Issue a warning for using gmx_rms -prev with large trajectories.

Refs #716.

Change-Id: I607d6a63259e0dd9de7c8c99e4917bbe9f37ff8e

diff --git a/src/tools/gmx_rms.c b/src/tools/gmx_rms.c
index 628ed7f0e49fac3ddf0387bc671a9421f8eb3db5..895bdb836e7719e1b0fde0a2418f1fb85ac74097 100644 (file)
--- a/src/tools/gmx_rms.c
+++ b/src/tools/gmx_rms.c
@@ -322,6 +322,8 @@ int gmx_rms(int argc, char *argv[])
     bPrev = (prev > 0);
     if (bPrev)
     {
+        fprintf(stderr, "WARNING: using option -prev with large trajectories will\n"
+                        "         require a lot of memory and could lead to crashes\n");
         prev = abs(prev);
         if (freq != 1)
         {