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Comparator block in simulink

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Caroline Rosa
Caroline Rosa 2013-3-24
评论： Wael Atiyah 2022-3-28
What is the block i can use in simulink that makes a comparison between two signals? I tried the block named "comparator" from "Simelectronics library" but it dosen't work because it doesn't enable connecting my inputs on it. thanks

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回答（2 个）

Jason Ghidella
Jason Ghidella 2013-3-27
An alternative is to use the built-in block "Relational Operator" block from the Logic and Bit Operations library in Simulink. There are other blocks in the library that you may also what to use.
A piece of advice though is the watch out for data type issues. If you are comparing doubles then you may not always get the result you are expecting due to the floatign point precisions of your machince, (eps).
Here is a thread on this topic: http://www.mathworks.com/matlabcentral/newsreader/view_thread/66553
Azzi Abdelmalek
Azzi Abdelmalek 2013-3-24
If you want to compare signal1 and signal2 use two block:
  1. sum block to get signal1-signal2
  2. compare to constant block where you will set constant value to 0. The input of this block is signal1-signal2
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Boubker Boutalha
Boubker Boutalha 2020-1-14
Thanks Abdelmalek !
To @Paranandi Lakshmi Narayana , with the solution proposed by @Azzi Abdelmalek, you still compare the signals, it is just applied the differential comparison to a costant.
For example, your signals are A and B, that could be numbers. You could compare them directly, like as follow:
A > B ; A greater than B
Or instead applying the differential, you do the following:
A > B ----> (A - B) > (B - B) ----> (A - B) > 0 ;
So, tell that A is greater than B, correspond to have (A - B) greater than the constant 0 (zero).
Kind regards,
Boubker
Wael Atiyah
Wael Atiyah 2022-3-28
Dear Mr.Abdalmalek
your suggestion not clear wirh respect to me , possible more clarrification

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