iFit/diff

PURPOSE

b = diff(s) : computes the difference long 1st axis of iData object

SYNOPSIS

function a = diff(a)

DESCRIPTION

 b = diff(s) : computes the difference long 1st axis of iData object

   @iData/diff function to compute the difference along rows, that is the 
     gradient for the 1st axis (rows).

 input:  s: object or array (iData)
 output: b: object or array (iData)
 ex:     b=diff(a);

 Version: Aug. 22, 2017
 See also iData, iData/gradient, iData/sum, iData/trapz, iData/jacobian

CROSS-REFERENCE INFORMATION

This function calls:

gradient g = gradient(a, dim) : computes the gradient (derivative) of iData objects

This function is called by:

cwt b = cwt(s,dim,scales,wname,'wname',...) : Continuous wavelet transform
fft c = fft(a) : computes the Discrete Fourier transform of iData objects
interp [b...] = interp(s, ...) : interpolate iData object
peaks [half_width, center, amplitude, baseline] = peaks(s, dim, m) : peak position and width of iData
subsasgn b = subsasgn(a,index,b) : iData indexed assignement