add interp2d() for fast bilinear 2D interpolation

1 files changed, 1 insertions, 0 deletions

diff --git a/src/misc.h b/src/misc.h
index 80a580f..3a55c2f 100644
--- a/src/misc.h
+++ b/src/misc.h
@@ -17,6 +17,7 @@ double ln(unsigned int n);
 double lnfact(unsigned int n);
 double kahan_sum(double *x, size_t n);
 double interp1d(double x, double *xp, double *yp, size_t n);
+double interp2d(double x, double y, double *xp, double *yp, double *zp, size_t n1, size_t n2);
 int isclose(double a, double b, double rel_tol, double abs_tol);
 int allclose(double *a, double *b, size_t n, double rel_tol, double abs_tol);
 double logsumexp(double *a, size_t n);