Initial commit

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>

common/maths/errors.go

@@ -0,0 +1,31 @@
+package maths
+
+type statsError struct {
+	err string
+}
+
+func (s statsError) Error() string {
+	return s.err
+}
+
+func (s statsError) String() string {
+	return s.err
+}
+
+var (
+	ErrEmptyInput = statsError{"Input must not be empty."}
+
+	ErrNaN = statsError{"Not a number."}
+
+	ErrNegative = statsError{"Must not contain negative values."}
+
+	ErrZero = statsError{"Must not contain zero values."}
+
+	ErrBounds = statsError{"Input is outside of range."}
+
+	ErrSize = statsError{"Must be the same length."}
+
+	ErrInfValue = statsError{"Value is infinite."}
+
+	ErrYCoord = statsError{"Y Value must be greater than zero."}
+)