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-rw-r--r--src/utils.sc5
1 files changed, 5 insertions, 0 deletions
diff --git a/src/utils.sc b/src/utils.sc
index 20452b0..94b7dcd 100644
--- a/src/utils.sc
+++ b/src/utils.sc
@@ -89,6 +89,11 @@ the range [0,pi]."
exact value EXACT."
(return (fabs (- 1 (/ approx exact)))))
+(define (rtol? approx exact rtol) (int double double double)
+ "Return 1 if the approximate value APPROX is within RTOL relative
+tolerance of the exact value EXACT. Else, return 0."
+ (return (< (rerror approx exact) rtol)))
+
(sc-define-syntax (with-root-fsolver solver solver-type function a b body ...)
(with-alloc solver gsl-root-fsolver*
(gsl-root-fsolver-alloc solver-type)