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| -rw-r--r-- | numpy/lib/function_base.py | 8 |
1 files changed, 4 insertions, 4 deletions
diff --git a/numpy/lib/function_base.py b/numpy/lib/function_base.py index b8ae9a470..3a5ad26a6 100644 --- a/numpy/lib/function_base.py +++ b/numpy/lib/function_base.py @@ -3562,14 +3562,16 @@ def sinc(x): r""" Return the normalized sinc function. - The sinc function is :math:`\sin(\pi x)/(\pi x)`. + The sinc function is equal to :math:`\sin(\pi x)/(\pi x)` for any argument + :math:`x\ne 0`. ``sinc(0)`` takes the limit value 1, making ``sinc`` not + only everywhere continuous but also analytic. .. note:: Note the normalization factor of ``pi`` used in the definition. This is the most commonly used definition in signal processing. Use ``sinc(x / np.pi)`` to obtain the unnormalized sinc function - :math:`\sin(x)/(x)` that is more common in mathematics. + :math:`\sin(x)/x` that is more common in mathematics. Parameters ---------- @@ -3584,8 +3586,6 @@ def sinc(x): Notes ----- - ``sinc(0)`` is the limit value 1. - The name sinc is short for "sine cardinal" or "sinus cardinalis". The sinc function is used in various signal processing applications, |