to compare the floating value of a signal with file.mat signal

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cyberdyne 2011-3-29

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关闭： MATLAB Answer Bot 2021-8-20

Hi,

In a simulink simulation i've "recorded" a signal in a file.mat. Now, in an other simulation i need to compare a new signal with file.mat-signal (i'll call file.mat-signal as m(t)).

For example with the floating value f(t) of the new signal (in the new simulation) i need to know the time t such that:

abs(f(t)-m(t)) < some tolerance value

I know that t is an element of the file.mat matrix, but i don't know how i can do the comparison in simulink.

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Answer 1

Seth Popinchalk 2011-3-30

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You can build the equation using blocks from the Math Operations and Logic and Bit Operations libraries.

You will need an ABS block, a Sum Block and you could use the Compare to Constant to make the comparison to the tolerance value. This produces a signal that will be 1 when the condition is true. That can be used to trigger or enable a conditionally executed subsystem.

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Kaustubha Govind 2011-3-30

Does your data in the MAT-file conform to the required format for From File (see http://www.mathworks.com/help/toolbox/simulink/slref/fromfile.html)? Also see the heading "Simulation Time Hits That Have No Corresponding MAT-File Time Stamps".

cyberdyne 2011-3-30

I've loaded mat-file. Inside it there are time value with 1s decimation (0 1 2 3...) as 1st row and there are signal value samples as 2nd row. If i plot 1st row-->2nd row, it returns me original signal as it is.

I tried to record time of the 1st simulation in an other mat-file and:

FromFile(time.mat)----->SubSystem(with Trig.)---->display

FromFile(Signal.mat)---(+)>Sum--->ABS---CompareToConst.(<0.01)-->trig.

SignalToCompare--------(-)|

But display doesn't show value of time of time.mat