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  • libeigenlibeigen
  • eigeneigen
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  • #839
Closed
Open
Issue created Dec 04, 2019 by Eigen Bugzilla@eigenbzReporter

Wrong 1x1 triangular matrix-vector product

Submitted by Chen-Pang He

Assigned to Nobody

Link to original bugzilla bug (#839)

Description

Created attachment 473
Demo reproducing the bug

Our internal::triangular_matrix_vector_product is specialized for triangular matrix-vector product. When 1x1 times 1xn, it ends prematurely by computing only one entry.

The below is the output from the program compiled with the attachment.

Matrix:
0.144509
0.0973679
-0.228021
0.190039
-0.105256
-0.131808
0.0489002
0.160188

Triangular:
0.144509
0
0
0
0
0
0
0

?TRMV:
0.144509
0
0
0
0
0
0
0

?TRMM:
0.144509
0.0973679
-0.228021
0.190039
-0.105256
-0.131808
0.0489002
0.160188

Attachment 473, "Demo reproducing the bug":
tri.cpp

Blocking

#840

Edited Dec 05, 2019 by Eigen Bugzilla
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