Equatch

99 rows, 5 columns.
Automatic saving of each cell.
Graph the data of each column with one click (button above the column).
Charts on widgets and watch faces.
Basic cell operations: + - * / ^
Constants: π (=pi) e (=eu)
Functions: sin(x) cos(x) tan(x) log(x) ln(x)
Sum: sum(x:y)
Arithmetic mean: ave(x:y)
Maximum value: max(x:y)
Minimum value: min(x:y)
Random number from 0 to 1: rnd
Round to integer: rou(x)
Row number as a number: row
Column number (a=1) as a number: col

Sample formulas:
=(-27)^(1/3)
=log(pi)^sin(eu)
=ave(b1:b12)
"Roll the dice":
=rou(rnd*5.999+0.5)

Variable button under the column:
- If the column is empty, the button (white arrow) fills it with numbers corresponding to the row numbers (1,2,3 ... 99)
- If the column is empty, when you enter a formula in row 99, the button (blue arrow) fills the entire column with that formula (if the formula references a cell in row 99, e.g. a99, the copied formula will adjust to the corresponding row, so row 98 will reference a98 ... row 1 will reference a1)
- The "trash" deletes data in the entire column (except for previously selected cells).
! The first tap selects the cell, the second tap activates edit mode.
! Undeleted (selected) cells must be deselected (by activating edit mode and exiting), otherwise they will be deleted after restarting the app.

Example function graph (x^3):
1. In cell A99, enter the formula =(row-50)^3
2. Under column A, press the button (blue arrow)
3. Above column A, press the button (chart)