how to index value falling particular interval

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Jay Hanuman 2016-12-22

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https://ww2.mathworks.cn/matlabcentral/answers/317853-how-to-index-value-falling-particular-interval

评论： Guillaume 2016-12-22

I have sequence of numbers [2 2 5 11 15 11 0 7 8 21 27 21 0 1 22 24 24 3 3 13 1 11 13] with min 0 and max 27 value. I want to divide values in intervals of size 4 i.e. 0-3,4-7,8-11,,,,24-27 and want to index particular value in which it falls. i.e. here 7 intervals. 2 falls in 1st interval so index as 1, 5 falls in 2nd interval so index as 2, so as follows

2 2 5 11 15 11 0 7 8....
1 1 2 3  4  3  1 2 3....

how to do it.

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Answer 1

Guillaume 2016-12-22

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Use discretize:

v  = [2 2 5 11 15 11 0 7 8 21 27 21 0 1 22 24 24 3 3 13 1 11 13];
bins = min(v):4:max(v)+4;
[v; discretize(v, bins)]

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Jay Hanuman 2016-12-22

but interval should be 0-3,5-7,...,23-27, in above code it showing 0-4,5-8,,,,

Guillaume 2016-12-22

The intervals are 0 included to 4 non-included, so [0-4[, 4 included to 8 non-included, so [4-8[, etc. Considering integers, these are thus, 0-3 included, 4-7 included. Exactly as you asked, as can be seen from the output of my code that exactly matches what you asked.

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