numpy.savetxt参数

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本文详细介绍了如何使用numpy库中的savetxt函数将数组数据保存为文本文件，包括参数说明如文件名、数据格式、分隔符等，以及新版本中添加的特性如头尾注释和编码选项。

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numpy.savetxt(fname, X, fmt='%.18e', delimiter=' ', newline='n', header='', footer='', comments='# ', encoding=None)[source]

Save an array to a text file.

Parameters:

Parameters:	fname : filename or file handle If the filename ends in `.gz`, the file is automatically saved in compressed gzip format. `loadtxt`understands gzipped files transparently. X : 1D or 2D array_like Data to be saved to a text file. fmt : str or sequence of strs, optional A single format (%10.5f), a sequence of formats, or a multi-format string, e.g. ‘Iteration %d – %10.5f’, in which case delimiter is ignored. For complex X, the legal options for fmt are: a single specifier, fmt=’%.4e’, resulting in numbers formatted like ‘ (%s+%sj)’ % (fmt, fmt) a full string specifying every real and imaginary part, e.g. ‘ %.4e %+.4ej %.4e %+.4ej %.4e %+.4ej’ for 3 columns a list of specifiers, one per column - in this case, the real and imaginary part must have separate specifiers, e.g. [‘%.3e + %.3ej’, ‘(%.15e%+.15ej)’] for 2 columns delimiter : str, optional String or character separating columns. newline : str, optional String or character separating lines. New in version 1.5.0. header : str, optional String that will be written at the beginning of the file. New in version 1.7.0. footer : str, optional String that will be written at the end of the file. New in version 1.7.0. comments : str, optional String that will be prepended to the `header` and `footer` strings, to mark them as comments. Default: ‘# ‘, as expected by e.g. `numpy.loadtxt`. New in version 1.7.0. encoding : {None, str}, optional Encoding used to encode the outputfile. Does not apply to output streams. If the encoding is something other than ‘bytes’ or ‘latin1’ you will not be able to load the file in NumPy versions < 1.14. Default is ‘latin1’. New in version 1.14.0.

fname : filename or file handle

If the filename ends in .gz, the file is automatically saved in compressed gzip format. loadtxtunderstands gzipped files transparently.

X : 1D or 2D array_like

Data to be saved to a text file.

fmt : str or sequence of strs, optional

A single format (%10.5f), a sequence of formats, or a multi-format string, e.g. ‘Iteration %d – %10.5f’, in which case delimiter is ignored. For complex X, the legal options for fmt are:

a single specifier, fmt=’%.4e’, resulting in numbers formatted like ‘ (%s+%sj)’ % (fmt, fmt)
a full string specifying every real and imaginary part, e.g. ‘ %.4e %+.4ej %.4e %+.4ej %.4e %+.4ej’ for 3 columns
a list of specifiers, one per column - in this case, the real and imaginary part must have separate specifiers, e.g. [‘%.3e + %.3ej’, ‘(%.15e%+.15ej)’] for 2 columns

delimiter : str, optional

String or character separating columns.

newline : str, optional

String or character separating lines.

New in version 1.5.0.

header : str, optional

String that will be written at the beginning of the file.

New in version 1.7.0.

footer : str, optional

String that will be written at the end of the file.

New in version 1.7.0.

comments : str, optional

String that will be prepended to the header and footer strings, to mark them as comments. Default: ‘# ‘, as expected by e.g. numpy.loadtxt.

New in version 1.7.0.

encoding : {None, str}, optional

Encoding used to encode the outputfile. Does not apply to output streams. If the encoding is something other than ‘bytes’ or ‘latin1’ you will not be able to load the file in NumPy versions < 1.14. Default is ‘latin1’.

New in version 1.14.0.