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// SPDX-License-Identifier: MIT OR Apache-2.0
//
// Copyright 2022-2025, John McNamara, jmcnamara@cpan.org
//! An example of writing a Polar Rust dataframe to an Excel file. This
//! demonstrates handling NaN and Infinity values with custom string
//! representations.
use polars::prelude::*;
use polars_excel_writer::PolarsExcelWriter;
fn main() -> PolarsResult<()> {
// Create a sample dataframe for the example.
let df: DataFrame = df!(
"Default" => &["NAN", "INF", "-INF"],
"Custom" => &[f64::NAN, f64::INFINITY, f64::NEG_INFINITY],
)?;
// Create a new excel writer.
let mut excel_writer = PolarsExcelWriter::new();
// Set custom values for NaN, Infinity, and -Infinity.
excel_writer.set_nan_value("NaN");
excel_writer.set_infinity_value("Infinity");
excel_writer.set_neg_infinity_value("-Infinity");
// Autofit the output data, for clarity.
excel_writer.set_autofit(true);
// Write the dataframe to Excel.
excel_writer.write_dataframe(&df)?;
// Save the file to disk.
excel_writer.save("dataframe.xlsx")?;
Ok(())
}