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# peak2rms() - Signal Processing

### Syntax

### Example

### Output / Return Value

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### Alternatives / See Also

### Reference

Y = peak2rms(X) returns the ratio of the largest absolute value in X to the root-mean-square (RMS) value of X. peak2rms operates along the first nonsingleton dimension of X. For example, if X is a row or column vector, Y is a real-valued scalar. If Y is an N-by-M matrix with N > 1, Y is a 1-by-M row vector containing the peak-magnitude-to-RMS levels of the columns of Y.Y = peak2rms(X,DIM) computes the peak-magnitude-to-RMS level of X along the dimension, DIM.

Y = peak2rms(X)Y = peak2rms(X,DIM)

Peak-Magnitude-to-RMS Ratio of SinusoidOpen This Example Compute the peak-magnitude-to-RMS ratio of a 100 Hz sinusoid sampled at 1 kHz. t = 0:0.001:1-0.001; x = cos(2*pi*100*t); y = peak2rms(x) y = 1.4142 Peak-Magnitude-to-RMS Ratio of Complex ExponentialOpen This Example Compute the peak-magnitude-to-RMS ratio of a complex exponential with a frequency of rad/sample. Create a complex exponential with a frequency of rad/sample. Find the peak-magnitude-to-RMS ratio.n = 0:99; x = exp(1j*pi/4*n); y = peak2rms(x) y = 1 Peak-Magnitude-to-RMS Ratios of 2-D MatrixOpen This Example Create a matrix where each column is a 100 Hz sinusoid sampled at 1 kHz with a different amplitude. The amplitude is equal to the column index. Compute the peak-magnitude-to-RMS ratios of the columns.t = 0:0.001:1-0.001; x = cos(2*pi*100*t)'*(1:4); y = peak2rms(x) y = 1.4142 1.4142 1.4142 1.4142 Peak-Magnitude-to-RMS Ratios of 2-D Matrix Along Specified DimensionOpen This Example Create a matrix where each row is a 100 Hz sinusoid sampled at 1 kHz with a different amplitude. The amplitude is equal to the row index. Compute the RMS levels of the rows specifying the dimension equal to 2 with the DIM argument.t = 0:0.001:1-0.001; x = (1:4)'*cos(2*pi*100*t); y = peak2rms(x,2) y = 1.4142 1.4142 1.4142 1.4142