Jul 13

[Znalezione] Wieża Saurona

[PL] Znalezione w sieci Add Comment (0)

Wieża Saurona zbudowana z 50 000 klocków Lego: tutaj

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May 11

[Music] Pokemon theme piano cover

[PL] Muzyka Add Comment (0)

I really hate Pokemons and stuff like that, but in my opinion this performance is delightful.

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May 11

[Music] Interactive YouTube Keyboard

[PL] Muzyka music, virtual keyboard Add Comment (0)

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Dec 7

[Ubuntu] Lightning view panel disappears in Thunderbird

Ubuntu Add Comment (0)

I’ve noticed a problem with Lightning view panel in Thunderbird. After each restart of Thunderbird it disappears and I must resize it using vertical line on the right.
User Skip Head has solved this problem:

hover your mouse pointer over the line, in the middle of line where the tiny
dots are – your pointer will turn into a hand. Click on the dots and
the today pane will jump out to regular size. Now it will stay the
correct size.

Click here for more details

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Nov 20

[Matlab] Generating random numbers with given covariance matrix

AI, Matlab Add Comment (0)

We are given a covariance matrix, and we’d like to generate n vectors, whose coordinates’ covariance matrix is equal to given. We also like each coordinate to have given mean.
Here is a code:

function numbers = randomcov(n, covMatrix, offset)
    x=randn(n,length(covMatrix(1,:)));
    numbers = x*inv(chol(cov(x)))*chol(covMatrix);
    for i=1:length(offset)
        numbers(:,i) = offset(i)+numbers(:,i)-mean(numbers(:,i));
    end
end

Usage:
n – number of vectors to generate
covMatrix – given covariance matrix
offset – vector of means of each coordinate

Example:

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