TABRND1

Bulk Data Entry

TABRND1 – Power Spectral Density Table

Description

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	blank	blank	blank	blank	blank
	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.

Field	Contents
ID	Table identification number. (Integer > 0)
XAXIS	Specifies a linear or logarithmic interpolation for the x-axis. See comment 6. Default = LINEAR (LINEAR or LOG)
YAXIS	Specifies a linear or logarithmic interpolation for the y-axis. See comment 6. Default = LINEAR (LINEAR or LOG)
fi	Frequency value in cycles per unit time. (Real > 0.0)
gi	Power Spectral Density. (Real)

Comments

The fi must be in either ascending or descending order, but not both.
Jumps between two points ( $image\tabrnd1_eq1.gif$ ) 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 field 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".
The TABRND1 mnemonic infers the use of the algorithm

$image\tabrnd1_eq2.gif$

where F is input to the table and G is returned. The table look-up $image\tabrnd1_eq3.gif$ is performed using linear extrapolation outside the table using the last two end points at the appropriate table end. At jump points, the average $image\tabrnd1_eq4.gif$ is used. There are no error returns from this table look-up procedure.

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Guidelines for Bulk Data Entries

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