ISIM Statements and Functions

Integrates X with respect to time with Y=Y0 at time T=0. Must be in the dynamic section 

Returns a pseudo-random number in Y in the range 0 to 1. X is the seed for the random number generator Natural logarithm X must be positive  

Variables defined as CONSTANT may be modified interactively via the VAL command. 

The values of all variables are reset to the values defined in the INITIAL section. 

A simulation can be stopped at any point by the INTERACT command, for instance when a variable exceeds a certain value. The user can then change the values of any variables by the VAL command as described in section 4. 

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