However there are cases when these are not what is required. Some of these can be used to remove bad points, see here and here for some that can be implemented within the Simple signal processing dialog. IDL has many useful signal processing routines built in. Use both a rectangular and triangular window and compare the results.
Smooth LIDR/NE by one point in the radial direction and one point in the time direction. The window can be of rectangular shape or triangular shape and can be of any width. This window can be based on either indices or values. Smoothing in JETDSP works by smoothing points within a user-defined window. Many signals have noise and this can cause problems, this can be improved by smoothing. Assuming the signals RFCR1,2,3 correspond to Sequences 363,4,5 respectively ĭata transpose(,]) In this example all the signals share a common second axis and hence these can be merged using IDL array concatenation. Note that this method will work for slices not on the same axes since they will be interpolated onto a common axis. Save the signals as LHCD/JPSI and LHCD/PPSI under your userid. Plot the resultant signals as surfaces. Alter the expression to join the third slice to the two other slices. Alter this expression to join the first two RFCR slices together, note that there is no X vector for these signals, but they have a Time vector. Copy the IDL expression used into the second field of the IDL expression dialog. Bring up the simple expression dialog and display the 3D merge expression. Each of these correspond to a given time point. Read the private PPF signals LHCR/RFCR and LHCR/DSPE for uid=ybar and the following sequences. For example there are expressions for merging two 2D signals to produce a new 2D signal, but there is not an expression to merge two 2D signals to produce a 3D signal. In these cases the IDL expression can be used to perform the tasks. In some cases the simple signal processing expressions do not do everything that is required. Merging without using the simple expressions (An intermediate signal processing step in required.) Construct a signal plotting TI against RCOR only for the valid points using IDL expressions. CXSM/TI for pulse 53521 goes to zero at the wrong place and hence the last point for each timeslice is wrong. The signal CXSM/RCOR contains the corrected radii, but the first point for each timeslice is sometimes invalid. F is the first four timeslices, and F contains all timeslices from the sixth to the end. 3D signals are stored as F(t,x) so F is the first timeslice. It is possible to remove slices using just IDL expressions. Plot the merged signal and the original signal on separate plots and compare. Now use the 'Merge(t)' operation to join these two parts back together. Enter the parameters see here for details, and remembering to give the signal a name create two signals, one with all the data before the problem timeslice and one with the data afterwards. Select 'Subset(t)' and the signal to subset. These are the operations possible on profile data. Using the signal processing dialog select 'Simple Expression' and set the 'Type of Processing' to f(t,x). Using this directly in TRANSP could cause an error, so this timeslice needs to be removed. Note that near 45s all the values go to zero due toĪn error in the data. Two of the most commonly used expressions within these are the Subset and Merge options. The Simple Expressions part of the Signal Processing dialog allows shortcuts to commonly used expressions. Subset and Merge using 'Simple' Expressions. #Idl interpol how to#
For information about how to perform individual tasks see the This tutorial introduces the main tasks required for preparing data for TRANSP runs. Using JETDSP it is possible to perform a large number of signal processing tasks.
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