Skip to content

make random affine matrix #1621

New issue

Have a question about this project? Sign up for a free GitHub account to open an issue and contact its maintainers and the community.

Sign up for GitHub

By clicking “Sign up for GitHub”, you agree to our terms of service and privacy statement. We’ll occasionally send you account related emails.

Already on GitHub? Sign in to your account

Merged
wyli merged 2 commits into from
Feb 23, 2021
Merged

make random affine matrix #1621

Changes from all commits
Commits
Show all changes
2 commits
Select commit Hold shift + click to select a range
17b7334
make random inverse affine matrix
rijobro Feb 23, 2021
69b590c
Merge branch 'master' into rand_affine_matrix
wyli Feb 23, 2021
File filter

Filter by extension

Filter by extension
Conversations
Failed to load comments.
Loading
Jump to
Jump to file
Failed to load files.
Loading
Diff view
Diff view
13 changes: 13 additions & 0 deletions tests/utils.py
View file
Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -155,6 +155,19 @@ def make_nifti_image(array, affine=None):
return image_name


def make_rand_affine(ndim: int = 3, random_state: Optional[np.random.RandomState] = None):
"""Create random affine transformation (with values == -1, 0 or 1)."""
rs = np.random if random_state is None else random_state

vals = rs.choice([-1, 1], size=ndim)
positions = rs.choice(range(ndim), size=ndim, replace=False)
af = np.zeros([ndim + 1, ndim + 1])
af[ndim, ndim] = 1
for i, (v, p) in enumerate(zip(vals, positions)):
af[i, p] = v
return af


class DistTestCase(unittest.TestCase):
"""
testcase without _outcome, so that it's picklable.
Expand Down