Only store u[kx,ky] with kx>=0

1 files changed, 4 insertions, 0 deletions

diff --git a/src/navier-stokes.h b/src/navier-stokes.h
index 582212a..d100f44 100644
--- a/src/navier-stokes.h
+++ b/src/navier-stokes.h
@@ -52,6 +52,10 @@ double compute_enstrophy( _Complex double* u, int K1, int K2, double L);
 
 // get index for kx,ky in array of size S
 int klookup( int kx, int ky, int S1, int S2);
+// get index for kx,ky in array of size K1,K2 in which only the terms with kx>=0 are stored
+int klookup_sym( int kx, int ky, int K2);
+// get u_{kx,ky} from a vector u in which only the values for kx>=0 are stored, assuming u_{-k}=u_k^*
+_Complex double getval_sym( _Complex double* u, int kx, int ky, int K2);
 
 #endif