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Flip signal (positive and negative)

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I need help to program a flip-signal to separate the negative signal from the negative and reverse it ?
  1 Comment
Rik
Rik on 6 Jun 2018
Have a read here and here. It will greatly improve your chances of getting an answer.

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Accepted Answer

Image Analyst
Image Analyst on 6 Jun 2018
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;
  4 Comments
Souarv De
Souarv De on 17 Sep 2023
@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 on 17 Sep 2023
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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More Answers (1)

Crispin Foli
Crispin Foli on 10 Jul 2020
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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