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NI-DSP Analysis VI Reference 
Chapter 2
Part 3:  NI-DSP Function Reference 
2-85 NI-DSP SRM for LabVIEW for Windows
DSP Zero Padder
Pads the input array with zero from
starting index to the end of the input array.
This VI is useful when the size of the
acquired data buffers is not a power of two
and you want to take advantage of fast
processing algorithms in the analysis VIs.
These algorithms include Fourier
transforms, power spectrum, and fast Hartley transforms, which are extremely efficient for buffer sizes that are a
power of two.
X is a DSP Handle Cluster that indicates the memory buffer on the DSP board that contains the input
signal array.
Note: The operation is performed in place and the input array X is overwritten by the output Zero
Padded {X}.
starting index is the index from which the input array is padded with zero.  starting index defaults to 0.
Zero Padded {X} is a DSP Handle Cluster that is identical to {X}, but with the zero-padded array
already stored in the memory buffer on the DSP board.
error in (no error) contains the error information from a previous VI.  If an error occurs, it is passed out
error out and no other calls are made.
error out contains the error information for this call.