Flip signal (positive and negative)

I need help to program a flip-signal to separate the negative signal from the negative and reverse it ?

[Rik]

Have a read here and here. It will greatly improve your chances of getting an answer.

Answer 1

[Image Analyst]

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;

[Rik]

Maybe abdullah qasim even means abs?

[Jan]

[MOVED FROM FLAGS] abdullah qasim wrote:

no i meaning flip-ofdm program

@abdullah qasim: Please use flags only to inform admins and editors about inappropriate content like spam or rudeness. Thanks.

[Souarv De]

@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]

You don't have to. You could simply negate it. Like I said, I didn't know what the original poster really wanted.

Answer 2

[Crispin Foli]

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.