Data summary (data_info)

meshioplusplus.data_info(mesh) reports a per-array summary of everything a mesh's data maps carry, without modifying it. It is the data view that complements the topological info verb and the geometric stats: info tells you about points and cells, stats about the shape they occupy, and data_info about the fields attached to them. It is a data operation, not a file format.

import meshioplusplus as mp

mesh = mp.read("part.vtu")
for a in mp.data_info(mesh):
    print(a["location"], a["name"], a["dtype"],
          a["num_entries"], a["num_components"],
          a["min"], a["max"], a["mean"], a["num_nan"])

Returned fields

data_info returns a list of dicts, ordered point_data, then cell_data, then field_data, each group sorted by name. Each dict carries:

Key	Meaning
location	"point_data", "cell_data" or "field_data"
name	the array name
dtype	the dtype as stored, e.g. "f8", "i4"
shape	the shape as stored (for cell_data, block 0's)
num_blocks	cell_data: the number of cell blocks; 1 otherwise
num_entries	rows — points, cells summed over all blocks, or the field length
num_components	product of the trailing dimensions (1 for a scalar)
num_values	num_entries × num_components
min / max / mean	over the finite values; NaN when there are none
min_per_component / max_per_component / mean_per_component	the same, per component
num_nan / num_inf / num_finite	value counts
inconsistent_blocks	True if a cell_data array's blocks disagree in component count

Unlike the other data operations, data_info never raises on non-finite values — it counts them, which is the point of the report. They are still excluded from min/max/mean, per the NaN policy. An inconsistent cell_data array is likewise reported rather than raised, so the rest of the summary stays usable.

CLI

meshioplusplus data info mesh.vtu           # human-readable table
meshioplusplus data info mesh.vtu --json    # machine-readable JSON

<meshio++ data summary>
  location    name                 dtype  comp  entries          min          max         mean   nan   inf
  --------------------------------------------------------------------------------------------------------
  point_data  T                    f8        1        6            0           12            6     0     0
  point_data  velocity             f8        3        6            0            2          0.5     0     0
  cell_data   mat                  f8        1        3            1            3            2     0     0

The Python CLI and the native binary produce the same table. See the CLI reference.

Other languages

• C API — mio_data_info_create(mesh) returns an opaque mio_data_info*; read it with mio_data_info_count, mio_data_info_name (caller-buffer protocol), mio_data_info_entry (fills a mio_data_array_info struct) and mio_data_info_component, then release it with mio_data_info_free. See the C API reference.
• Fortran — arrays = m%data_info(keys=names) returns an array of mio_data_array_info plus, optionally, the matching names. See the Fortran reference.
• WebAssembly / JavaScript — dataInfo(mesh) returns an array of objects with camelCase keys (numEntries, numComponents, minPerComponent, …). See the WebAssembly reference.