Spot operator: opConvolve Spot Home Page
opConvolve
 opConvolve   One and two dimensional convolution operator.
 
    opConvolve(M,N,KERNEL,OFFSET,MODE) creates an operator for one or
    two-dimensional convolution, depending on the size of the KERNEL,
    and the matrix or vector (MxN) the convolution is applied to. The
    convolution is one dimensional only if KERNEL is a column vector
    and N=1, or KERNEL is a row vector and M=1. The OFFSET parameter
    determines the center of the KERNEL and has a default value of
    [1,1]. When the OFFSET lies outside the size of the KERNEL, the
    KERNEL is embedded in a zero matrix/vector with appropriate
    center. For one-dimensional convolution, KERNEL may be a
    scalar. Specifying an offset that is not equal to one where the
    corresponding size of the kernel does equal one leads to the
    construction of a two-dimensional convolution operator. There are
    three types of MODE:
  
    MODE = 'regular'   - convolve input with kernel;
           'truncated' - convolve input with kernel, but keep only
                         those MxN entries in the result that
                         overlap with the input;
           'cyclic'    - do cyclic convolution of the input with a
                         kernel that is wrapped around as many
                         times as needed.
 
    The output of the convolution operator, like all other
    operators, is in vector form.