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Flip signal (positive and negative)

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abdullah qasim
abdullah qasim 2018-6-6
评论： Image Analyst 2023-9-17
I need help to program a flip-signal to separate the negative signal from the negative and reverse it ?
  1 个评论
Rik
Rik 2018-6-6
Have a read here and here. It will greatly improve your chances of getting an answer.

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采纳的回答

Image Analyst
Image Analyst 2018-6-6
I have no idea what you want, but take a look at flipping functions flipud() and fliplr(), as well as masking:
negIndexes = signal < 0;
negValuesOnly = signal(negIndexes); % Extract neg values only, or...
% Set negative values to zero (masking)
noNegatives = signal; % Initialize.
noNegatives(negIndexes) = 0; % Set negatives to zero, positives remain as-is.
% Reverse the signal horizontally
reversedSignal = fliplr(signal);
% Invert the signal vertically
signal = max(signal) - signal;
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Souarv De
Souarv De 2023-9-17
@Image Analyst, for inversion of a signal vertically why do you subtract it from the maximum value? Does it not simply the postive values becomes and negative and vice-versa?
Image Analyst
Image Analyst 2023-9-17
You don't have to. You could simply negate it. Like I said, I didn't know what the original poster really wanted.

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Crispin Foli
Crispin Foli 2020-7-10
to flip the signal about the x-axis (negatives to positives and vice versa), simply use the function gnegate (x).
Where X is the signal you're flipping.
This turns all peaks to troughs and all troughs to peaks.

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