data-matrix 0.2.0

Labeled numeric matrices with file ingest (CSV/TSV/etc.), symmetric fill, and fast label-based lookup.
Documentation 
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use thiserror::Error;

/// Custom error type for DataMatrix operations.
#[derive(Debug, Error)]
#[non_exhaustive]
pub enum Error {
    /// Row or column labels count does not match number of rows / columns
    #[error("The number of labels {expected} does not match the count anticipated from the data matrix {actual}")]
    IncorrectMatrixLabels { expected: usize, actual: usize },

    /// Line does not have enough columns.
    #[error("Line {line} does not contain enough columns (need at least {needed}): '{content}'")]
    NotEnoughColumns {
        line: usize,
        needed: usize,
        content: String,
    },

    /// More than one column found when expecting single column input.
    #[error("Line {line} has too many columns when expecting single value: '{content}'")]
    TooManyColumns { line: usize, content: String },

    /// Parsing error at a line.
    #[error("Invalid value at line {line}: '{content}'")]
    ParseError { line: usize, content: String },

    /// Incorrect number of data values; expected a square matrix packed row-wise.
    #[error(
        "Incorrect number of data values: {n_data}; expected a square matrix packed row-wise."
    )]
    WrongNumberOfData { n_data: usize },

    /// Generic I/O error.
    #[error("I/O error: {0}")]
    IoError(#[from] std::io::Error),
}