--- a/NEWS	Fri Feb 20 05:49:07 2015 -0500
+++ b/NEWS	Fri Feb 20 08:13:24 2015 -0800
@@ -44,6 +44,11 @@
     the dimension of "x". The old behaviour of "ismatrix" is obtained by
     "isnumeric (x) || islogical (x) || ischar (x)".
 
+ ** The nextpow2 function behaviour has been changed for vector inputs.
+    Instead of computing `nextpow2 (length (x))', it will now compute
+    nextpow2() for each element of the input.  Not only is this change
+    Matlab compatible, it also prevents bugs for "vectors" of length 1.
+
  ** The preference
 
       do_braindead_shortcircuit_evaluation

--- a/scripts/general/nextpow2.m	Fri Feb 20 05:49:07 2015 -0500
+++ b/scripts/general/nextpow2.m	Fri Feb 20 08:13:24 2015 -0800
@@ -18,7 +18,10 @@
 
 ## -*- texinfo -*-
 ## @deftypefn {Function File} {} nextpow2 (@var{x})
-## If @var{x} is a scalar, return the first integer @var{n} such that
+## Compute exponent for smallest power of two larger than input.
+##
+## For each element in the input array @var{x}, returns the first integer
+## @var{n} such that
 ## @tex
 ## $2^n \ge |x|$.
 ## @end tex
@@ -26,7 +29,6 @@
 ## 2^n @geq{} abs (x).
 ## @end ifnottex
 ##
-## If @var{x} is a vector, return @code{nextpow2 (length (@var{x}))}.
 ## @seealso{pow2, log2}
 ## @end deftypefn
 
@@ -40,19 +42,12 @@
     print_usage ();
   endif
 
-  if (! (isscalar (x) || isvector (x)))
-    error ("nextpow2: X must be a scalar or a vector");
-  endif
-
-  t = length (x);
-  if (t > 1)
-    x = t;
+  if (! isnumeric (x))
+    error ("nextpow2: X must be numeric");
   endif
 
   [f, n] = log2 (abs (x));
-  if (f == 0.5)
-    n = n - 1;
-  endif
+  n(f == 0.5)--;
 
 endfunction
 
@@ -63,7 +58,7 @@
 %!assert (nextpow2 (-16), 4)
 %!assert (nextpow2 (-17), 5)
 %!assert (nextpow2 (-31), 5)
-%!assert (nextpow2 (1:17), 5)
+%!assert (nextpow2 (1:17), [0 1 2 2 3 3 3 3 4 4 4 4 4 4 4 4 5])
 
 %!error nexpow2 ()
 %!error nexpow2 (1, 2)