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Is there a test that turns off the filtering if an invalid value is found in that field? In signal processing, saying that a filter has an infinite impulse response means that it is an IIR filter as opposed to an FIR filter, which would imply other properties of the coefficients of the difference equation. It would be better for software to have a different means of turning off high pass filtering, rather than Inf, which has a theoretical meaning. Linda Seltzer UC Davis > Allison > > I tried setting it in the batch interface and it appears to work fine. > Inf > is accepted as a value and the resulting SPM.mat file has a field > SPM.xX.K.HParam = Inf. The SPM.xX.K.X0 field has size 175x0 (I have 175 > scans in my dataset), but it is empty. It also estimates properly. > > Where were you trying to do this in the GUI? > > > by the way your email client seems to send multiple messages to the list. > > Darren > > > -----Original Message----- > > From: SPM (Statistical Parametric Mapping) > > [mailto:[log in to unmask]] On Behalf Of Allison Nugent > > Sent: Tuesday, April 08, 2008 6:06 PM > > To: [log in to unmask] > > Subject: [SPM] High Pass Filter in SPM5 > > > > Hello all, > > > > I'm trying to turn off the high pass filter in SPM5 (for > > reasons too complex to get into; I know it's generally a bad > > idea). I've read the archives, and this seems to be done by > > setting the period from 128 to Inf. > > However, there is no way to do this (that I could find) > > through the SPM5 GUI. Am I right in thinking that I can just > > create my SPM.mat, then change SPM.xX.K.HParam to Inf, and > > that will turn off the filtering, even though the cosines > > remain in SPM.xX.K.x0? > > > > Thanks! > > > > Allison > > > > > > -------------------------------------------------------------- > > ------------ > > CONFIDENTIALITY NOTICE: This e-mail message, including any > > attachments, is for the sole use of the intended > > recipient(s) and may contain confidential, proprietary, > > and/or privileged information protected by law. If you are > > not the intended recipient, you may not use, copy, or > > distribute this e-mail message or its attachments. If you > > believe you have received this e-mail message in error, > > please contact the sender by reply e-mail and destroy all > > copies of the original message > > > > > > -------------------------------------------------------------- > > ------------ > > CONFIDENTIALITY NOTICE: This e-mail message, including any > > attachments, is for the sole use of the intended > > recipient(s) and may contain confidential, proprietary, > > and/or privileged information protected by law. If you are > > not the intended recipient, you may not use, copy, or > > distribute this e-mail message or its attachments. If you > > believe you have received this e-mail message in error, > > please contact the sender by reply e-mail and destroy all > > copies of the original message > > >