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Empty cells are equivalent to Not-a-Number values.
Many table editing functions are available in table context menu.
Ctrl key (on Windows and Linux only) or
Alt key (on Mac OS X) and drag column header to rearrange table columns.
Alt keys are not pressed, mouse dragging on header will select the columns.
You can edit table cell by double click on it. You can either enter a number or an expression (e.g. writing
pi in cell equals to
1+2 equals to
3). See Formula section for syntax.