set intervals with starts and ends in two arrays

Question

gabriele fadanelli 2021-4-20

0
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https://ww2.mathworks.cn/matlabcentral/answers/807082-set-intervals-with-starts-and-ends-in-two-arrays

编辑： Matt J 2021-4-20

I know this should be quite an easy answer, but I cannot find the solution: I have two arrays one marks the beginning of the intervals the other sets the ends. so:

starts = [ 1 20 30 40];
ends = [3 22 34 41];

with the ends always ending before the next start. I would like to get an array intervals which should appear either:

intervals = [1 2 3 20 21 22 30 31 32 33 34 40 41];

or:

intervals = [1 2 3; 20 21 22; 30 31 32 33 34; 40 41];

this sounds so dumb to me that I cannot find a way...anyway, I hope somebody can easily help me thanks.

Also, I need to AVOID FOR CYCLES TO DO IT.

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gabriele fadanelli 2021-4-20

I don't really know, but the solution to the problem should be given without using a for cycle, it is mandatory, not my fault.

gabriele fadanelli 2021-4-20

在 MATLAB Online 中打开

I thought it was easy to do it with

starts : ends

or

starts':ends'

but none of them works

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Answer 1

Matt J 2021-4-20

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https://ww2.mathworks.cn/matlabcentral/answers/807082-set-intervals-with-starts-and-ends-in-two-arrays#answer_679452

编辑：Matt J 2021-4-20

在 MATLAB Online 中打开

Because it's homework, I've left some blanks for you to fill in.

starts = [ 1 20 30 40];
ends = [3 22 34 41];
D=ends-starts;
M=______;
N=numel(starts);
e=(0:M).';
map=______
map = 5×4 logical array
   1   1   1   1
   1   1   1   1
   1   1   1   0
   0   0   1   0
   0   0   1   0
result=double(map).*e(:)+starts;
result(map).'
ans = 1×13
     1     2     3    20    21    22    30    31    32    33    34    40    41