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-rw-r--r--src/approx/maceps.lisp1
1 files changed, 1 insertions, 0 deletions
diff --git a/src/approx/maceps.lisp b/src/approx/maceps.lisp
index ad234e8..debaa67 100644
--- a/src/approx/maceps.lisp
+++ b/src/approx/maceps.lisp
@@ -8,4 +8,5 @@
(setf h (/ h 2)
err (abs (- (funcall f (+ a h))
(funcall f a))))
+ when (> err 0)
collect (list a h err))))