qinit.f.html
Source file:   qinit.f
Directory:   /Users/rjl/clawpack_src/clawpack_master/apps/fvmbook/chap3/acousimple
Converted:   Sat Mar 23 2024 at 11:04:21   using clawcode2html
This documentation file will not reflect any later changes in the source file.

 
c
c
c =========================================================
       subroutine qinit(meqn,mbc,mx,xlower,dx,q,maux,aux)
c =========================================================
c
c     # Set initial conditions for q.
c     # Pulse in pressure, zero velocity
c
c
      implicit double precision (a-h,o-z)
      dimension q(meqn,1-mbc:mx+mbc)
      dimension aux(maux,1-mbc:mx+mbc)
c
c
      do i=1,mx
         xcell = xlower + (i-0.5d0)*dx
         q(1,i) = 0.5d0*dexp(-80.d0*xcell**2)
         if (dabs(xcell+0.2d0) .lt. 0.1d0)  then
	        q(1,i) = q(1,i) + 0.5d0
	     endif
	  q(2,i) = 0.d0
      enddo
c
      return
      end