Random Number Generation

HRNDM1R= HRNDM1 (ID)

Action: Returns a random number distributed according to the contents of 1-dimensional histogram.

Input parameter:

ID

Identifier of an existing 1-dimensional histogram according to whose distribution random numbers have to be generated.

Remark:

• The first time HRNDM1 is called on a given histogram with identifier ID, the channel contents of the original histogram are replaced by the integrated channel contents, normalized to 1.
• The histogram ID must be booked with 1 bin/word (VMX=0)
• If the histogram ID does not exist, zero is returned
• If the histogram ID is empty, or if the sum of its channel contents is not positive, a message is printed and a flat distribution is assumed.

CALL HRNDM2 (ID,RX*,RY*)

Action: Returns a random point (RX, RY) distributed according to the contents of a 2-dimensional histogram.

Input parameter:

ID

Identifier of a 2-dimensional histogram

Output parameters

RX,RY

Random numbers.

Remark:

• Same as HRNDM1
• These 2 entries can be used in conjunction with HBFUN1 and HBFUN2 respectively.