If: No signal Then: number = "0"

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Iljar Dickhof 2018-4-24

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https://ww2.mathworks.cn/matlabcentral/answers/397032-if-no-signal-then-number-0

评论： Jan 2018-5-1

image.png

Is it possible for no signal to be equal to the number zero. As can be seen in the graph, with no signal I get a constant value from the previous time step, until it receives a signal again. These constantes run horizontally in the graph. Is it possible to equate these horizontal lines to zero?

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Ameer Hamza 2018-4-24

How can you decide which output is correct and what is no signal. You mentioned that

"with no signal I get a constant value"

so does this means if you get two constant values like (..., 1, 1, ...) consecutively, the second value is corresponding to no signal. If not? then after how much consecutive constant values, you will be sure that this is no signal.

Image Analyst 2018-4-30

Do you need to do this on a "live" signal constantly coming in? Or do you want to do this on a signal that has already been captured and put into a variable (possibly after being read in from a file)?

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回答（1 个）

Jan 2018-4-24

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With FEX:RunLength:

[B, N]   = RunLength(Signal);
B(N > 2) = 0;
Signal   = RunLength(B, N);

Now all elements which occur 3 or more times are set to 0.

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Iljar Dickhof 2018-4-30

Signaal bewerking.PNG

Hello,

I installed the C compiler and downloaded the code. All errors are now gone (which I am quite happy with). The graph can be seen in the attached appendix. Thank you for this result.

My code now looks like this:

*>> time = simout4.Time;

>> y = simout4.Data;

>> [B, N] = RunLength (y);

>> B (N> 2) = 0;

>> y = RunLength (B, N);

>> plot (time, y, 'r')

Simout4 is the signal coming from my simulink model.

Now my next question is as follows:

I work in Simulink and wondered if this signal could then be loaded into Simulink again. Then I can use it again in my model.

Jan 2018-5-1

I do not work with Simulink, so I cannot give a reliable answer. But this is a new question. Please open a new thread, because it allows for keeping the overview, if you post one question per thread only.

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