-
numpy.savetxt(fname, X, fmt='%.18e', delimiter=' ', newline='\n', header='', footer='', comments='# ')
[source] -
Save an array to a text file.
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 : 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 complexX
, the legal options forfmt
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 %+.4j %.4e %+.4j %.4e %+.4j?
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
andfooter
strings, to mark them as comments. Default: ?# ?, as expected by e.g.numpy.loadtxt
.New in version 1.7.0.
See also
-
save
- Save an array to a binary file in NumPy
.npy
format -
savez
- Save several arrays into an uncompressed
.npz
archive -
savez_compressed
- Save several arrays into a compressed
.npz
archive
Notes
Further explanation of the
fmt
parameter (%[flag]width[.precision]specifier
):- flags:
-
-
: left justify+
: Forces to precede result with + or -.0
: Left pad the number with zeros instead of space (see width). - width:
- Minimum number of characters to be printed. The value is not truncated if it has more characters.
- precision:
-
- For integer specifiers (eg.
d,i,o,x
), the minimum number of digits. - For
e, E
andf
specifiers, the number of digits to print after the decimal point. - For
g
andG
, the maximum number of significant digits. - For
s
, the maximum number of characters.
- For integer specifiers (eg.
- specifiers:
-
c
: characterd
ori
: signed decimal integere
orE
: scientific notation withe
orE
.f
: decimal floating pointg,G
: use the shorter ofe,E
orf
o
: signed octals
: string of charactersu
: unsigned decimal integerx,X
: unsigned hexadecimal integer
This explanation of
fmt
is not complete, for an exhaustive specification see [R280].References
[R280] (1, 2) Format Specification Mini-Language, Python Documentation. Examples
>>> x = y = z = np.arange(0.0,5.0,1.0) >>> np.savetxt('test.out', x, delimiter=',') # X is an array >>> np.savetxt('test.out', (x,y,z)) # x,y,z equal sized 1D arrays >>> np.savetxt('test.out', x, fmt='%1.4e') # use exponential notation
-
numpy.savetxt()
2017-01-10 18:18:35
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