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numpy.format_float_positional — NumPy v2.3 Manual

numpy.format_float_positional(x, precision=None, unique=True, fractional=True, trim='k', sign=False, pad_left=None, pad_right=None, min_digits=None)[source]#

Format a floating-point scalar as a decimal string in positional notation.

Provides control over rounding, trimming and padding. Uses and assumes IEEE unbiased rounding. Uses the “Dragon4” algorithm.

Parameters:

xpython float or numpy floating scalar

Value to format.

precisionnon-negative integer or None, optional

Maximum number of digits to print. May be None if unique is True, but must be an integer if unique is False.

uniqueboolean, optional

If True, use a digit-generation strategy which gives the shortest representation which uniquely identifies the floating-point number from other values of the same type, by judicious rounding. If precision is given fewer digits than necessary can be printed, or if min_digits is given more can be printed, in which cases the last digit is rounded with unbiased rounding. If False, digits are generated as if printing an infinite-precision value and stopping after precision digits, rounding the remaining value with unbiased rounding

fractionalboolean, optional

If True, the cutoffs of precision and min_digits refer to the total number of digits after the decimal point, including leading zeros. If False, precision and min_digits refer to the total number of significant digits, before or after the decimal point, ignoring leading zeros.

trimone of ‘k’, ‘.’, ‘0’, ‘-’, optional

Controls post-processing trimming of trailing digits, as follows:

• ‘k’ : keep trailing zeros, keep decimal point (no trimming)

• ‘.’ : trim all trailing zeros, leave decimal point

• ‘0’ : trim all but the zero before the decimal point. Insert the zero if it is missing.

• ‘-’ : trim trailing zeros and any trailing decimal point

signboolean, optional

Whether to show the sign for positive values.

pad_leftnon-negative integer, optional

Pad the left side of the string with whitespace until at least that many characters are to the left of the decimal point.

pad_rightnon-negative integer, optional

Pad the right side of the string with whitespace until at least that many characters are to the right of the decimal point.

min_digitsnon-negative integer or None, optional

Minimum number of digits to print. Only has an effect if unique=True in which case additional digits past those necessary to uniquely identify the value may be printed, rounding the last additional digit.

New in version 1.21.0.

Returns:

repstring

The string representation of the floating point value

Examples

>>> import numpy as np
>>> np.format_float_positional(np.float32(np.pi))
'3.1415927'
>>> np.format_float_positional(np.float16(np.pi))
'3.14'
>>> np.format_float_positional(np.float16(0.3))
'0.3'
>>> np.format_float_positional(np.float16(0.3), unique=False, precision=10)
'0.3000488281'

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