diff -r 8514c3d67201 -r 5046ff7d13b8 +noname/testCfl.m
--- a/+noname/testCfl.m	Mon Dec 14 19:15:01 2015 +0100
+++ b/+noname/testCfl.m	Tue Dec 15 16:38:02 2015 +0100
@@ -6,9 +6,10 @@
     default_arg('threshold',1e2);
     default_arg('silentFlag', false);
 
-    if T < alpha0(2)
-        error('Upper bound on alpha must be smaller than T');
-    end
+    % TODO:
+    % Set threshold from the initial conditions of the pde?
+    % Take a set number of steps instead of evolving to a certain time?
+    % Stop evolving when it has blown up?
 
     testAlpha = getAlphaTester(discr, T, threshold, silentFlag, timestepper_method);
 
@@ -29,13 +30,26 @@
     % Use bisection to find sharp estimate
     while( (alpha0(2)-alpha0(1))/alpha0(1) > tol)
         alpha = mean(alpha0);
-        fprintf('[%.3e,%.3e]: ', alpha0(1), alpha0(2));
-        ok = testAlpha(alpha);
+
+        if ~silentFlag
+            fprintf('[%.3e,%.3e]: ', alpha0(1), alpha0(2));
+        end
+
+        [ok, n_step, maxVal] = testAlpha(alpha);
+
         if ok
             alpha0(1) = alpha;
         else
             alpha0(2) = alpha;
         end
+
+        if ~silentFlag
+            fprintf('a = %.3e, n_step=%d  max = %.2e\n', alpha, n_step, maxVal);
+        end
+    end
+
+    if silentFlag
+        fprintf('Last calculated: a = %.3e, n_step=%d  max = %.2e\n', alpha, n_step, maxVal);
     end
 
     fprintf('T = %-3d dof = %-4d order = %d: clf = %.4e\n',T, discr.size(), discr.order, alpha0(1));
@@ -45,7 +59,7 @@
 function f = getAlphaTester(discr, T, threshold, silentFlag, timestepper_method)
 
     % Returns true if cfl was ok
-    function ok = testAlpha(alpha)
+    function [ok, n_step, maxVal] = testAlpha(alpha)
         ts = discr.getTimestepper(struct('method', timestepper_method, 'cfl', alpha));
 
         warning('off','all')
@@ -55,16 +69,14 @@
         [v,t] = ts.getV();
         maxVal = max(v);
 
-        if isnan(maxVal) || maxVal == Inf || maxVal > threshold
+        if isnan(maxVal) || maxVal == Inf || abs(maxVal) > threshold
             ok = false;
         else
             ok = true;
         end
 
-        if ~silentFlag
-            fprintf('a = %.3e, max= %.2e\n', alpha, maxVal);
-        end
+        n_step = ts.n;
     end
 
     f = @testAlpha;
-end
\ No newline at end of file
+end