Opened 7 weeks ago

Closed 7 weeks ago

#18798 closed defect (not a bug)

AddH: Singular matrix

Reported by: jitued@… Owned by: Eric Pettersen
Priority: normal Milestone:
Component: Structure Analysis Version:
Keywords: Cc:
Blocked By: Blocking:
Notify when closed: Platform: all
Project: ChimeraX

Description 

The following bug report has been submitted:
Platform:        macOS-26.0-arm64-arm-64bit
ChimeraX Version: 1.10 (2025-06-26 08:57:52 UTC)
Description
Replace this text with list of actions that caused this problem to occur

Log:
UCSF ChimeraX version: 1.10 (2025-06-26)  
© 2016-2025 Regents of the University of California. All rights reserved.  
How to cite UCSF ChimeraX  

> open
> /Users/jitendramaharana/Desktop/04_ToDo/02_Np1L-MDP/Np1NL/02_Vina/rNOD2-MD/1_rN2-MDP/rNOD2.pdb

Chain information for rNOD2.pdb #1  
---  
Chain | Description  
A | No description available  
  
Computing secondary structure  

> show atoms

> ui tool show "Add Charges"

> addh

Summary of feedback from adding hydrogens to rNOD2.pdb #1  
---  
notes | No usable SEQRES records for rNOD2.pdb (#1) chain A; guessing termini instead  
Chain-initial residues that are actual N termini: /A VAL 744  
Chain-initial residues that are not actual N termini:  
Chain-final residues that are actual C termini:  
Chain-final residues that are not actual C termini: /A LEU 1020  
  
Traceback (most recent call last):  
File
"/Applications/ChimeraX-1.10.app/Contents/Library/Frameworks/Python.framework/Versions/3.11/lib/python3.11/site-
packages/chimerax/addh/tool.py", line 186, in add_h  
run(self.session, cmd)  
File
"/Applications/ChimeraX-1.10.app/Contents/Library/Frameworks/Python.framework/Versions/3.11/lib/python3.11/site-
packages/chimerax/core/commands/run.py", line 49, in run  
results = command.run(text, log=log, return_json=return_json)  
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^  
File
"/Applications/ChimeraX-1.10.app/Contents/Library/Frameworks/Python.framework/Versions/3.11/lib/python3.11/site-
packages/chimerax/core/commands/cli.py", line 3221, in run  
result = ci.function(session, **kw_args)  
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^  
File
"/Applications/ChimeraX-1.10.app/Contents/Library/Frameworks/Python.framework/Versions/3.11/lib/python3.11/site-
packages/chimerax/addh/cmd.py", line 77, in cmd_addh  
add_h_func(session, structures, template=template, in_isolation=in_isolation,
**prot_schemes)  
File
"/Applications/ChimeraX-1.10.app/Contents/Library/Frameworks/Python.framework/Versions/3.11/lib/python3.11/site-
packages/chimerax/addh/cmd.py", line 184, in hbond_add_hydrogens  
add_hydrogens(session, atoms, type_info_for_atom, naming_schemas,
hydrogen_totals,  
File
"/Applications/ChimeraX-1.10.app/Contents/Library/Frameworks/Python.framework/Versions/3.11/lib/python3.11/site-
packages/chimerax/addh/hbond.py", line 220, in add_hydrogens  
h_positions = bond_positions(atom._addh_coord, geom, bond_length,  
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^  
File
"/Applications/ChimeraX-1.10.app/Contents/Library/Frameworks/Python.framework/Versions/3.11/lib/python3.11/site-
packages/chimerax/atomic/bond_geom.py", line 84, in bond_positions  
return planar_pos(bondee, bonded, bond_len, coplanar, toward, away, toward2,
away2)  
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^  
File
"/Applications/ChimeraX-1.10.app/Contents/Library/Frameworks/Python.framework/Versions/3.11/lib/python3.11/site-
packages/chimerax/atomic/bond_geom.py", line 140, in planar_pos  
pos = angle_pos(bondee, cur_bonded[0], bond_len, 120.0, coplanar)  
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^  
File
"/Applications/ChimeraX-1.10.app/Contents/Library/Frameworks/Python.framework/Versions/3.11/lib/python3.11/site-
packages/chimerax/atomic/bond_geom.py", line 258, in angle_pos  
points.append(xform.inverse() * angle)  
^^^^^^^^^^^^^^^  
File
"/Applications/ChimeraX-1.10.app/Contents/Library/Frameworks/Python.framework/Versions/3.11/lib/python3.11/site-
packages/chimerax/geometry/place.py", line 201, in inverse  
self._inverse = Place(m34.invert_matrix(self._matrix))  
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^  
File
"/Applications/ChimeraX-1.10.app/Contents/Library/Frameworks/Python.framework/Versions/3.11/lib/python3.11/site-
packages/chimerax/geometry/matrix.py", line 141, in invert_matrix  
rinv[:, :] = matrix_inverse(r)  
^^^^^^^^^^^^^^^^^  
File
"/Applications/ChimeraX-1.10.app/Contents/Library/Frameworks/Python.framework/Versions/3.11/lib/python3.11/site-
packages/numpy/linalg/linalg.py", line 561, in inv  
ainv = _umath_linalg.inv(a, signature=signature, extobj=extobj)  
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^  
File
"/Applications/ChimeraX-1.10.app/Contents/Library/Frameworks/Python.framework/Versions/3.11/lib/python3.11/site-
packages/numpy/linalg/linalg.py", line 112, in _raise_linalgerror_singular  
raise LinAlgError("Singular matrix")  
numpy.linalg.LinAlgError: Singular matrix  
  
numpy.linalg.LinAlgError: Singular matrix  
  
File
"/Applications/ChimeraX-1.10.app/Contents/Library/Frameworks/Python.framework/Versions/3.11/lib/python3.11/site-
packages/numpy/linalg/linalg.py", line 112, in _raise_linalgerror_singular  
raise LinAlgError("Singular matrix")  
  
See log for complete Python traceback.  
  

> ui tool show "Add Hydrogens"

> addh

Summary of feedback from adding hydrogens to rNOD2.pdb #1  
---  
notes | No usable SEQRES records for rNOD2.pdb (#1) chain A; guessing termini instead  
Chain-initial residues that are actual N termini: /A VAL 744  
Chain-initial residues that are not actual N termini:  
Chain-final residues that are actual C termini: /A LEU 1020  
Chain-final residues that are not actual C termini:  
  
Traceback (most recent call last):  
File
"/Applications/ChimeraX-1.10.app/Contents/Library/Frameworks/Python.framework/Versions/3.11/lib/python3.11/site-
packages/chimerax/addh/tool.py", line 186, in add_h  
run(self.session, cmd)  
File
"/Applications/ChimeraX-1.10.app/Contents/Library/Frameworks/Python.framework/Versions/3.11/lib/python3.11/site-
packages/chimerax/core/commands/run.py", line 49, in run  
results = command.run(text, log=log, return_json=return_json)  
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^  
File
"/Applications/ChimeraX-1.10.app/Contents/Library/Frameworks/Python.framework/Versions/3.11/lib/python3.11/site-
packages/chimerax/core/commands/cli.py", line 3221, in run  
result = ci.function(session, **kw_args)  
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^  
File
"/Applications/ChimeraX-1.10.app/Contents/Library/Frameworks/Python.framework/Versions/3.11/lib/python3.11/site-
packages/chimerax/addh/cmd.py", line 77, in cmd_addh  
add_h_func(session, structures, template=template, in_isolation=in_isolation,
**prot_schemes)  
File
"/Applications/ChimeraX-1.10.app/Contents/Library/Frameworks/Python.framework/Versions/3.11/lib/python3.11/site-
packages/chimerax/addh/cmd.py", line 184, in hbond_add_hydrogens  
add_hydrogens(session, atoms, type_info_for_atom, naming_schemas,
hydrogen_totals,  
File
"/Applications/ChimeraX-1.10.app/Contents/Library/Frameworks/Python.framework/Versions/3.11/lib/python3.11/site-
packages/chimerax/addh/hbond.py", line 220, in add_hydrogens  
h_positions = bond_positions(atom._addh_coord, geom, bond_length,  
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^  
File
"/Applications/ChimeraX-1.10.app/Contents/Library/Frameworks/Python.framework/Versions/3.11/lib/python3.11/site-
packages/chimerax/atomic/bond_geom.py", line 84, in bond_positions  
return planar_pos(bondee, bonded, bond_len, coplanar, toward, away, toward2,
away2)  
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^  
File
"/Applications/ChimeraX-1.10.app/Contents/Library/Frameworks/Python.framework/Versions/3.11/lib/python3.11/site-
packages/chimerax/atomic/bond_geom.py", line 140, in planar_pos  
pos = angle_pos(bondee, cur_bonded[0], bond_len, 120.0, coplanar)  
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^  
File
"/Applications/ChimeraX-1.10.app/Contents/Library/Frameworks/Python.framework/Versions/3.11/lib/python3.11/site-
packages/chimerax/atomic/bond_geom.py", line 258, in angle_pos  
points.append(xform.inverse() * angle)  
^^^^^^^^^^^^^^^  
File
"/Applications/ChimeraX-1.10.app/Contents/Library/Frameworks/Python.framework/Versions/3.11/lib/python3.11/site-
packages/chimerax/geometry/place.py", line 201, in inverse  
self._inverse = Place(m34.invert_matrix(self._matrix))  
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^  
File
"/Applications/ChimeraX-1.10.app/Contents/Library/Frameworks/Python.framework/Versions/3.11/lib/python3.11/site-
packages/chimerax/geometry/matrix.py", line 141, in invert_matrix  
rinv[:, :] = matrix_inverse(r)  
^^^^^^^^^^^^^^^^^  
File
"/Applications/ChimeraX-1.10.app/Contents/Library/Frameworks/Python.framework/Versions/3.11/lib/python3.11/site-
packages/numpy/linalg/linalg.py", line 561, in inv  
ainv = _umath_linalg.inv(a, signature=signature, extobj=extobj)  
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^  
File
"/Applications/ChimeraX-1.10.app/Contents/Library/Frameworks/Python.framework/Versions/3.11/lib/python3.11/site-
packages/numpy/linalg/linalg.py", line 112, in _raise_linalgerror_singular  
raise LinAlgError("Singular matrix")  
numpy.linalg.LinAlgError: Singular matrix  
  
numpy.linalg.LinAlgError: Singular matrix  
  
File
"/Applications/ChimeraX-1.10.app/Contents/Library/Frameworks/Python.framework/Versions/3.11/lib/python3.11/site-
packages/numpy/linalg/linalg.py", line 112, in _raise_linalgerror_singular  
raise LinAlgError("Singular matrix")  
  
See log for complete Python traceback.  
  




OpenGL version: 4.1 Metal - 90.5
OpenGL renderer: Apple M1 Pro
OpenGL vendor: Apple

Python: 3.11.4
Locale: en_US.UTF-8
Qt version: PyQt6 6.8.1, Qt 6.8.2
Qt runtime version: 6.8.2
Qt platform: cocoa
Hardware:

    Hardware Overview:

      Model Name: MacBook Pro
      Model Identifier: MacBookPro18,3
      Model Number: MKGT3CT/A
      Chip: Apple M1 Pro
      Total Number of Cores: 10 (8 performance and 2 efficiency)
      Memory: 16 GB
      System Firmware Version: 13822.1.2
      OS Loader Version: 13822.1.2

Software:

    System Software Overview:

      System Version: macOS 26.0 (25A354)
      Kernel Version: Darwin 25.0.0
      Time since boot: 1 day, 12 hours, 2 minutes

Graphics/Displays:

    Apple M1 Pro:

      Chipset Model: Apple M1 Pro
      Type: GPU
      Bus: Built-In
      Total Number of Cores: 16
      Vendor: Apple (0x106b)
      Metal Support: Metal 4
      Displays:
        Color LCD:
          Display Type: Built-in Liquid Retina XDR Display
          Resolution: 3024 x 1964 Retina
          Main Display: Yes
          Mirror: Off
          Online: Yes
          Automatically Adjust Brightness: Yes
          Connection Type: Internal


Installed Packages:
    alabaster: 1.0.0
    appdirs: 1.4.4
    appnope: 0.1.4
    asttokens: 3.0.0
    auditwheel: 6.4.0
    babel: 2.17.0
    beautifulsoup4: 4.13.3
    biopython: 1.83
    blockdiag: 3.0.0
    blosc2: 3.5.0
    build: 1.2.2.post1
    certifi: 2023.11.17
    cftime: 1.6.4.post1
    charset-normalizer: 3.4.2
    ChimeraX-AddCharge: 1.5.19
    ChimeraX-AddH: 2.2.7
    ChimeraX-AlignmentAlgorithms: 2.0.2
    ChimeraX-AlignmentHdrs: 3.6.1
    ChimeraX-AlignmentMatrices: 2.1
    ChimeraX-Alignments: 2.20.2
    ChimeraX-AllMetal3D: 0.8
    ChimeraX-AlphaFold: 1.0.1
    ChimeraX-AltlocExplorer: 1.1.2
    ChimeraX-AmberInfo: 1.0
    ChimeraX-Aniso: 1.1.4
    ChimeraX-Arrays: 1.1
    ChimeraX-Atomic: 1.60.7
    ChimeraX-AtomicLibrary: 14.1.18
    ChimeraX-AtomSearch: 2.0.1
    ChimeraX-AxesPlanes: 2.4
    ChimeraX-BasicActions: 1.1.3
    ChimeraX-BILD: 1.0
    ChimeraX-BlastProtein: 3.0.0
    ChimeraX-Boltz: 1.0
    ChimeraX-BondRot: 2.0.4
    ChimeraX-BugReporter: 1.0.2
    ChimeraX-BuildStructure: 2.13.1
    ChimeraX-Bumps: 1.0
    ChimeraX-BundleBuilder: 1.5.1
    ChimeraX-ButtonPanel: 1.0.1
    ChimeraX-CageBuilder: 1.0.1
    ChimeraX-CellPack: 1.0
    ChimeraX-Centroids: 1.4
    ChimeraX-ChangeChains: 1.1
    ChimeraX-CheckWaters: 1.5
    ChimeraX-ChemGroup: 2.0.2
    ChimeraX-Clashes: 2.3
    ChimeraX-ColorActions: 1.0.5
    ChimeraX-ColorGlobe: 1.0
    ChimeraX-ColorKey: 1.5.8
    ChimeraX-CommandLine: 1.3
    ChimeraX-ConnectStructure: 2.0.1
    ChimeraX-Contacts: 1.0.1
    ChimeraX-copick: 1.4.1
    ChimeraX-Core: 1.10
    ChimeraX-CoreFormats: 1.2
    ChimeraX-coulombic: 1.4.5
    ChimeraX-Crosslinks: 1.0
    ChimeraX-Crystal: 1.0
    ChimeraX-CrystalContacts: 1.0.1
    ChimeraX-DataFormats: 1.2.4
    ChimeraX-Dicom: 1.2.7
    ChimeraX-DistMonitor: 1.4.2
    ChimeraX-DockPrep: 1.1.4
    ChimeraX-Dssp: 2.0
    ChimeraX-EMalign: 0.1.3
    ChimeraX-EMDB-SFF: 1.0
    ChimeraX-ESMFold: 1.0
    ChimeraX-FileHistory: 1.0.1
    ChimeraX-FunctionKey: 1.0.1
    ChimeraX-Geometry: 1.3
    ChimeraX-gltf: 1.0
    ChimeraX-Graphics: 1.4.1
    ChimeraX-Hbonds: 2.5.1
    ChimeraX-Help: 1.3
    ChimeraX-HKCage: 1.3
    ChimeraX-IHM: 1.1
    ChimeraX-ImageFormats: 1.2
    ChimeraX-IMOD: 1.0
    ChimeraX-IO: 1.0.3
    ChimeraX-ItemsInspection: 1.0.1
    ChimeraX-IUPAC: 1.0
    ChimeraX-KVFinder: 1.6.2
    ChimeraX-Label: 1.1.14
    ChimeraX-ListInfo: 1.2.2
    ChimeraX-Log: 1.2
    ChimeraX-LookingGlass: 1.1
    ChimeraX-Maestro: 1.9.1
    ChimeraX-Map: 1.3
    ChimeraX-MapData: 2.0
    ChimeraX-MapEraser: 1.0.1
    ChimeraX-MapFilter: 2.0.1
    ChimeraX-MapFit: 2.0
    ChimeraX-MapSeries: 2.1.1
    ChimeraX-Markers: 1.0.1
    ChimeraX-Mask: 1.0.2
    ChimeraX-MatchMaker: 2.2.2
    ChimeraX-MCopy: 1.0
    ChimeraX-MDcrds: 2.10.1
    ChimeraX-MedicalToolbar: 1.1
    ChimeraX-Meeting: 1.0.1
    ChimeraX-MLP: 1.1.1
    ChimeraX-mmCIF: 2.16
    ChimeraX-MMTF: 2.2
    ChimeraX-ModelArchive: 1.0
    ChimeraX-Modeller: 1.5.19
    ChimeraX-ModelPanel: 1.5.1
    ChimeraX-ModelSeries: 1.0.1
    ChimeraX-Mol2: 2.0.3
    ChimeraX-Mole: 1.0
    ChimeraX-Morph: 1.0.2
    ChimeraX-MouseModes: 1.2
    ChimeraX-Movie: 1.0
    ChimeraX-MutationScores: 1.0
    ChimeraX-Neuron: 1.0
    ChimeraX-Nifti: 1.2
    ChimeraX-NIHPresets: 1.2.8
    ChimeraX-NMRSTAR: 1.0.2
    ChimeraX-NRRD: 1.2
    ChimeraX-Nucleotides: 2.0.3
    ChimeraX-OpenCommand: 1.14.1
    ChimeraX-OrthoPick: 1.0.1
    ChimeraX-PDB: 2.7.10
    ChimeraX-PDBBio: 1.0.1
    ChimeraX-PDBImages: 1.2
    ChimeraX-PDBLibrary: 1.0.4
    ChimeraX-PDBMatrices: 1.0
    ChimeraX-PhenixUI: 1.3.9
    ChimeraX-PickBlobs: 1.0.1
    ChimeraX-PICKLUSTER: 2.1
    ChimeraX-Positions: 1.0
    ChimeraX-PresetMgr: 1.1.3
    ChimeraX-ProfileGrids: 1.1.2
    ChimeraX-PubChem: 2.2
    ChimeraX-QScore: 1.2
    ChimeraX-ReadPbonds: 1.0.1
    ChimeraX-Registration: 1.1.2
    ChimeraX-RemoteControl: 1.0
    ChimeraX-RenderByAttr: 1.6.3
    ChimeraX-RenumberResidues: 1.1
    ChimeraX-ResidueFit: 1.0.1
    ChimeraX-RestServer: 1.3.1
    ChimeraX-RIBFIND: 0.4
    ChimeraX-RNALayout: 1.0
    ChimeraX-RotamerLibMgr: 4.0
    ChimeraX-RotamerLibsDunbrack: 2.0
    ChimeraX-RotamerLibsDynameomics: 2.0
    ChimeraX-RotamerLibsRichardson: 2.0
    ChimeraX-SaveCommand: 1.5.1
    ChimeraX-SchemeMgr: 1.0
    ChimeraX-SDF: 2.0.3
    ChimeraX-Segger: 1.0
    ChimeraX-Segment: 1.0.1
    ChimeraX-Segmentations: 3.5.7
    ChimeraX-SelInspector: 1.0
    ChimeraX-SeqView: 2.17.1
    ChimeraX-Shape: 1.1
    ChimeraX-Shell: 1.0.1
    ChimeraX-Shortcuts: 1.2.1
    ChimeraX-ShowSequences: 1.0.3
    ChimeraX-SideView: 1.0.1
    ChimeraX-SimilarStructures: 1.0.1
    ChimeraX-Smiles: 2.1.2
    ChimeraX-SmoothLines: 1.0
    ChimeraX-SpaceNavigator: 1.0
    ChimeraX-StarMap: 1.2.15
    ChimeraX-StdCommands: 1.19.1
    ChimeraX-STL: 1.0.1
    ChimeraX-Storm: 1.0
    ChimeraX-StructMeasure: 1.2.1
    ChimeraX-Struts: 1.0.1
    ChimeraX-Surface: 1.0.1
    ChimeraX-SwapAA: 2.0.1
    ChimeraX-SwapRes: 2.5.2
    ChimeraX-TapeMeasure: 1.0
    ChimeraX-TaskManager: 1.0
    ChimeraX-Test: 1.0
    ChimeraX-Toolbar: 1.2.3
    ChimeraX-ToolshedUtils: 1.2.4
    ChimeraX-Topography: 1.0
    ChimeraX-ToQuest: 1.0
    ChimeraX-Tug: 1.0.1
    ChimeraX-UI: 1.45.2
    ChimeraX-Umap: 1.0
    ChimeraX-uniprot: 2.3.1
    ChimeraX-UnitCell: 1.0.1
    ChimeraX-ViewDockX: 1.4.4
    ChimeraX-VIPERdb: 1.0
    ChimeraX-Vive: 1.1
    ChimeraX-VolumeMenu: 1.0.1
    ChimeraX-vrml: 1.0
    ChimeraX-VTK: 1.0
    ChimeraX-WavefrontOBJ: 1.0
    ChimeraX-WebCam: 1.0.2
    ChimeraX-WebServices: 1.1.5
    ChimeraX-Zone: 1.0.1
    colorama: 0.4.6
    comm: 0.2.2
    contourpy: 1.3.2
    coverage: 7.9.1
    cxservices: 1.2.3
    cycler: 0.12.1
    Cython: 3.0.12
    debugpy: 1.8.14
    decorator: 5.2.1
    DiffFit: 0.7.0
    docutils: 0.21.2
    executing: 2.2.0
    filelock: 3.18.0
    finufft: 2.4.1
    fonttools: 4.58.4
    fsspec: 2025.5.1
    funcparserlib: 2.0.0a0
    glfw: 2.9.0
    grako: 3.16.5
    h5py: 3.14.0
    html2text: 2024.2.26
    idna: 3.10
    ihm: 2.2
    imagecodecs: 2024.6.1
    imagesize: 1.4.1
    iniconfig: 2.1.0
    ipykernel: 6.29.5
    ipython: 8.26.0
    ipywidgets: 8.1.7
    jedi: 0.19.1
    Jinja2: 3.1.6
    jupyter_client: 8.6.3
    jupyter_core: 5.8.1
    jupyterlab_widgets: 3.0.15
    kiwisolver: 1.4.8
    line_profiler: 4.2.0
    lxml: 5.3.1
    lz4: 4.4.4
    MarkupSafe: 3.0.2
    matplotlib: 3.10.1
    matplotlib-inline: 0.1.7
    MolecularDynamicsViewer: 1.6
    mpmath: 1.3.0
    mrcfile: 1.5.0
    msgpack: 1.1.0
    ndindex: 1.10.0
    nest-asyncio: 1.6.0
    netCDF4: 1.6.5
    networkx: 3.3
    nibabel: 5.2.0
    nptyping: 2.5.0
    numexpr: 2.11.0
    numpy: 1.26.4
    OpenMM: 8.2.0
    openvr: 1.26.701
    packaging: 24.2
    ParmEd: 4.2.2
    parso: 0.8.4
    pep517: 0.13.1
    pexpect: 4.9.0
    pickleshare: 0.7.5
    pillow: 10.4.0
    pip: 25.0.1
    pkginfo: 1.11.1
    platformdirs: 4.3.8
    pluggy: 1.6.0
    prompt_toolkit: 3.0.51
    psutil: 7.0.0
    ptyprocess: 0.7.0
    pure_eval: 0.2.3
    py-cpuinfo: 9.0.0
    pycollada: 0.8
    pydicom: 2.4.4
    pyelftools: 0.32
    Pygments: 2.18.0
    pynmrstar: 3.3.5
    pynrrd: 1.0.0
    PyOpenGL: 3.1.9
    PyOpenGL-accelerate: 3.1.9
    pyopenxr: 1.1.4501
    pyparsing: 3.2.3
    pyproject_hooks: 1.2.0
    PyQt6-commercial: 6.8.1
    PyQt6-Qt6: 6.8.2
    PyQt6-WebEngine-commercial: 6.8.0
    PyQt6-WebEngine-Qt6: 6.8.2
    PyQt6_sip: 13.10.0
    pyqtgraph: 0.13.7
    pytest: 8.4.1
    pytest-cov: 6.2.1
    python-dateutil: 2.9.0.post0
    pytz: 2025.2
    pyzmq: 27.0.0
    qtconsole: 5.5.2
    QtPy: 2.4.3
    qtshim: 1.1
    RandomWords: 0.4.0
    requests: 2.32.3
    roman-numerals-py: 3.1.0
    scipy: 1.14.0
    setuptools: 78.1.0
    sfftk-rw: 0.8.1
    six: 1.16.0
    snowballstemmer: 3.0.1
    sortedcontainers: 2.4.0
    soupsieve: 2.7
    Sphinx: 8.2.3
    sphinx-autodoc-typehints: 3.1.0
    sphinxcontrib-applehelp: 2.0.0
    sphinxcontrib-blockdiag: 3.0.0
    sphinxcontrib-devhelp: 2.0.0
    sphinxcontrib-htmlhelp: 2.1.0
    sphinxcontrib-jsmath: 1.0.1
    sphinxcontrib-qthelp: 2.0.0
    sphinxcontrib-serializinghtml: 2.0.0
    stack-data: 0.6.3
    superqt: 0.7.1
    sympy: 1.14.0
    tables: 3.10.2
    tcia_utils: 1.5.1
    tifffile: 2025.3.13
    tinyarray: 1.2.4
    torch: 2.2.1
    tornado: 6.5.1
    traitlets: 5.14.3
    typing_extensions: 4.14.0
    tzdata: 2025.2
    urllib3: 2.5.0
    wcwidth: 0.2.13
    webcolors: 24.11.1
    wheel: 0.45.1
    wheel-filename: 1.4.2
    widgetsnbextension: 4.0.14

Change History (2)

comment:1 by Eric Pettersen, 7 weeks ago

Component: Unassigned → Structure Analysis
Owner: set to Eric Pettersen
Platform: → all
Project: → ChimeraX
Status: new → accepted
Summary: ChimeraX bug report submission → AddH: Singular matrix

comment:2 by Eric Pettersen, 7 weeks ago

Resolution: → not a bug
Status: accepted → closed

Hi Jitendra,

Thanks for reporting this problem. It typically indicates some kind of problem with your structure file -- most frequently when two atoms are directly on top of one another. Occasionally when three atoms that should not be collinear are exactly collinear.

--Eric

Eric Pettersen
UCSF Computer Graphics Lab

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