Community Profile # Michal Kvasnicka

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84 total contributions since 2015

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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: ...

7 days ago | 0 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...

22 days 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 ...

23 days ago | 2 answers | 0

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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: ...

6 months ago | 0

| accepted

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...

6 months ago | 2 answers | 1

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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...

8 months ago | 0 answers | 0

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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...

8 months 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 ...

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

1 year 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....

1 year ago | 2 answers | 0

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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 ...

1 year 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...

1 year 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...

1 year 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...

1 year ago | 1 answer | 0

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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.'));

1 year ago | 0

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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...

1 year 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...

1 year ago | 0 answers | 0

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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...

1 year ago | 0 answers | 0

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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 ...

1 year 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: ...

1 year ago | 0 answers | 0

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

1 year ago | 0

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

1 year 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...

1 year ago | 1

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

1 year 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 ...

1 year 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: ...

1 year ago | 1 answer | 0

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Question

vectorised code is terribly slower
Why is the vectorized version of simple local maxima detection code significantly slower (~2-3 times) than its for-loop version?...

2 years ago | 0 answers | 0

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