TABRND1
Bulk Data Entry Defines power spectral density as a tabular function of frequency for use in random analysis. Referenced on the RANDPS entry.
Format
(1) | (2) | (3) | (4) | (5) | (6) | (7) | (8) | (9) | (10) |
---|---|---|---|---|---|---|---|---|---|
TABRND1 | ID | XAXIS | YAXIS | FLAT | |||||
f1 | g1 | f2 | g2 | f3 | g3 | f4 | g4 |
Example
(1) | (2) | (3) | (4) | (5) | (6) | (7) | (8) | (9) | (10) |
---|---|---|---|---|---|---|---|---|---|
TABRND1 | 3 | ||||||||
2.5 | .01057 | 2.6 | .01362 | ENDT | |||||
etc |
Definitions
Field | Contents | SI Unit Example |
---|---|---|
ID | Table identification
number. (Integer > 0) |
|
XAXIS | Specifies a linear or
logarithmic interpolation for the x-axis. 5
|
|
YAXIS | Specifies a linear or
logarithmic interpolation for the y-axis. 5
|
|
FLAT |
Specifies the handling method for y-values outside the specified
range of x-values in the table.
|
|
fi | Frequency value in cycles
per unit time. Must be in either ascending or descending order, but
not both. (Real > 0.0) |
|
gi | Power spectral
density. (Real) |
Comments
- Jumps between two points are allowed, but not at the end points.
- At least two entries must be present.
- Any f-g entry may be ignored by placing the BCD string SKIP in either of the two fields used for that entry.
- The end of the table is indicated by the existence of the BCD string ENDT in either of the two fields following the last entry. An error is detected if any continuations follow the entry containing the end-of-table flag ENDT.
- For
FLAT=0 (default),
TABRND1 mnemonic infers the use of the
algorithm:Where,
- Input to the table
- Is returned
The table look-up is performed using linear extrapolation outside the table using the last two end points at the appropriate table end. At jump points, the average is used. There are no error returns from this table look-up procedure.
For FLAT=1, the same algorithm as FLAT=0 is used, except that values outside the range are not extrapolated. The corresponding start or end point y-values are used for all y-values outside the range.