Matlab function find does not work on floating point [duplicate]

Question

 tfinal = 10;
 dt_fine = 0.0000001;
 tvec_fine = [0:dt_fine:tfinal];
 find(tvec_fine==0.1)


ans =
Empty matrix: 1-by-0

Why does the above code not find the index where tvec_fine has the entry 0.1. It clearly has the entry based on the definition of tvec_fine.

aha, floating point precision - stackoverflow.com/questions/686439/… — GameOfThrows
– GameOfThrows, Commented May 4, 2017 at 14:56

Stack Player · Accepted Answer · 2017-05-04 15:24:40Z

0

This is because floating point has a narrow precision, and 0.1 could end up being 0.10000001 vs 0.1000000002 for example.

This is a very rough description just to give you an idea, as pointed in the comments more developed answers and solutions are already available on SO.

answered May 4, 2017 at 15:24

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