ISMEMBERF

Floating-point ISMEMBER (i.e., with round-off tolerance)

Version 1.10.0.0 (5.6 KB)
4K Downloads
(8)
24 Oct 2010

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Matlab ISMEMBER uses strict exact comparison between floats.
The ISMEMBERF (note the "F") can tolerate some round off error.
It is possible to configure the tolerance.'rows' option is also supported.

Example:

[tf, loc]=ismember(0.3, 0:0.1:1) % returns false
[tf, loc]=ismemberf(0.3, 0:0.1:1) % return true

Cite As

Bruno Luong (2026). ISMEMBERF (https://uk.mathworks.com/matlabcentral/fileexchange/23294-ismemberf), MATLAB Central File Exchange. Retrieved .

General Information

MATLAB Release Compatibility

  • Compatible with any release

Platform Compatibility

  • Windows
  • macOS
  • Linux
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Version Published Release Notes
1.10.0.0

Replace soon-deprecated strmatch with strncmpi
1.9.0.0

Complete H1 lines with specification of LOC and membership criteria
1.7.0.0

Correct bug reported by Jan, better description in H1 line (thanks)
1.6.0.0

Correct bug reported by David
1.3.0.0

Important change in the engine when using 'rows' option, which saves the runtime by about 30%. Some adjustment with automatic tolerance.
1.1.0.0

Extend ISMEMBERF to complex arrays
1.0.0.0