IC89789: NOISY DATA IN SPECTRUM OUTPUT FROM FFT OPERATOR FOR LARGE DATA SETS

 

APAR status

  • Closed as program error.

Error description

  • When you have an SPL application that uses an FFT operator and
    the algorithm parameter is set to complexFFT, realFFT,
    inverseRealFFT, or inverseComplexFFT,  noisy data or unwanted
    artifacts are visible in the output spectrum.   This problem is
    more likely to occur when the input data set is large.
    The problem does not occur when the algorithm parameter is set
    to realDFT.
    

Local fix

  • You can work around the problem by setting the algorithm
    parameter to realDFT, but this algorithm has less accurate
    results, particularly when compared to complexFFT and
    inverseComplexFFT.
    

Problem summary

  • See Error Description.
    

Problem conclusion

  • This problem is fixed in Version 3.0 Fix Pack 1 and later fix
    packs.
    

Temporary fix

Comments

APAR Information

  • APAR number

    IC89789

  • Reported component name

    INFOSPHERE STRE

  • Reported component ID

    5724Y95IS

  • Reported release

    300

  • Status

    CLOSED PER

  • PE

    NoPE

  • HIPER

    NoHIPER

  • Special Attention

    NoSpecatt

  • Submitted date

    2013-01-23

  • Closed date

    2013-02-06

  • Last modified date

    2013-02-06

  • APAR is sysrouted FROM one or more of the following:

  • APAR is sysrouted TO one or more of the following:

Modules/Macros

  • FFT
    

Fix information

  • Fixed component name

    INFOSPHERE STRE

  • Fixed component ID

    5724Y95IS

Applicable component levels

  • R300 PSY

       UP

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Document information


More support for:

InfoSphere Streams

Software version:

3.0

Reference #:

IC89789

Modified date:

2013-02-06

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