fm now creates grid from 0 to 1.

New test mi.f2t

pub/ftest/mi.f2t

+#!/usr/bin/env frida
+fm 101 1 h
+0 oy sin(10*x)
+0 oy .8*x
+2 mi 1
+exit_unless(abs(y[3,0,0]-(0))<1e-15,"mi_test11")
+exit_unless(abs(y[3,0,50]-(sin(4)))<1e-7,"mi_test12")
+exit_unless(abs(y[3,0,100]-(sin(8)))<1e-7,"mi_test13")
+exit(0)

pub/ftest/mpaf.f2t

 #!/usr/bin/env frida
-fm 10 1 h
+fm 11 1 h
 0 oy i^2
 1 mpaf 3
 exit_unless(abs(x[2,0,2]-.7)<1e-15,"mpaf_x")

pub/lib/import.cpp

@@ -244,8 +244,12 @@ void NImport::make_grid()
         PSpec s(new CSpec);
 
         s->x.resize(ni);
-        for (int i = 0; i < ni; ++i)
-            s->x[i] = ((double)i) / ni;
+        if (ni==1) {
+            s->x[0] = 0;
+        } else {
+            for (int i = 0; i < ni; ++i)
+                s->x[i] = ((double)i) / (ni-1);
+        }
         s->y.clear();
         s->y.resize(ni, 0.);