From 0bd2ab4d1f9e8fdbf55ed11d61fe2e75720a334a Mon Sep 17 00:00:00 2001
From: justanothercatgirl <sotov@twistea.su>
Date: Thu, 17 Apr 2025 12:48:23 +0300
Subject: finished 206, 207

---
 libprakpp/include/prakmath.hpp | 22 +++++++++++++++++++++-
 1 file changed, 21 insertions(+), 1 deletion(-)

(limited to 'libprakpp/include/prakmath.hpp')

diff --git a/libprakpp/include/prakmath.hpp b/libprakpp/include/prakmath.hpp
index bb09e74..d43c11f 100644
--- a/libprakpp/include/prakmath.hpp
+++ b/libprakpp/include/prakmath.hpp
@@ -321,7 +321,6 @@ void least_squares_linear(
 			  << ", s.size() = " << ss.size() << std::endl;
 		return;
 	}
-	[[assume(xs.size() == ys.size() && ys.size() == ss.size())]];
 	size_t sz = xs.size();
 
 	prak::vector<T> ones(sz);
@@ -364,6 +363,27 @@ void least_squares_linear(
 	b.err = sqrt(d1 / D);
 }
 
+template <std::floating_point T>
+void least_squares_prop(
+	const prak::vector<T> &xs, 
+	const prak::vector<T> &ys, 
+	const prak::vector<T> &ss, 
+	struct pvalue<T> &a) {
+	assert("Different-sized vectors passed to least squares method" && xs.size() == ys.size());
+	size_t s = xs.size();
+	prak::vector<T> buf(s), si(s);
+	vmul(ss.data(), ss.data(), si.data(), s);
+	
+	vmul(xs.data(), ys.data(), buf.data(), s);
+	vdiv(buf.data(), ss.data(), buf.data(), s);
+	T D1 = vsum(buf.data(), s);
+	
+	vmul(xs.data(), xs.data(), buf.data(), s);
+	vdiv(buf.data(), ss.data(), buf.data(), s);
+	T D2 = vsum(buf.data(), s);
+	a.val = D1/D2;
+	a.err = 1/D2;
+}
 
 /// May throw std::bad_optional_access
 template <typename T>
-- 
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