Array Analysis Details





	Array Analysis Calculate Array Differences DBL Calculate differences between consecutive array elements. 0th element of output is equal to x(0)- x(-1), where x(-1) is an optional scalar input that defaults to zero. Calculate Array Differences SGL Calculate differences between consecutive array elements. 0th element of output is equal to x(0)- x(-1), where x(-1) is an optional scalar input that defaults to zero. Calculate Array Differences Calculate Array Sums DBL Calculate sums of consecutive array elements. 0th element of output is equal to x(0)+ x(-1), where x(-1) is an optional scalar input that defaults to zero. Calculate Array Sums SGL Calculate sums of consecutive array elements. 0th element of output is equal to x(0)+ x(-1), where x(-1) is an optional scalar input that defaults to zero. Calculate Array Sums Calculate Peak Moments Calculate peak moments for an evenly sampled signal. 0th moment is the area under the peak i.e. the sum of the signals 1st moment is the location of the peak/centroid/center of mass. Calculated by sum(i*yi)/sum(yi), it's in units of the spacing between the signals, with 0 corresponding to the first element of the array. 2nd moment is the RMS peak width, also in index units. Find Negative Edge Search an array for a negative going zero crossing. Begin by searching backwards for a value above hysteresis value. Then search forwards for first value below zero. Find Zero Crossings Find the indices of points just after a zero crossing, searching either up or down in a waveform. Copyright: Alliant Techsystems Author: David A. Moore Mean Ignoring NaN Calculate the mean of all non-NaN values in the array. Remove DC Component DBL Subtract the mean from an array so the resulting array has a mean of 0. Remove DC Component SGL Subtract the mean from an array so the resulting array has a mean of 0. Remove DC Component Split Spectrum Filter Perform split-spectrum filtering on the input waveform. FFT, overlapping gaussian parts, inverse FFT, and weight original time sequence with mean sq/variance. Statistical Histogram Create a histogram based on +/-3 standard deviations and outliers. Sum Ignoring NaN Sum a 2-D array of SGL, treating NaN as zero. Zero Crossings Counter Counts zero crossings in the specified direction, using Noise Threshold to provide some hysteresis.