[Scipy-svn] r6897 - trunk/scipy/signal

scipy-svn@scip... scipy-svn@scip...
Sun Nov 14 14:52:47 CST 2010


Author: warren.weckesser
Date: 2010-11-14 14:52:47 -0600 (Sun, 14 Nov 2010)
New Revision: 6897

Modified:
   trunk/scipy/signal/waveforms.py
Log:
DEP: signal: Remove deprecated 'chirp' code (nonscalar 'f0' and 'qshape' keyword--see the 0.8.0 release notes).

Modified: trunk/scipy/signal/waveforms.py
===================================================================
--- trunk/scipy/signal/waveforms.py	2010-11-14 16:23:56 UTC (rev 6896)
+++ trunk/scipy/signal/waveforms.py	2010-11-14 20:52:47 UTC (rev 6897)
@@ -5,9 +5,8 @@
 #   Rewrote much of chirp()
 #   Added sweep_poly()
 
-import warnings
 from numpy import asarray, zeros, place, nan, mod, pi, extract, log, sqrt, \
-     exp, cos, sin, polyval, polyint, size, log10
+     exp, cos, sin, polyval, polyint
 
 def sawtooth(t, width=1):
     """
@@ -190,83 +189,9 @@
         return yI, yQ, yenv
 
 
-# This is chirp from scipy 0.7:
-
-def old_chirp(t, f0=0, t1=1, f1=100, method='linear', phi=0, qshape=None):
+def chirp(t, f0, t1, f1, method='linear', phi=0, vertex_zero=True):
     """Frequency-swept cosine generator.
 
-    Parameters
-    ----------
-    t : ndarray
-        Times at which to evaluate the waveform.
-    f0 : float or ndarray, optional
-        Frequency (in Hz) of the waveform at time 0.  If `f0` is an
-        ndarray, it specifies the frequency change as a polynomial in
-        `t` (see Notes below).
-    t1 : float, optional
-        Time at which `f1` is specified.
-    f1 : float, optional
-        Frequency (in Hz) of the waveform at time `t1`.
-    method : {'linear', 'quadratic', 'logarithmic'}, optional
-        Kind of frequency sweep.
-    phi : float
-        Phase offset, in degrees.
-    qshape : {'convex', 'concave'}
-        If method is 'quadratic', `qshape` specifies its shape.
-
-    Notes
-    -----
-    If `f0` is an array, it forms the coefficients of a polynomial in
-    `t` (see `numpy.polval`). The polynomial determines the waveform
-    frequency change in time.  In this case, the values of `f1`, `t1`,
-    `method`, and `qshape` are ignored.
-
-    This function is deprecated.  It will be removed in SciPy version 0.9.0.
-    It exists so that during in version 0.8.0, the new chirp function can
-    call this function to preserve the old behavior of the quadratic chirp.
-    """
-    warnings.warn("The function old_chirp is deprecated, and will be removed in "
-                    "SciPy 0.9", DeprecationWarning)
-    # Convert to radians.
-    phi *= pi / 180
-    if size(f0) > 1:
-        # We were given a polynomial.
-        return cos(2*pi*polyval(polyint(f0),t)+phi)
-    if method in ['linear','lin','li']:
-        beta = (f1-f0)/t1
-        phase_angle = 2*pi * (f0*t + 0.5*beta*t*t)
-    elif method in ['quadratic','quad','q']:
-        if qshape == 'concave':
-            mxf = max(f0,f1)
-            mnf = min(f0,f1)
-            f1,f0 = mxf, mnf
-        elif qshape == 'convex':
-            mxf = max(f0,f1)
-            mnf = min(f0,f1)
-            f1,f0 = mnf, mxf
-        else:
-            raise ValueError("qshape must be either 'concave' or 'convex' but "
-                "a value of %r was given." % qshape)
-        beta = (f1-f0)/t1/t1
-        phase_angle = 2*pi * (f0*t + beta*t*t*t/3)
-    elif method in ['logarithmic','log','lo']:
-        if f1 <= f0:
-            raise ValueError(
-                "For a logarithmic sweep, f1=%f must be larger than f0=%f."
-                % (f1, f0))
-        beta = log10(f1-f0)/t1
-        phase_angle = 2*pi * (f0*t + (pow(10,beta*t)-1)/(beta*log(10)))
-    else:
-        raise ValueError("method must be 'linear', 'quadratic', or "
-            "'logarithmic' but a value of %r was given." % method)
-
-    return cos(phase_angle + phi)
-
-
-def chirp(t, f0, t1, f1, method='linear', phi=0, vertex_zero=True,
-                                                            qshape=None):
-    """Frequency-swept cosine generator.
-
     In the following, 'Hz' should be interpreted as 'cycles per time unit';
     there is no assumption here that the time unit is one second.  The
     important distinction is that the units of rotation are cycles, not
@@ -291,10 +216,6 @@
         This parameter is only used when `method` is 'quadratic'.
         It determines whether the vertex of the parabola that is the graph
         of the frequency is at t=0 or t=t1.
-    qshape : str (deprecated)
-        If `method` is `quadratic` and `qshape` is not None, chirp() will
-        use scipy.signal.waveforms.old_chirp to compute the wave form.
-        This parameter is deprecated, and will be removed in SciPy 0.9.
 
     Returns
     -------
@@ -354,24 +275,7 @@
         f1 must be positive, and f0 must be greater than f1.
 
     """
-    if size(f0) > 1:
-        # Preserve old behavior for one release cycle; this can be
-        # removed in scipy 0.9.
-        warnings.warn("Passing a list of polynomial coefficients in f0 to the "
-                "function chirp is deprecated.  Use scipy.signal.sweep_poly.",
-                DeprecationWarning)
-        return old_chirp(t, f0, t1, f1, method, phi, qshape)
 
-    if method in ['quadratic', 'quad', 'q'] and qshape is not None:
-        # We must use the old version of the quadratic chirp.  Fortunately,
-        # the old API *required* that qshape be either 'convex' or 'concave'
-        # if the quadratic method was selected--`None` would raise an error.
-        # So if the code reaches this point, we should use the old version.
-        warnings.warn("The qshape keyword argument is deprecated.  "
-                "Use vertex_zero.", DeprecationWarning)
-        waveform = old_chirp(t, f0, t1, f1, method, phi, qshape)
-        return waveform
-
     # 'phase' is computed in _chirp_phase, to make testing easier.
     phase = _chirp_phase(t, f0, t1, f1, method, vertex_zero)
     # Convert  phi to radians.



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