Clear Filters
Clear Filters

how to find a float number

5 views (last 30 days)
Suzuki on 20 Sep 2021
Commented: Suzuki on 20 Sep 2021
I have a data (saved as double), as in the attache file. I need to find for example if a certain float number (for ex. -0.334) exist or no.
but because the nubers actully exist as -0.3440099999999 or sth like that, I can't find.
I have tried to change the format, but it did'nt solve the problem.
Any suggestions??

Accepted Answer

per isakson
per isakson on 20 Sep 2021
Edited: per isakson on 20 Sep 2021
find( abs( y7 -(-0.3340) ) < tol )
You choose tol. See eps - Floating-point relative accuracy

More Answers (1)

Walter Roberson
Walter Roberson on 20 Sep 2021
[is_there, idx] = ismembertol(-0.3340, y7) %options allow you to control tolerances
[~, idx] = min(abs(y7(:) - (-0.3340)));
will show you the y7 that is closest to -0.3340, even if it is not very close. Whereas the ismembertol() will only return results if the value is within tolerance
  1 Comment
Suzuki on 20 Sep 2021
that solve the problem, thanks alot.

Sign in to comment.


Find more on Debugging and Analysis in Help Center and File Exchange

Community Treasure Hunt

Find the treasures in MATLAB Central and discover how the community can help you!

Start Hunting!