tfix typo, thanks A Dinesh - simple_DEM - a simple 2D Discrete Element Method code for educational purposes
 (HTM) git clone git://src.adamsgaard.dk/simple_DEM
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       ---
 (DIR) commit 43cadd7458e7c197e0d23677754084b11679d157
 (DIR) parent 15e7e030d19d71c7f137b498f6c52fa1c4317d0e
 (HTM) Author: Anders Damsgaard Christensen <adc@geo.au.dk>
       Date:   Sat, 20 Aug 2016 14:00:14 -0700
       
       fix typo, thanks A Dinesh
       
       Diffstat:
         M grains.c                            |       2 +-
       
       1 file changed, 1 insertion(+), 1 deletion(-)
       ---
 (DIR) diff --git a/grains.c b/grains.c
       t@@ -50,7 +50,7 @@ void interparticle_force(grain* g, int a, int b)
              yt = xn;
        
              /* Compute the velocity of the contact */
       -      double vx_ab = g[a].vx - g[b].vy;
       +      double vx_ab = g[a].vx - g[b].vx;
              double vy_ab = g[a].vy - g[b].vy;
              vn = vx_ab*xn + vy_ab*yn;
              vt = vx_ab*xt + vy_ab*yt - (g[a].R*g[a].angv + g[b].R*g[b].angv);