# src/2d/equations/euler/rp/flgout2eu.f

```c
c     ==========================================================
subroutine flgout2eu(q,mx,my,lb,ub,qo,mxo,myo,lbo,ubo,
&     lbr,ubr,shaper,meqn,nc,t)
c     ==========================================================
c
c     # Computes primitives for Euler equations for output
c     # and flagging.
c
c     # Copyright (C) 2002 Ralf Deiterding
c     # Brandenburgische Universitaet Cottbus
c
c     # Copyright (C) 2003-2007 California Institute of Technology
c     # Ralf Deiterding, ralf@amroc.net
c
implicit double precision(a-h,o-z)
common /param/  gamma,gamma1
common /PhysData/  Wk, RU, PA
c
integer meqn, mx, my, mxo, myo
dimension q(meqn,mx,my), qo(mxo,myo)
c
integer  lb(2), ub(2), lbo(2), ubo(2), lbr(2), ubr(2), shaper(2),
&     mresult, stride, imin(2), imax(2), i, getindx, d
c
stride = (ub(1) - lb(1))/(mx-1)
do 5 d = 1, 2
imin(d) = max(lb(d), lbr(d))
imax(d) = min(ub(d), ubr(d))

if (mod(imin(d)-lb(d),stride) .ne. 0) then
imin(d) = imin(d) + stride - mod(imin(d)-lb(d),stride)
endif
imin(d) = getindx(imin(d), lb(d), stride)

if (mod(imax(d)-lb(d),stride) .ne. 0) then
imax(d) = imax(d) - mod(imax(d)-lb(d),stride)
endif
imax(d) = getindx(imax(d), lb(d), stride)
5    continue

do 10 i = imin(1), imax(1)
do 10 j = imin(2), imax(2)
c           # Density
if (nc.eq.1) qo(i,j) = q(1,i,j)
c           # Velocity u
if (nc.eq.2) qo(i,j) = q(2,i,j)/q(1,i,j)
c           # Velocity v
if (nc.eq.3) qo(i,j) = q(3,i,j)/q(1,i,j)
c           # Total energy density
if (nc.eq.4) qo(i,j) = q(4,i,j)
c           # Temperature
if (nc.eq.5) qo(i,j) = (Wk*gamma1*(q(4,i,j) - 0.5d0*
&        (q(2,i,j)**2+q(3,i,j)**2)/q(1,i,j)))/(RU*q(1,i,j))
c           # Pressure
if (nc.eq.6) qo(i,j) = gamma1*(q(4,i,j) - 0.5d0*
&        (q(2,i,j)**2+q(3,i,j)**2)/q(1,i,j))
c           # Gamma
if (nc.eq.7) qo(i,j) = gamma
10   continue

return
end
```

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