Find inclusive intervals

hdinterval.py

@@ -50,26 +50,27 @@ class HDInterval:
 
         return HDI(*args)
 
-    def _at(self, target, tolerance, ci, jump):
+    def _at(self, target, tolerance, ci=1, jump=1):
         if ci > 1:
             return 1
 
-        interval = self(ci)
-        if any(math.isclose(x, target, abs_tol=tolerance) for x in interval):
+        hdi = self(ci)
+        if any(x in tolerance for x in hdi):
             return ci
 
-        adjust = op.sub if target in interval else op.add
+        adjust = op.sub if target in hdi else op.add
         ci = adjust(ci, jump)
         jump /= 2
 
         return self._at(target, tolerance, ci, jump)
 
-    def at(self, target, tolerance=1e-3):
+    def at(self, target, tolerance=1e-4):
         assert tolerance > 0
 
         while tolerance < 1:
+            hdi = HDI(target, target + tolerance)
             try:
-                return self._at(target, tolerance, 1, 1)
+                return self._at(target, hdi)
             except RecursionError:
                 tolerance *= 10
                 warnings.warn(f'Tolerance reduced: {tolerance}')