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# numpy.polynomial.laguerre.lagtrim

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```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(more...)
```

```        def trimcoef(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

--------
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])

"""
if tol < 0 :
raise ValueError("tol must be non-negative")

[c] = as_series([c])
[ind] = np.where(np.abs(c) > tol)
if len(ind) == 0 :
return c[:1]*0
else :
return c[:ind[-1] + 1].copy()
```

```def trim(x) :
return lag.lagtrim(x, tol=1e-6)

class TestConstants(TestCase) :
```
```
# Test results
assert_equal(lag.lagtrim(coef), coef[:-1])
assert_equal(lag.lagtrim(coef, 1), coef[:-3])
assert_equal(lag.lagtrim(coef, 2), [0])
```

```def trim(x) :
return lag.lagtrim(x, tol=1e-6)

class TestConstants(TestCase) :
```
```
# Test results
assert_equal(lag.lagtrim(coef), coef[:-1])
assert_equal(lag.lagtrim(coef, 1), coef[:-3])
assert_equal(lag.lagtrim(coef, 2), [0])
```