>> help spm_filter
Removes low frequency confounds X0
FORMAT [Y] = spm_filter(K,Y)
FORMAT [K] = spm_filter(K)
K - filter matrix or:
K(s) - struct array containing partition-specific specifications
K(s).RT - observation interval in seconds
K(s).row - row of Y constituting block/partition s
K(s).HParam - cut-off period in seconds
K(s).X0 - low frequencies to be removed (DCT)
Y - data matrix
K - filter structure
Y - filtered data
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spm_filter implements high-pass filtering in an efficient way by
using the residual forming matrix of X0 - low frequency confounds
.spm_filter also configures the filter structure in accord with the
specification fields if called with one argument
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Copyright (C) 2005 Wellcome Department of Imaging Neuroscience
On 24/10/2007, at 13.19, Luijten, M. wrote:
Hi all,
I am wondering whether and how you can visualize the cosines added by SPM when you enter a high pass filter. Is it possible to actually see what spm did?
Thanks,
Maartje