367 lines
12 KiB
Python
367 lines
12 KiB
Python
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from sympy.core.containers import Tuple
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from sympy.core.singleton import S
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from sympy.core.symbol import Symbol
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from sympy.core.sympify import SympifyError
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from types import FunctionType
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class TableForm:
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r"""
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Create a nice table representation of data.
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Examples
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========
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>>> from sympy import TableForm
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>>> t = TableForm([[5, 7], [4, 2], [10, 3]])
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>>> print(t)
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5 7
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4 2
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10 3
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You can use the SymPy's printing system to produce tables in any
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format (ascii, latex, html, ...).
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>>> print(t.as_latex())
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\begin{tabular}{l l}
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$5$ & $7$ \\
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$4$ & $2$ \\
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$10$ & $3$ \\
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\end{tabular}
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"""
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def __init__(self, data, **kwarg):
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"""
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Creates a TableForm.
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Parameters:
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data ...
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2D data to be put into the table; data can be
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given as a Matrix
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headings ...
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gives the labels for rows and columns:
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Can be a single argument that applies to both
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dimensions:
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- None ... no labels
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- "automatic" ... labels are 1, 2, 3, ...
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Can be a list of labels for rows and columns:
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The labels for each dimension can be given
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as None, "automatic", or [l1, l2, ...] e.g.
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["automatic", None] will number the rows
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[default: None]
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alignments ...
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alignment of the columns with:
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- "left" or "<"
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- "center" or "^"
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- "right" or ">"
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When given as a single value, the value is used for
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all columns. The row headings (if given) will be
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right justified unless an explicit alignment is
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given for it and all other columns.
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[default: "left"]
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formats ...
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a list of format strings or functions that accept
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3 arguments (entry, row number, col number) and
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return a string for the table entry. (If a function
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returns None then the _print method will be used.)
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wipe_zeros ...
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Do not show zeros in the table.
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[default: True]
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pad ...
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the string to use to indicate a missing value (e.g.
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elements that are None or those that are missing
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from the end of a row (i.e. any row that is shorter
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than the rest is assumed to have missing values).
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When None, nothing will be shown for values that
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are missing from the end of a row; values that are
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None, however, will be shown.
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[default: None]
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Examples
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========
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>>> from sympy import TableForm, Symbol
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>>> TableForm([[5, 7], [4, 2], [10, 3]])
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5 7
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4 2
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10 3
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>>> TableForm([list('.'*i) for i in range(1, 4)], headings='automatic')
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| 1 2 3
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---------
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1 | .
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2 | . .
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3 | . . .
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>>> TableForm([[Symbol('.'*(j if not i%2 else 1)) for i in range(3)]
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... for j in range(4)], alignments='rcl')
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.
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. . .
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.. . ..
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... . ...
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"""
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from sympy.matrices.dense import Matrix
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# We only support 2D data. Check the consistency:
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if isinstance(data, Matrix):
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data = data.tolist()
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_h = len(data)
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# fill out any short lines
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pad = kwarg.get('pad', None)
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ok_None = False
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if pad is None:
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pad = " "
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ok_None = True
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pad = Symbol(pad)
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_w = max(len(line) for line in data)
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for i, line in enumerate(data):
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if len(line) != _w:
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line.extend([pad]*(_w - len(line)))
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for j, lj in enumerate(line):
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if lj is None:
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if not ok_None:
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lj = pad
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else:
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try:
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lj = S(lj)
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except SympifyError:
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lj = Symbol(str(lj))
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line[j] = lj
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data[i] = line
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_lines = Tuple(*[Tuple(*d) for d in data])
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headings = kwarg.get("headings", [None, None])
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if headings == "automatic":
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_headings = [range(1, _h + 1), range(1, _w + 1)]
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else:
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h1, h2 = headings
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if h1 == "automatic":
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h1 = range(1, _h + 1)
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if h2 == "automatic":
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h2 = range(1, _w + 1)
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_headings = [h1, h2]
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allow = ('l', 'r', 'c')
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alignments = kwarg.get("alignments", "l")
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def _std_align(a):
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a = a.strip().lower()
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if len(a) > 1:
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return {'left': 'l', 'right': 'r', 'center': 'c'}.get(a, a)
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else:
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return {'<': 'l', '>': 'r', '^': 'c'}.get(a, a)
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std_align = _std_align(alignments)
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if std_align in allow:
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_alignments = [std_align]*_w
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else:
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_alignments = []
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for a in alignments:
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std_align = _std_align(a)
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_alignments.append(std_align)
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if std_align not in ('l', 'r', 'c'):
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raise ValueError('alignment "%s" unrecognized' %
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alignments)
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if _headings[0] and len(_alignments) == _w + 1:
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_head_align = _alignments[0]
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_alignments = _alignments[1:]
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else:
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_head_align = 'r'
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if len(_alignments) != _w:
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raise ValueError(
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'wrong number of alignments: expected %s but got %s' %
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(_w, len(_alignments)))
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_column_formats = kwarg.get("formats", [None]*_w)
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_wipe_zeros = kwarg.get("wipe_zeros", True)
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self._w = _w
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self._h = _h
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self._lines = _lines
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self._headings = _headings
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self._head_align = _head_align
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self._alignments = _alignments
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self._column_formats = _column_formats
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self._wipe_zeros = _wipe_zeros
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def __repr__(self):
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from .str import sstr
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return sstr(self, order=None)
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def __str__(self):
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from .str import sstr
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return sstr(self, order=None)
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def as_matrix(self):
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"""Returns the data of the table in Matrix form.
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Examples
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========
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>>> from sympy import TableForm
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>>> t = TableForm([[5, 7], [4, 2], [10, 3]], headings='automatic')
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>>> t
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| 1 2
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--------
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1 | 5 7
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2 | 4 2
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3 | 10 3
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>>> t.as_matrix()
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Matrix([
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[ 5, 7],
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[ 4, 2],
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[10, 3]])
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"""
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from sympy.matrices.dense import Matrix
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return Matrix(self._lines)
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def as_str(self):
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# XXX obsolete ?
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return str(self)
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def as_latex(self):
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from .latex import latex
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return latex(self)
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def _sympystr(self, p):
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"""
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Returns the string representation of 'self'.
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Examples
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========
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>>> from sympy import TableForm
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>>> t = TableForm([[5, 7], [4, 2], [10, 3]])
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>>> s = t.as_str()
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"""
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column_widths = [0] * self._w
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lines = []
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for line in self._lines:
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new_line = []
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for i in range(self._w):
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# Format the item somehow if needed:
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s = str(line[i])
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if self._wipe_zeros and (s == "0"):
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s = " "
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w = len(s)
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if w > column_widths[i]:
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column_widths[i] = w
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new_line.append(s)
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lines.append(new_line)
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# Check heading:
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if self._headings[0]:
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self._headings[0] = [str(x) for x in self._headings[0]]
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_head_width = max([len(x) for x in self._headings[0]])
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if self._headings[1]:
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new_line = []
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for i in range(self._w):
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# Format the item somehow if needed:
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s = str(self._headings[1][i])
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w = len(s)
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if w > column_widths[i]:
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column_widths[i] = w
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new_line.append(s)
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self._headings[1] = new_line
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format_str = []
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def _align(align, w):
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return '%%%s%ss' % (
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("-" if align == "l" else ""),
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str(w))
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format_str = [_align(align, w) for align, w in
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zip(self._alignments, column_widths)]
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if self._headings[0]:
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format_str.insert(0, _align(self._head_align, _head_width))
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format_str.insert(1, '|')
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format_str = ' '.join(format_str) + '\n'
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s = []
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if self._headings[1]:
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d = self._headings[1]
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if self._headings[0]:
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d = [""] + d
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first_line = format_str % tuple(d)
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s.append(first_line)
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s.append("-" * (len(first_line) - 1) + "\n")
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for i, line in enumerate(lines):
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d = [l if self._alignments[j] != 'c' else
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l.center(column_widths[j]) for j, l in enumerate(line)]
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if self._headings[0]:
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l = self._headings[0][i]
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l = (l if self._head_align != 'c' else
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l.center(_head_width))
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d = [l] + d
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s.append(format_str % tuple(d))
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return ''.join(s)[:-1] # don't include trailing newline
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def _latex(self, printer):
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"""
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Returns the string representation of 'self'.
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"""
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# Check heading:
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if self._headings[1]:
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new_line = []
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for i in range(self._w):
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# Format the item somehow if needed:
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new_line.append(str(self._headings[1][i]))
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self._headings[1] = new_line
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alignments = []
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if self._headings[0]:
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self._headings[0] = [str(x) for x in self._headings[0]]
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alignments = [self._head_align]
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alignments.extend(self._alignments)
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s = r"\begin{tabular}{" + " ".join(alignments) + "}\n"
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if self._headings[1]:
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d = self._headings[1]
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if self._headings[0]:
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d = [""] + d
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first_line = " & ".join(d) + r" \\" + "\n"
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s += first_line
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s += r"\hline" + "\n"
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for i, line in enumerate(self._lines):
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d = []
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for j, x in enumerate(line):
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if self._wipe_zeros and (x in (0, "0")):
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d.append(" ")
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continue
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f = self._column_formats[j]
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if f:
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if isinstance(f, FunctionType):
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v = f(x, i, j)
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if v is None:
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v = printer._print(x)
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else:
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v = f % x
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d.append(v)
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else:
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v = printer._print(x)
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d.append("$%s$" % v)
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if self._headings[0]:
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d = [self._headings[0][i]] + d
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s += " & ".join(d) + r" \\" + "\n"
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s += r"\end{tabular}"
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return s
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