diff --git a/matlab/tests/private/testcu.m b/matlab/tests/private/testcu.m
index 2d68232ea6..31788e04df 100644
--- a/matlab/tests/private/testcu.m
+++ b/matlab/tests/private/testcu.m
@@ -815,7 +815,8 @@
         case {'absolute', 'additive', 'add', 'a', '+'}
             f = f + noise.level*r;
         otherwise
-            f = f * (1 + noise.level*r);
+            %f = f * (1 + noise.level*r);
+            f = f + max(abs(f), 1)*noise.level*r;  % abs(f) is reasonable because the distribution of r is symmetric w.r.t. 0.
         end
     end
 end
@@ -829,7 +830,8 @@
         case {'absolute', 'additive', 'add', 'a', '+'}
             f = f + dnoise.level*r;
         otherwise
-            f = f * (1 + dnoise.level*r);
+            %f = f * (1 + dnoise.level*r);
+            f = f + max(abs(f), 1)*dnoise.level*r;
         end
     end
 end
@@ -1063,7 +1065,7 @@
         'OET6', ...
         'OET7', ...
         'QINGNE', ...
-        'QPCBLEND' , ...
+        'QPCBLEND', ...
         'SPANHYD', ...      % 15
         'SWOPF', ...        % 10
         'TAX13322', ...     % 5
diff --git a/matlab/tests/profile.m b/matlab/tests/profile.m
index 6d4edc1ecb..b940e54706 100644
--- a/matlab/tests/profile.m
+++ b/matlab/tests/profile.m
@@ -91,7 +91,7 @@
     if isfield(options, 'eval_options') && isstruct(options.eval_options) && ~isempty(fieldnames(options.eval_options))
         test_feature = [test_feature, '.', strjoin(fieldnames(options.eval_options), '_')];
         if isfield(options.eval_options, 'dnoise')
-            if isnumeric(options.eval_options.dnoise) && isscalar(options.eval_options)
+            if isnumeric(options.eval_options.dnoise) && isscalar(options.eval_options.dnoise)
                 dnoise_level = abs(options.eval_options.dnoise);
             elseif isstruct(options.eval_options.dnoise) && isfield(options.eval_options.dnoise, 'level')
                 dnoise_level = abs(options.eval_options.dnoise.level);
@@ -103,7 +103,7 @@
             end
         end
         if isfield(options.eval_options, 'noise')
-            if isnumeric(options.eval_options.noise) && isscalar(options.eval_options)
+            if isnumeric(options.eval_options.noise) && isscalar(options.eval_options.noise)
                 noise_level = abs(options.eval_options.noise);
             elseif isstruct(options.eval_options.noise) && isfield(options.eval_options.noise, 'level')
                 noise_level = abs(options.eval_options.noise.level);