abs - Absolute value (magnitude)

Description

abs is a MATLAB^® function.

Examples

Calculate the magnitude of the DFT of a sequence:

t = (0:99)/100;                        % Time vector
x = sin(2*pi*15*t) + sin(2*pi*40*t);   % Signal
y = fft(x);                            % DFT of x
m = abs(y);                            % Magnitude
m=m(1:51);											% Unique magnitudes

Plot the magnitude:

f=0:50;     % Frequency vector
plot(f,m);
ylabel('Magnitude'); xlabel('Hz');

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