0.48 and 0.72 not detected in the array
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HYZ on 24 Jan 2023
Commented: Stephen23 on 24 Jan 2023
I have attached varmat.mat. In this array, I can find any other elements in the array using find (SessionData.CoherenceTypes == 0.08) for example.
whenever I want to look for 0.48 or 0.72 using SessionData.CoherenceTypes == 0.48 or SessionData.CoherenceTypes == 0.72, the vector returned is empty although 0.48 and 0.72 are in the row vector. I tried in multiple computers and those two values are not detected.
Please suggest what was the problem. thanks.
Stephen23 on 24 Jan 2023
"Please suggest what was the problem."
This is a completely expected result with binary floating point numbers:
This is highly recommended reading material as well:
the cyclist on 24 Jan 2023
Edited: the cyclist on 24 Jan 2023
Due to floating point precision, the values are not exactly 0.48. For example,
SessionData.CoherenceTypes(256) - 0.48
When doing comparison for floating point numbers, you need to check for equality within a tolerance.
See, for example, this documentation for details about floating point numbers and how to deal with them.
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