Contents
Getting Started with measure errors
Define error measures
Load PPF with measure errors
Manipulate measure errors
Plot signals with errors
 
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Tutorials
 JETDSP - Error signals

Process errors of a signal

It is possible to access and manipulate the errors associated with the signal.

Access error vectors

As with existing signal processing, the error vectors associated with the signal are callable using the name of the signal plus a suffix that depends of the error types and the dimension on which the error is defined.

Type
 Suffix
 Examples
1 - Symmetric
 signame_dimensionERRHI
signame_dimensionERRLO

where signame is the name of the signal and dimension could be Z, X or T
TI_ZERRHI
TI_ZERRLO
2 - Asymmetric
 signame_dimensionUPPER
signame_dimensionLOWER

where signame is the name of the signal and dimension could be Z, X or T 		CONC_ZUPPER
CONC_ZLOWER
3 - Radial
 signame_XERRHI
signame_XERRLO

where signame is the name of the signal. 		TI_XERRHI
TI_XERRLO


Setting error vectors


From the "Create processed signal" menu click "Set Errors" button.

create processed signal menu


  This will popup the "Define error values" menu.

Define error values menu


In each window it is possible to specify the values of the vector using an IDL expression or even other signals. It is also possible to specify the type of the error that it is going to be assigned as follow:
  • ABS - Type 2. The vectors specify the absolute values of the errors. They are completely independent of the data.
  • REL - Type 1. The vectors specify the delta values that will be respectively added and substracted to the data values.

For example assigning Z superior and inferior error equal to FINDGEN(10)*0.0+0.1 with type "Rel" will set the error values to 10% of the original signal data. The same result could be obtained assigning the  Z superior and inferior error equal respectively to signame*1.1 and signame*0.9 with type "Abs".

When completed press Apply and then Exit. The resulting string will be reported in the text field next to "Set Errors" button and in the IDL command. Note that it is not possible to edit the text field next to "Set Errors" button directly.