairs function) to get requested number of matches. Especially in a...

2 years ago | 1 answer | 0

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answer

Question

MATLAB Answer need better policy
Just one remark regarding current situation on MATLAB Answer portal: A lot of people (including highly trustworthy) aswers on m...

2 years ago | 1 answer | 0

### 1

answer

Answered
"symmetrical" rows of matrix
I present the best solution so far: d = ~pdist2(A(:,1:end/2), A(:,end/2+1:end)); [iA1, iA2] = find(triu(d & d.'));

2 years ago | 0

| accepted

Question

"symmetrical" rows of matrix
I have integer matrix A (nA x c) with even number of columns (e.g. mod(c,2) = 0) and unique rows. How to effectivelly (by spe...

2 years ago | 1 answer | 0

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answer

Question

what is recommended way to apply incremental ANN learning
I would like to apply ANN for approximation (regression) of the larga data set of points {x_i, y_i}, where x_i are input vectors...

2 years ago | 0 answers | 0

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answers

Question

MATLAB Connector not running
I am using Matlab Connector on Linux (LinuxMint 19.3 based on Ubuntu 18.04). When I start MATLAB connector (v 1.4.0.6) and the...

2 years ago | 0 answers | 0

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answers

Question

how can I effectively compute expected value by histogram approximation of probability desnsity function
What is the proper way to compute effectively (fast) the expected value E(x) in a case when I have approximation of probability ...

2 years ago | 1 answer | 0

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answer

Question

symbolic function with specific properties
I need to implement the symbolic function E(m(x)), where x = [x1, ..., xN] are symbolic variables, with the folowing property: ...

2 years ago | 0 answers | 0

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answers

Answered
Check if I have done everything right
Your riemann function is completely wrong! Try this: function [integral] = riemann(x) integral = sum(calc...

2 years ago | 0

Answered
Randomly sorting rows while keeping column relationships the same
Apermrows = A(randperm(size(A,1)),:)

2 years ago | 3

| accepted

Answered
running functions in multiple instances
You need to run three function on two matlab instances simultaneously? If yes, so open two separate instances of Matlab and run...

2 years ago | 1

Answered
Does Matlab support GTX 1660 graphics card?
Definitely yes!!! Did you install the proper nvidia driver on your system?

2 years ago | 0

| accepted

Question

ranking of vector with non-unique elements
I need to perform fast ranking of the vector with non-unique elements, like in the following example: F = [10.1 31.0 20.5 20.5 ...

2 years ago | 1 answer | 0

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answer

Question

vector of integers modification
I have vector of positive integers which I need to modify into vector of consecutive integers with the same ordering. Example: ...

2 years ago | 1 answer | 0

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