If we use the normal equation method to solve the linear least square (LS) problems Ax=b, where the null space of A is empty. It may the following properties, [1] The matrix AHA is invertible; [2] The matrix AHA is singular [3] The LS solution is (AHA)-¹ (AHb). We can definitely say that: (a) (b) [1], [2], [3] are all correct Only [1], [2] are correct Only [1], [3] are correct [1], [2], [3] are all incorrect (d)

Advanced Engineering Mathematics
10th Edition
ISBN:9780470458365
Author:Erwin Kreyszig
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Chapter2: Second-order Linear Odes
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If we use the normal equation method to solve the linear least square (LS) problems
Ax=b, where the null space of A is empty. It may the following properties,
[1] The matrix AHA is invertible; [2] The matrix AHA is singular
[3] The LS solution is (AHA)-1 (AHb). We can definitely say that:
(a)
(b)
[1], [2], [3] are all correct
Only [1], [2] are correct
Only [1], [3] are correct
[1], [2], [3] are all incorrect
(d)
Transcribed Image Text:If we use the normal equation method to solve the linear least square (LS) problems Ax=b, where the null space of A is empty. It may the following properties, [1] The matrix AHA is invertible; [2] The matrix AHA is singular [3] The LS solution is (AHA)-1 (AHb). We can definitely say that: (a) (b) [1], [2], [3] are all correct Only [1], [2] are correct Only [1], [3] are correct [1], [2], [3] are all incorrect (d)
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