MATLAB: @Matt Fig: where’s our hump-day puzzler

hump-daypuzzler

Thank you!

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Believe it or not, I am working on one for next week! I am trying to decide whether or not it is too hard for most people to solve as a challenger, and interesting enough for them to want to do so in the first place... It is a test of how well folks understand MATLAB indexing....

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MATLAB: What is your unusual use of MATLAB

My cat likes to chase the laser pointer. Once the battery has run out and I wrote a few lines of code to give him the entertainment :)

Something like that (Lissajous curve):

figure('menubar','none','color','k')
h = plot(sin(sqrt(2)*0+sqrt(3)),cos(sqrt(5)*0),'r.','MarkerSize',20);
xlim([-1 1])
ylim([-1 1])
axis off
for t=0.01:.01:100
    set(h,'xdata',sin(sqrt(2)*t+sqrt(3)),...
        'ydata',cos(sqrt(5)*t))
    drawnow
end

MATLAB: Indexing arrays with matrices

Now that is the kind of wondering that lead me to the project which lead me to the challenger!

I think we can see what is going on by taking it one at a time:

A([1 1; 2 2],:,:)

So this produces the same thing as this:

A([1 2 1 2],:,:) % Read the indexing array as (:).

Now it makes sense: Take - Row one, then Row two, then Row one, then Row two for all higher dimensions (i.e., for each column and page).

Similarly with the other indexing arrays.

REPMAT and BSXFUN are deep funtions in terms of really understanding how they (and consequently, MATLAB indexing in general) work.

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MATLAB: What is your unusual use of MATLAB

MATLAB: Indexing arrays with matrices

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