functions in demo1.i - e

    evolve, time1  
 or evolve, time1, time0  


Step the hydro calculation forward to TIME1,  
starting with the initial conditions in the  
RT, z, and v arrays at time TIME0 (default 0.0  
if omitted).  The calculation also depends on  
the constants M (mass/area/zone) and gammaM1  
(gamma-1 for the gamma-law equation of state).  
The pressure array p is updated in addition to  
the primary state arrays RT, z, and v.  
Boundary conditions are specified by setting  
either a boundary pressure or a boundary  
velocity at each end of the fluid column.  
bc0_v   - Boundary velocity at z(0), or []  
          if z(0) has pressure BC.  
bc0_p   - Boundary pressure beyond z(0).  
bc0_time  - If bc0_v or bc0_p is an array,  
            bc0_time is an array of the same  
            length specifying the corresponding  
            times for time dependent BCs.  
bc0_Z   - Acoustic impedance at z(0) if bc0_v  
          is nil (default is 0).  
bcN_v, bcN_p, bcN_time, and bcN_Z have the same  
meanings for the z(n_zones) boundary.  
The worker routines OutputResults and  
TakeStep must be supplied.  
Interpreted function, defined at i/demo1.i   line 119