--- a/lstsq/questions.rst Tue Oct 12 10:36:46 2010 +0530
+++ b/lstsq/questions.rst Tue Oct 12 10:47:28 2010 +0530
@@ -8,6 +8,8 @@
#. [1.0, 1.0, 1.0]
#. Error
+ Answer: array([1, 1, 1])
+
2. What does ones_like([1.2, 3, 4, 5]) produce
a. [1.2, 3, 4, 5]
@@ -15,4 +17,16 @@
#. array([1, 1, 1, 1])
#. array([1.2, 3, 4, 5])
+ Answer: array([1.0, 1.0, 1.0, 1.0])
+ 3. The plot of ``u`` vs ``v`` is a bunch of scattered points that show a
+ linear trend. How do you find the least square fit line of ``u`` vs ``v``.
+
+ Answer::
+
+ A = array(u, ones_like(u)).T
+ result = lstsq(A, v)
+ m, c = result[0]
+
+ lst_line = m * u + c
+