IDL Wavelet Toolkit User's Guide

Chapter 2: Using the IDL Wavelet Toolkit 23XstrideThe sampling interval along the first data dimension. The default is 1L.YoffsetThis long integer gives the offset along the second data dimension at which to start.The default is 0L.YcountThis long integer gives the number of data points to use along the second datadimension. The default is the size of the second dimension.YstrideThis long integer gives the sampling interval along the second data dimension. Thedefault is 1L.SourceThis string describes the original source or location of the data. The default is eitherthe full filename (if the data was from a file) or ’Imported’ (if the data was fromthe IDL> command prompt).NotesYou can enter miscellaneous information into the Notes string. The default is the null('') string.Mathematical ExpressionsFor Xstart, Dx, Ystart, and Dy, it is highly recommended that whenever possible youenter mathematical expressions, rather than converting to numbers. For example, inthe above table, the sampling rate for hello.wav is 22050 Hz. One could have enteredDx as 0.00004535 rather than ‘1d0/22050’. Nevertheless, the latter is not only moreaccurate (limited only by your computer’s precision) but is also much moreinformative. (Note that the ‘1d0’ forces the computation to be done in doubleprecision.)You may also enter IDL functions in these strings. For example, if your X coordinatewas in Julian days, starting from say 29 February 2000, you could setXstart = 'JULDAY(2,29,2000)'.IDL Wavelet ToolkitWavelet Toolkit Dataset Viewer