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-rw-r--r--double-error.c2
1 files changed, 2 insertions, 0 deletions
diff --git a/double-error.c b/double-error.c
index 15fd4df..fa6db67 100644
--- a/double-error.c
+++ b/double-error.c
@@ -114,6 +114,8 @@ double_error power(double_error de, double_error p) {
double valuetype_to_double(double_error de){ return de.v; }
+double inv_exptype_to_double(double_error de){ return 1.0/de.v; }
+
int root_to_string(char* s, double_error de, double_error p){
double_error de1p = power(de,ratio(int_to_valuetype(1),p));
to_string(s,de1p);