tabsdata.tableframe.expr.expr.Expr.round_sig_figs#

Expr.round_sig_figs(digits: int) → Expr[source]#

Round floating point element values to the specified significant figures.

Parameters:: digits – number of digits to round up.

Example:

>>> import tabsdata as td
>>>
>>> tf: td.TableFrame ...
>>>
>>> tf.select(td.col("val"), td.col("val").round_sig_figs(2)
>>>   .alias("round_sig_figs"))
>>>
┌────────┬────────────────┐
│ val    ┆ round_sig_figs │
│ ---    ┆ ---            │
│ f64    ┆ f64            │
╞════════╪════════════════╡
│ 0.0123 ┆ 0.012          │
│ 2.0244 ┆ 2.0            │
│ 0.0    ┆ 0.0            │
│ inf    ┆ NaN            │
│ 50.0   ┆ 50.0           │
│ 1.0    ┆ 1.0            │
│ NaN    ┆ NaN            │
│ null   ┆ null           │
│ 112.0  ┆ 110.0          │
│ 2142.0 ┆ 2100.0         │
└────────┴────────────────┘