fixed fmm checks

chunkie/@kernel/elast2d.m

@@ -90,4 +90,9 @@
 
 end
 
+icheck = exist(['fmm2d.' mexext], 'file');
+if icheck ~=3
+    obj.fmm = [];
+end
+
 end

chunkie/@kernel/helm2d.m

@@ -86,4 +86,10 @@
 
 end
 
+icheck = exist(['fmm2d.' mexext], 'file');
+if icheck ~=3
+    obj.fmm = [];
+end
+
+
 end

chunkie/@kernel/helm2ddiff.m

@@ -92,4 +92,10 @@
 
 end
 
+icheck = exist(['fmm2d.' mexext], 'file');
+if icheck ~=3
+    obj.fmm = [];
+end
+
+
 end

chunkie/@kernel/lap2d.m

@@ -85,4 +85,9 @@
 
 end
 
+icheck = exist(['fmm2d.' mexext], 'file');
+if icheck ~=3
+    obj.fmm = [];
+end
+
 end

chunkie/@kernel/stok2d.m

@@ -84,4 +84,10 @@
 
 end
 
+icheck = exist(['fmm2d.' mexext], 'file');
+if icheck ~=3
+    obj.fmm = [];
+end
+
+
 end

chunkie/chunkerkerneval.m

@@ -272,7 +272,16 @@
      end
 end
 
-
+if strcmpi(imethod,'fmm')
+    icheck = exist(['fmm2d.' mexext], 'file');
+    if icheck ~=3
+        imethod = 'direct';
+        fstr = ['CHUNKERKERNEVAL: forcefmm flag used but fmm2d not found\n' ...
+           'Using direct computation instead\nMake sure fmm2d.' mexext ...
+           ' is in MATLAB path'];
+        warning(sprintf(fstr))
+    end
+end
 
 
 if strcmpi(imethod,'direct')