Abstract: A calculating device capable of displaying constants and the method thereof are proposed. A key determination unit is provided in a calculator to determine the function of the pressed key of an input unit. A constant unit database is provided for storing constant data. A constant execution unit is provided to read out the content of the constant unit database according to the determination result of the key determination unit. An output unit is also provided to display the value, unit, symbol and item number of a constant. During operation, a user can directly input the item number of a constant in a constant menu frame. Or after a user switches the page of the constant menu frame to find out a desired constant, he can then directly input the constant to display the value, unit, symbol and item number of the constant.

Abstract: This invention relates to a method used to zoom in selective plot area in display, which method is inserted an inserted box into the display screen of a display device, and said inserted box can be removed to said display screen anywhere and the plot covered within said inserted box can be zoomed in according to predetermined zoom rate or zoom rate immediately set. Said method of this invention is applicable to a plotting calculator so that by way of keying in the keys of said plotting calculator the user can precisely and quickly select the plot area going to zoom in display.

Abstract: A calculating device capable of displaying constants and the method thereof are proposed. A key determination unit is provided in a calculator to determine the function of the pressed key of an input unit. A constant unit database is provided for storing constant data. A constant execution unit is provided to read out the content of the constant unit database according to the determination result of the key determination unit. An output unit is also provided to display the value, unit, symbol and item number of a constant. During operation, a user can directly input the item number of a constant in a constant menu frame. Or after a user switches the page of the constant menu frame to find out a desired constant, he can then directly input the constant to display the value, unit, symbol and item number of the constant.

Abstract: This invention relates to a method to display a statistical chart on scientific plotting type calculator, which is simulated a three-dimensional coordinates, with an axis X, an axis Y and a simulate axis T, to display several points represented as (x, y, t) on display screen. The way of this invention to display a simulated three-dimensional statistical chart on scientific plotting type calculator space is used several pairs of data as points constituted by series of X value and Y value, according magnitude in sequence of t value orderly to display those points and synchronously connected with line, to form a correlative statistical graph so that user can directly observe an interrelation between value of (x, Y) and t time value from display screen.

Abstract: This invention relates to a method used to zoom in selective plot area in display, which method is inserted an inserted box into the display screen of a display device, and said inserted box can be removed to said display screen anywhere and the plot covered within said inserted box can be zoomed in according to predetermined zoom rate or zoom rate immediately set.