Struct ndarray_npy::NpzWriter [−][src]
Expand description
Writer for .npz
files.
Note that the inner ZipWriter
is wrapped in a BufWriter
when
writing each array with .add_array()
. If desired,
you could additionally buffer the innermost writer (e.g. the
File
when writing to a file) by wrapping it in a
BufWriter
. This may be somewhat beneficial if the arrays are large and
have non-standard layouts but may decrease performance if the arrays have
standard or Fortran layout, so it’s not recommended without testing to
compare.
Example
use ndarray::{array, Array1, Array2};
use ndarray_npy::NpzWriter;
use std::fs::File;
let mut npz = NpzWriter::new(File::create("arrays.npz")?);
let a: Array2<i32> = array![[1, 2, 3], [4, 5, 6]];
let b: Array1<i32> = array![7, 8, 9];
npz.add_array("a", &a)?;
npz.add_array("b", &b)?;
npz.finish()?;
Implementations
Create a new .npz
file without compression. See numpy.savez
.
Creates a new .npz
file with compression. See numpy.savez_compressed
.
Adds an array with the specified name
to the .npz
file.
Calls .finish()
on the zip file and
.flush()
on the writer, and then returns the writer.
This finishes writing the remaining zip structures and flushes the
writer. While dropping will automatically attempt to finish the zip
file and (for writers that flush on drop, such as
BufWriter
) flush the writer, any errors that
occur during drop will be silently ignored. So, it’s necessary to call
.finish()
to properly handle errors.