Waveform_Statistics calculation sub-routine, for use with the EPICS aSubRecord. This module allows the calculation of statistics of values extracted from multi-valued records such as a waveform, subArray or concat records.
The available values are
- mean
- minimum value
- maximum value
- standard deviation (based on sample variance)
- total
- median value
- least squares fit slope (m) as in y = m.x + c
- least squares fit intersect (c) as in y = m.x + c
- maximum absolute value
- standard deviation (based on population variance)
- total number of samples (integer)
The comments/documentation within the Waveform_Statistics_Subroutines.c file is extensive and should be read.
| processing | fucntion name |
|---|---|
| INAM | Waveform_Statistics_Init |
| SNAM | Waveform_Statistics_Process |
| field | FTx | NOx | Comment |
|---|---|---|---|
| INPA | DOUBLE | array size | Input values |
| INPB | LONG | 1 | Number of elements to be processes (must be > 0) |
| INPC | LONG | 1 | Data offset - must be >= 0 and < NOA. |
| INPD | DOUBLE | 1 | Sample interval - defaults to 1.0 if input not DOUBLE |
| INPE | LONG | 1 | Input mask. LSB defines mask value - other bits ignored (optional) |
| field | FTVx | NOVx | Comment |
|---|---|---|---|
| OUTA | DOUBLE | 1 | mean |
| OUTB | DOUBLE | 1 | minimum |
| OUTC | DOUBLE | 1 | maximum |
| OUTD | DOUBLE | 1 | standard deviation (based on sample variance) |
| OUTE | DOUBLE | 1 | total |
| OUTF | DOUBLE | 1 | median |
| OUTG | DOUBLE | 1 | least squares fit slope |
| OUTH | DOUBLE | 1 | least squares fit intersect |
| OUTI | DOUBLE | 1 | maximum absolute value |
| OUTJ | DOUBLE | 1 | root mean square (RMS) value |
| OUTK | DOUBLE | 1 | standard deviation (based on population variance) |
| OUTL | LONG | 1 | number of elements used |
Notes:
- acutal number of elements used to calculate the statistics taking into account INPB, INPC and INPE.
Last updated: Wed Sep 11 13:45:03 AEST 2024