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> We are looking to apply a digital filtering approach to a stage of our > smurf based ORAC-DR pipeline, as this has proven advantageous in related > experiments with IDL. We're wondering if there are one dimensional > convolution routines available in Starlink that do not use FFT. If so, > any documentation and examples would be most helpful. Hello, Are you looking for a library or an actual application? And what kind of filter do you have in mind? There are boxcar and tophat filters in smurf/libsmf. In terms of applications there are BLOCK and GAUSMOOTH in KAPPA for example. Best regards, Graham