qinit.f.html | |
Source file: qinit.f | |
Directory: /Users/rjl/clawpack_src/clawpack_master/apps/fvmbook/chap12/efix | |
Converted: Sat Mar 23 2024 at 11:05:50 using clawcode2html | |
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c c c ========================================================= subroutine qinit(meqn,mbc,mx,xlower,dx,q,maux,aux) c ========================================================= c c # Set initial conditions for q. 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 ql = -1.d0 qr = 2.d0 do 150 i=1,mx c # left and right edge of i'th cell: xl = xlower + (i-1)*dx xr = xl+dx if (xl .ge. 0.d0) then q(1,i) = qr else if (xr .le. 0.d0) then q(1,i) = ql else c # xl < 0 < xr and the cell average is weighted combo of ql,qr: q(1,i) = (-xl*ql + xr*qr) / dx endif 150 continue c return end