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"{ Encoding: utf8 }"
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COPYRIGHT (c) 2018 by Claus Gittinger
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All Rights Reserved
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This software is furnished under a license and may be used
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only in accordance with the terms of that license and with the
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inclusion of the above copyright notice. This software may not
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be provided or otherwise made available to, or used by, any
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other person. No title to or ownership of the software is
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hereby transferred.
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"
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"{ Package: 'stx:libbasic2' }"
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"{ NameSpace: Smalltalk }"
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AbstractNumberVector variableDoubleSubclass:#ComplexDoubleArray
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instanceVariableNames:''
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classVariableNames:''
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poolDictionaries:''
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category:'Collections-Arrayed'
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!
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!ComplexDoubleArray class methodsFor:'documentation'!
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copyright
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"
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COPYRIGHT (c) 2018 by Claus Gittinger
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All Rights Reserved
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This software is furnished under a license and may be used
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only in accordance with the terms of that license and with the
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inclusion of the above copyright notice. This software may not
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be provided or otherwise made available to, or used by, any
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other person. No title to or ownership of the software is
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hereby transferred.
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"
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!
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documentation
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"
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ComplexDoubleArrays store complex numbers (in double prevision) and nothing else.
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They have been added to support heavy duty number crunching and
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data exchange with openGL frameworks and other mass data libraries
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somewhat better than other smalltalks do.
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Storing Complex numbers in these objects (instead of Arrays)
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has some benefits:
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1) since the values are stored directly (instead of pointers to them)
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both access overhead and garbage collect overhead is minimized.
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2) they can be much faster passed to c functions (such as graphics
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libraries or heavy duty math packages), since the double values
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come packed and can be used in C by using a (double *) or double[].
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There is no need to loop over the array extracting doubles.
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3) they could (in theory) be much more easily be processed by things like
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vector and array processors
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Be aware however, that ComplexDoubleArrays are not supported in other
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smalltalks - your program will thus become somewhat less portable.
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(since their protocol is the same as normal arrays filled with floats,
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they can of course be easily simulated - a bit slower though)
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However, they could be simulated by a ByteArray, using doubleAt: and
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doubleAtPut: messages to access the elements, but that seems a bit
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clumsy and unelegant. Also, the stc-compiler may learn how to deal
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with Float- and DoubleArrays, making accesses very fast in the future.
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Hint: if you use doubleArrays in your application and must port it
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to some other smalltalk, define a DoubleArray class there, which is derived
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from ByteArray, and add access methods.
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Of course, ComplexDoubleArrays can be subclassed,
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and named instance variables can be added there.
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[memory requirements:]
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OBJ-HEADER + (size * double-size * 2)
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[See also:]
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ComplexFloatArray DoubleArray FloatArray Array
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[author:]
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Claus Gittinger
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"
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!
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examples
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"
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[exBegin]
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|vec|
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vec := ComplexDoubleArray new:4.
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vec size.
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vec at:1.
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vec at:2.
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vec at:3.
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vec at:4.
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vec at:1 put:(1 + 4i).
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vec at:2 put:(2 + 4i).
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vec at:4 put:(4 + 4i).
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vec
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[exEnd]
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"
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! !
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!ComplexDoubleArray class methodsFor:'instance creation'!
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new:size
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^ super new:(size * 2)
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! !
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!ComplexDoubleArray class methodsFor:'queries'!
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elementByteSize
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"for bit-like containers, return the number of bytes stored per element.
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Here, 2*8 is returned"
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^ 16
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! !
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!ComplexDoubleArray methodsFor:'accessing'!
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at:index
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|baseIdx|
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baseIdx := index * 2.
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^ Complex basicNew
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setReal:(self basicAt:(baseIdx - 1))
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setImaginary:(self basicAt:(baseIdx))
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!
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at:index put:aComplex
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|baseIdx|
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baseIdx := index * 2.
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self basicAt:(baseIdx - 1) put:aComplex real.
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self basicAt:(baseIdx) put:aComplex imaginary.
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!
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at:index put:realPart i:imaginaryPart
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|baseIdx|
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baseIdx := index * 2.
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self basicAt:(baseIdx - 1) put:realPart.
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self basicAt:(baseIdx) put:imaginaryPart.
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!
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imaginaryAt:index
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|baseIdx|
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baseIdx := index * 2.
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^ (self basicAt:(baseIdx))
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!
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realAt:index
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|baseIdx|
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baseIdx := index * 2.
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^ (self basicAt:(baseIdx - 1))
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! !
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!ComplexDoubleArray methodsFor:'queries'!
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defaultElement
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^ Complex zero
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!
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isValidElement:anObject
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"return true, if I can hold this kind of object"
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^ anObject isNumber
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!
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size
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^ super size // 2
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! !
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!ComplexDoubleArray class methodsFor:'documentation'!
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version
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^ '$Header$'
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!
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version_CVS
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^ '$Header$'
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! !
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