Closed
Description
Describe the issue:
numpy.matmul returns incorrect result when order="F" with numpy-2.3.0. With numpy-2.2.6, it was working fine.
Reproduce the code example:
import numpy
print("numpy version: ", numpy.__version__)
a = numpy.arange(24, dtype="f8").reshape((4,2,3))
b = numpy.arange(60, dtype="f8").reshape((4,3,5))
res = numpy.matmul(a, b, order="F")
print(res[0, ...])
# numpy version: 2.3.0
# ** On entry to DGEMM parameter number 13 had an illegal value
# ** On entry to DGEMM parameter number 13 had an illegal value
# ** On entry to DGEMM parameter number 13 had an illegal value
# ** On entry to DGEMM parameter number 13 had an illegal value
# [[5.43472924e-310 5.43508168e-310 6.85110253e-310 6.85110253e-310
# 6.85110253e-310]
# [0.00000000e+000 5.43508169e-310 5.43508169e-310 6.85110251e-310
# 6.85110253e-310]]Error message:
Python and NumPy Versions:
2.3.0
3.12.11 | packaged by conda-forge | (main, Jun 4 2025, 14:45:31) [GCC 13.3.0]
Runtime Environment:
No response
Context for the issue:
No response