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# numpy.polynomial.laguerre.lagtrim

`numpy.polynomial.laguerre.``lagtrim`(c, tol=0)

  Remove “small” “trailing” coefficients from a polynomial.

  “Small” means “small in absolute value” and is controlled by the parameter tol; “trailing” means highest order coefficient(s), e.g., in `[0, 1, 1, 0, 0]` (which represents `0 + x + x**2 + 0*x**3 + 0*x**4`) both the 3-rd and 4-th order coefficients would be “trimmed.”

  Parameters: | c : array_like 1-d array of coefficients, ordered from lowest order to highest. tol : number, optional Trailing (i.e., highest order) elements with absolute value less than or equal to tol (default value is zero) are removed.
  Returns: | trimmed : ndarray 1-d array with trailing zeros removed. If the resulting series would be empty, a series containing a single zero is returned.
  Raises: | ValueError If tol < 0

  See also

  `trimseq`

  Examples

      >>> from numpy import polynomial as P
      >>> P.trimcoef((0,0,3,0,5,0,0))
      array([ 0.,  0.,  3.,  0.,  5.])
      >>> P.trimcoef((0,0,1e-3,0,1e-5,0,0),1e-3) # item == tol is trimmed
      array([ 0.])
      >>> i = complex(0,1) # works for complex
      >>> P.trimcoef((3e-4,1e-3*(1-i),5e-4,2e-5*(1+i)), 1e-3)
      array([ 0.0003+0.j   ,  0.0010-0.001j])