Relationship Block Not Working As Expected when using single data type

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I found out that single(1)-single(0.9) is larger than single(0.1) in simulink. Using the display block, I can see that this is due to how the numbers are represented. However, I expected that, intuitively, 1-0.9 should be equal to 0.1, I am wondering how can I fix this issue. Meanwhile, if I use the generated code, will the code perform differently(especially on diferent hardwares). Please see the attached picture for details.

Answers (1)

Mark McBroom
Mark McBroom on 11 Sep 2022
There is nothing to "fix". You should design your algorithm so that you are not comparing floating point variables to floating point constants. If this is not possible, you could try using fixed point or integer math. This answer gives more detail to floating point numbers.

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