data matrix

https://doi.org/10.1351/goldbook.10047
Measurement results on a system arranged in a \(m \times n\) matrix, with \(m\) objects and \(n\) variables.
Notes:
  1. By convention a matrix is arranged with \(m\) rows and \(n\) columns.
  2. Objects are also called "samples", but confusion with physical "test samples" in analytical chemistry should be avoided.
  3. Variables are also called features, or explanatory variables.
  4. For multi-way data the data is arranged in a hypercube of \(m \times n_{1} \times n_{2} \times\) …, where \(n_{1}\), \(n_{2}\) … are the kinds of explanatory variable.
Source:
PAC, 2016, 88, 407. 'Vocabulary of concepts and terms in chemometrics (IUPAC Recommendations 2016)' on page 409 (https://doi.org/10.1515/pac-2015-0605)