qinit.f.html CLAWPACK  
 Source file:   qinit.f
 Directory:   /home/rjl/git/rjleveque/clawpack-4.x/apps/acoustics/2d/example1/1drad
 Converted:   Tue Jul 26 2011 at 12:58:48   using clawcode2html
 This documentation file will not reflect any later changes in the source file. 

 
c
c
c =========================================================
       subroutine qinit(maxmx,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(1-mbc:maxmx+mbc, meqn)
      dimension aux(1-mbc:maxmx+mbc, *)
c
      pi = 4.d0*datan(1.d0)
      width = 0.2d0
c
      do 150 i=1,mx
	 xcell = xlower + (i-0.5d0)*dx
	 if (dabs(xcell-0.5d0) .le. width) then
	     pressure = 1.d0 + dcos(pi*(xcell - 0.5d0)/width)
	   else
	     pressure = 0.d0
	   endif
	 q(i,1) = pressure
	 q(i,2) = 0.d0
  150    continue
c
      return
      end