From: Jason Stover <jhs@math.gcsu.edu>
Date: Sun, 6 Apr 2008 21:59:13 +0000 (+0000)
Subject: store intercept in proper place when using QR method
X-Git-Tag: v0.6.0~42
X-Git-Url: https://pintos-os.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=5b5f08a99c564c2f3e981ae0efe21ffc3c578ac4;p=pspp-builds.git

store intercept in proper place when using QR method
---

diff --git a/src/math/linreg/ChangeLog b/src/math/linreg/ChangeLog
index c92db77a..a93f3b3f 100644
--- a/src/math/linreg/ChangeLog
+++ b/src/math/linreg/ChangeLog
@@ -1,3 +1,9 @@
+2008-04-06  Jason Stover  <jhs@math.gcsu.edu>
+
+	* linreg.c (pspp_linreg): For the QR method of getting the least
+	squares estimates, store intercept in cache->intercept
+	instead of coefficienc structure. Partial fix of bug 22788.
+
 2008-03-10  Jason Stover  <jhs@math.gcsu.edu>
 
 	* linreg.c (pspp_linreg): Remove use of coefficient 0 as intercept.
diff --git a/src/math/linreg/linreg.c b/src/math/linreg/linreg.c
index 217e201c..0782c36f 100644
--- a/src/math/linreg/linreg.c
+++ b/src/math/linreg/linreg.c
@@ -397,10 +397,11 @@ pspp_linreg (const gsl_vector * Y, const gsl_matrix * X,
       wk = gsl_multifit_linear_alloc (design->size1, design->size2);
       rc = gsl_multifit_linear (design, Y, param_estimates,
 				cache->cov, &(cache->sse), wk);
-      for (i = 0; i < cache->n_coeffs; i++)
+      for (i = 1; i < cache->n_coeffs; i++)
 	{
 	  cache->coeff[i]->estimate = gsl_vector_get (param_estimates, i);
 	}
+      cache->intercept = gsl_vector_get (param_estimates, 0);
       if (rc == GSL_SUCCESS)
 	{
 	  gsl_multifit_linear_free (wk);