How to index time interval more efficiently?

Question

balandong 2017-6-28

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https://ww2.mathworks.cn/matlabcentral/answers/346554-how-to-index-time-interval-more-efficiently

编辑： Stephen23 2017-6-29

Hi Matlab Coder, The objective is to index each of the matrix, as follow

where_owl = [8  9  32  33  56  57]
owl_hide =  [9 20  33  44  57  68]
owl_awake = [0  8  24  32  48  56]

How to make following code more compact and efficient, especially the for-loop. Thanks in advance

s.days                              = 3;
s.sph                               = 3600;
s.hpd                               = 24;
s.mph                               = 60;

owl_awake = zeros(1,10);
owl_hide = zeros(1,10);
where_owl = zeros(1,10);
total_hour = 2 * s.days  *s.hpd;
last_iteration = total_hour/s.hpd;
s.sleeptime_time =zeros (1,last_iteration);
a=0;
%%%%%   Case 1: Timing| All unit in seconds
for i = 1:2:last_iteration
  a=a+1;
  % owl_awake 0000 to 0800 every day
  owl_awake (:,i) = ((a-1)*s.hpd);
  owl_awake (:,(i+1))= (8+ ((a-1)*s.hpd));
  % owl_hide between 0900 and 2000
  owl_hide (:,i)          = (9 + ((a-1)*s.hpd));
  owl_hide (:,(i+1))      = (20 + ((a-1)*s.hpd));
  % where is the owl
  where_owl (:,i)       = (8 + ((a-1)*s.hpd)) ;
  where_owl (:,(i+1))   = (9 + ((a-1)*s.hpd));
end

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jpai 2017-6-28

Do you mind describing what this code is supposed to do?

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Answer 1

David Goodmanson 2017-6-28

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https://ww2.mathworks.cn/matlabcentral/answers/346554-how-to-index-time-interval-more-efficiently#answer_272264

编辑：David Goodmanson 2017-6-28

在 MATLAB Online 中打开

Hi balandong,

Here is one way to accomplish this. At present the function in the script below has no semicolons at the end of a couple of lines so it illustrates what is going on.

s.days = 3
owl_awake = owl(s.days,[0 8])
owl_hide = owl(s.days,[9 20])
% etc.
function hoursvec = owl(ndays,interval)
rep24 = 24*(0:ndays-1);
[a b] = meshgrid(rep24,interval)
apb = (a+b)
hoursvec = apb(:)';
end

If I may ask, what is the owl doing between the hours of 2000 and 2400?

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balandong 2017-6-29

Thanks David, this code is more compact and generalized. To answer you question, the owl repeatedly say Thank You between the hours of 2000 and 2400!. Cheers