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106 lines
3.4 KiB
ReStructuredText
Executable file
106 lines
3.4 KiB
ReStructuredText
Executable file
=========================
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NumPy 1.5.0 Release Notes
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=========================
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Plans
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=====
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This release has the following aims:
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* Python 3 compatibility
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* :pep:`3118` compatibility
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Highlights
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==========
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New features
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============
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Warning on casting complex to real
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~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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Numpy now emits a `numpy.ComplexWarning` when a complex number is cast
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into a real number. For example:
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>>> x = np.array([1,2,3])
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>>> x[:2] = np.array([1+2j, 1-2j])
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ComplexWarning: Casting complex values to real discards the imaginary part
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The cast indeed discards the imaginary part, and this may not be the
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intended behavior in all cases, hence the warning. This warning can be
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turned off in the standard way:
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>>> import warnings
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>>> warnings.simplefilter("ignore", np.ComplexWarning)
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Dot method for ndarrays
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~~~~~~~~~~~~~~~~~~~~~~~
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Ndarrays now have the dot product also as a method, which allows writing
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chains of matrix products as
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>>> a.dot(b).dot(c)
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instead of the longer alternative
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>>> np.dot(a, np.dot(b, c))
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linalg.slogdet function
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~~~~~~~~~~~~~~~~~~~~~~~
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The slogdet function returns the sign and logarithm of the determinant
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of a matrix. Because the determinant may involve the product of many
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small/large values, the result is often more accurate than that obtained
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by simple multiplication.
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new header
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~~~~~~~~~~
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The new header file ndarraytypes.h contains the symbols from
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ndarrayobject.h that do not depend on the PY_ARRAY_UNIQUE_SYMBOL and
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NO_IMPORT/_ARRAY macros. Broadly, these symbols are types, typedefs,
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and enumerations; the array function calls are left in
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ndarrayobject.h. This allows users to include array-related types and
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enumerations without needing to concern themselves with the macro
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expansions and their side- effects.
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Changes
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=======
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polynomial.polynomial
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---------------------
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* The polyint and polyder functions now check that the specified number
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integrations or derivations is a non-negative integer. The number 0 is
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a valid value for both functions.
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* A degree method has been added to the Polynomial class.
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* A trimdeg method has been added to the Polynomial class. It operates like
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truncate except that the argument is the desired degree of the result,
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not the number of coefficients.
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* Polynomial.fit now uses None as the default domain for the fit. The default
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Polynomial domain can be specified by using [] as the domain value.
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* Weights can be used in both polyfit and Polynomial.fit
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* A linspace method has been added to the Polynomial class to ease plotting.
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polynomial.chebyshev
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--------------------
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* The chebint and chebder functions now check that the specified number
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integrations or derivations is a non-negative integer. The number 0 is
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a valid value for both functions.
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* A degree method has been added to the Chebyshev class.
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* A trimdeg method has been added to the Chebyshev class. It operates like
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truncate except that the argument is the desired degree of the result,
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not the number of coefficients.
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* Chebyshev.fit now uses None as the default domain for the fit. The default
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Chebyshev domain can be specified by using [] as the domain value.
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* Weights can be used in both chebfit and Chebyshev.fit
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* A linspace method has been added to the Chebyshev class to ease plotting.
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histogram
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---------
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After a two years transition period, the old behavior of the histogram function
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has been phased out, and the "new" keyword has been removed.
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