jpes.com> writes: > This step may happen once, it may happen several time, or it ma not > happen at all. >=20 > With all of that said, here is the question... >=20 > Is there a way to determine, using mathematical methods, if this step > dunction occured in a given file > without actually graphing the file and physically looking at it? >=20 Hi Jim,=20 This looks to be a statistical problem, so I owuld approach it from that.=20 The steps are: 1. Establish mean and std. deviation of "normal" signal.=20 2. In each file, check if there are values outside of mean +/- 3* stdev.=20 This will determine if there are steps in the output. Depending on signal characteristics, you might be able to use 4, or more, stdev, and improve noise in the screening. =20 3. You can also have plots of data with step(s) generated automatically.=20 I would implement these in either R or perl, both are sufficiently convenient and fast to handle a few thousand files. =20 If you would like more details/discussion, you are welcome to contact me of= f list. =20 Sergey Dryga http://beaglerobotics.com http://westernbiotech.us =20 --=20 http://www.piclist.com/techref/piclist PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist .