RANDBIT

Description

Generates a bitmap mask that can be used for random sampling. A bitmap is generated with a specified bit density. The bitmap may be based on a subsample of an existing bitmap, or on a sample of the whole image space.

Parameters

Name	Type	Length	Value range
InputBitmap1: Input bitmap segment	bitmap port	0 - 1024
OutputBitmap1: Output bitmap segment	Bitmap port	0 - 1024
Random Sampling Density *	Float	1 - 1	0 - 100
Bitmap Layer Name	String	0 -	Default: RANDMASK
Bitmap Layer Description	String	0 -

* Required parameter

Parameter descriptions

InputBitmap1: Input bitmap segment

Specifies the image bitmaps to serve as sample masks for the output bitmaps.

Duplicate segments are allowed.

OutputBitmap1: Output bitmap segment

Specifies the output bitmap to receive the sample results.

The output bitmap may be the same as the input bitmap; if this parameter is not specified, new bitmap segments are created.

Duplicate bitmap segments are NOT allowed.

Random Sampling Density

Specifies the density, in percentage, at which to sample the output bitmap mask.

If set to 100 (percent), the output bitmap will be 1 (all pixels on) everywhere the input bitmap is 1 (or everywhere, if there is no input bitmap). If set to 50, approximately half the output bits will be 1.

Bitmap Layer Name

Specifies a name (up to 8 characters) for the output bitmap segment. If this parameter is not specified, the default name RANDMASK is used.

Bitmap Layer Description

Describes (in up to 64 characters) the contents or origins of the output neural network segment.

Details

RANDBIT generates a mask to be used for random sampling. An output bitmap suitable for use with other "maskable" functions is generated, based on a specified sampling density (DENSITY) and an input bitmap mask (DBIB).

The input bitmap parameter (DBIB) specifies the input masks from which to compute a sub-sample space. If an input bitmap is not provided, the entire image space will be sampled.

References

Law & Kelton, "Simulation Modelling and Analysis", P449.