JPH01230160A - Electronic equipment - Google Patents

Abstract

PURPOSE:To calculate a part of a calculating expression, which has been once inputted, without a complicated operation by calculating a partial expression in a designated range, and displaying a calculation result on a display device. CONSTITUTION:By operating the whole expression inputted from a keyboard, 1, moving a cursor C to a desired digit position, and pushing down a designated key 4, designating marks P are set at plural points, and the partial expression between them is executed and displayed. In addition, the whole original expression can be displayed after the partial operation according to the operation of a restoring key 1c. Thus, the desired partial expression in the inputted calculating expression is calculated, and its result can be outputted.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application J] The present invention relates to an electronic device, and particularly to an electronic device having a display capable of displaying a calculation formula and its calculation result.

[Prior Art] Conventionally, in small electronic calculators such as electronic desktop calculators or hand belt computers, a mathematical formula is input, the mathematical formula is displayed on a display, and calculations are performed in response to a predetermined operation such as the equal key. Devices that output results (and formulas) are known. Also, with this type of device,
There is also known a system in which a desired part of the equation displayed on the display can be edited using a cursor and the calculation can be performed again.

[Problem to be Solved by the Invention] However, with the conventional device as described above, if you input a long formula and want to know the calculation result of only a part of it, you have to input only the necessary part again, or The only way to do the calculation was to delete all unnecessary parts by editing with a cursor.

For this reason, there is a problem that the operation is very troublesome, and the original formula is deleted, making recalculation troublesome.

An object of the present invention is to solve the above-mentioned problems and to make it possible to perform calculations on a part of an input formula without requiring any troublesome operations.

[Means for Solving the Problems] In order to solve the following problems, the present invention provides an electronic device having a display capable of displaying a calculation formula and its calculation result, in which calculations displayed on the display are provided. A configuration comprising a means for specifying a sub-expression within a desired range in the expression, and a control means for calculating the sub-expression within the specified range according to the specification of the specifying means and displaying the calculation result on the display device. It was adopted.

[Operation] According to the above configuration, it is possible to calculate a desired sub-formula in a manually-written calculation formula and output the result.

[Example] Hereinafter, the present invention will be described in detail based on the example shown in the drawings. FIG. 1 shows the operation surface of a scientific calculator, hand belt computer, etc., which employs the present invention.

In the figure, the symbol l indicates a keyboard, which includes a numeric keypad 1a, function keys 1b including four arithmetic operation keys, and cursor keys 3 for moving the cursor on the display 2 left and right. It is composed of an equal key 5 and a designation key 4. The function key ib also includes a return key IC for returning to the display of the original expression from a partial expression calculation, which will be described later.

A display 2 is provided above the keyboard 1 and has a multi-digit display using an LCD, LED, or the like. Numerical formulas can be entered on the display 2 by inputting from the numeric keypad 1a as shown.

Additionally, a cursor C is displayed to indicate the editing position of the formula being displayed. The cursor C can be moved left and right on the display one digit at a time using the cursor keys 3. Further, in this embodiment, the display 2 is configured so that a triangular designation mark P, for example, as shown in the figure, can be displayed above each display digit of the display 2. This designation mark P is displayed by operating the designation key 4, so that only the mathematical expressions surrounded by this designation mark P can be calculated.

FIG. 2 shows the structure of the control system of the device shown in FIG. In FIG. 2, reference numeral 1 denotes the keyboard shown in FIG. 1, which has a key matrix for detecting key presses such as a numeric keypad and function keys, and input information is stored in, for example, the L chip L chip.
It is input to the CPU II configured from the SI. C.P.U.I.
1 performs calculations according to input data from the keyboard 1 and displays the input formula or calculation result on the display 2. The display 2 is driven by a known display drive circuit 12.

The CPU II is a ROM1 l that stores the programs described below.
b, an arithmetic unit at 11 a that performs calculations, and R
It has AM11c.

The RAM 11c is used as a work area during calculations, and has an area lie for storing all formulas entered from the keyboard 1, and an area lid for storing the part of the formula for which the operator performs partial calculations. .

In this embodiment, as mentioned earlier, the entire expression input from the keyboard L is calculated, and the designation mark P is placed in multiple locations by moving the cursor C to a desired digit position and pressing the designation key 4. , calculate the subexpressions between them, and display them. Further, in response to the operation of the return key 1c, it is possible to display the entire thick formula of the partial calculation.

FIG. 3 shows the control procedure of the CPU II stored in the ROMI lb. The procedure shown in FIG. 3 is executed every time a predetermined manual power is applied.

In step S1 of FIG. 3, numerical formulas are sequentially input using the numeric keypad 1a. As in the past, when the equal key 5 is pressed after inputting a mathematical formula, the process moves to step S2, where the mathematical formula is calculated and the result is displayed together with "=".

In step S3, it is determined whether a subexpression has been specified using the specification key 4. If no designation has been made, the process moves to the next predetermined process, but if the designation mark P in FIG. teeth,
Proceeding to step S4, the mathematical formula data of the sub-formula in the range surrounded by the designated mark P is transferred to the storage area lid.

In step S5, it is determined whether the equal key 5 has been pressed. When the equal key 5 is pressed, the process proceeds to step S6, and the entire original formula data existing in the input buffer γ etc. is stored in the storage area lie. This is a process performed to display a thick expression of a partial calculation.

In step S7, the partial expression stored in the storage area lid is operated, and the result is displayed in step S8. At this time, the entire equation may be displayed along with the result.

In step S9, it is determined whether a return command has been issued using the mathematical return key 1c. When the mathematical formula return command is issued, the process moves to step 510, and the entire original mathematical formula stored in the storage area lie is redisplayed. At that time, the calculation results of the original expression may be displayed at the same time.

FIGS. 4(a) to 4(h) show the mathematical expression processing performed according to the above procedure. The left side of each figure shows the key operations.
The right side shows the display state of the display 2 at that time.

In FIG. 284 (&), when a numerical formula is input using the numeric keypad 1a, the input digits are displayed on the display 2 in sequence. As the input progresses, the cursor C moves sequentially to the end of the expression. After all 0 expressions have been input, when the equal key 5 is pressed, ";" and The calculation result "19" is output. Cursor C moves to the beginning of the expression in preparation for specifying the subexpression.

If the operator wishes to perform some calculations on the formula, use the method shown in Figure 4 (
Press the cursor key 3 as appropriate as shown in C), and press the cursor C
to the beginning of the desired subexpression. Next, Figure 4 (
d) Press the designated key 4 at position a. As a result, a designation mark P is displayed above the digit at the current cursor position, and the end of the subexpression is similarly designated.

That is, the cursor C is moved to the end of the sub-expression by pressing the cursor key 3 as shown in FIG. 4(e), and the designation key 4 is pressed as shown in FIG. 4(f). by this,
A designation mark P is displayed at the end of the subexpression.

Next, press the equal key 5 to calculate the subexpression.
When you press , the formula within the range specified by the designation mark P and its calculation result are displayed as shown in Figure 4 (g).
When a return command is issued using the return key 1c, since the entire original equation is stored in the storage area lie shown in Figure 2, this data can be used to restore the entire original equation and its contents as shown in Figure 4 (h). Calculation results can be displayed.

In this article, expressions involving only four arithmetic operations were exemplified, but similar processing can be used for expressions that include functional operations. Figure 5(a)
, (b) shows the input of the entire equation including two logarithmic operating terms and the output of the calculation result. Even in the case of such a formula,
In exactly the same manner as described above, by moving the cursor and operating the designation key 4 as shown in FIG. 5(C), designation marks P are displayed at the beginning and end of the desired sub-expression. If the equal key 5 is then pressed, the calculation result of the designated sub-expression can be output as shown in FIG. 5(d).

Alternatively, by further providing a large number of storage areas lid as shown in FIG. 2, it is possible to calculate only a further part of the sub-expression.For example, in the state shown in FIG. 5(c1), the cursor When the designation mark P is displayed by movement and operation of the designation key 4, and the equal key 5 is pressed, only the calculation result of that part can be output as shown in FIG. 5(f).

If it is possible to specify the operation of a subexpression multiple times in this way, multiple areas lie to store the original formula should also be provided, and each time a return command is issued, it is possible to return to the previous formula one step. Conceivable. Alternatively, the first expression may be returned to by the l operation.

Although the input/output method in which input is made from the keyboard and displayed on the display is shown above, the input/output method is not limited to this, and methods using a touch panel may also be used.For example, transparent electrodes may be used on the display 2. A touch panel is provided, and partial expressions are specified using this touch panel.

In such a configuration, as shown in FIG. 6(a), when a mathematical formula is entered using the keyboard 1 in the same manner as described above and the equal key 5 is pressed first, the calculation result is displayed as shown in FIG. 6(b). is output.

The touch panel on the display 2 has electrodes arranged so that it can detect the position of the display result on the display 2, and therefore the desired position on the display 2 can be specified by pressing down with a finger as shown in Fig. 6(C). Mark P
’ is displayed blinking. With the touch panel method, pressing the wrong button may occur, so instead of immediately determining the designated mark position, press the designated key 4 as shown in Figure 6(d) to make the designated mark P light up and designate it. Determine the mark position.

Another designation mark for closing the subexpression is also determined by touch key operations and pressing of the designation key 4, as shown in FIGS. 6(e) and 6(f).

By adopting such a method, a desired subexpression can be quickly specified without requiring many key operations unlike when moving a cursor using cursor keys.

Although we have not discussed moving the position of the specified mark above, it may be possible to erase the specified mark once input by pressing the specified key again at that position. You can correct the input of the designated mark.

[Effects of the Invention] As is clear from the above, according to the present invention, in an electronic device having a display capable of displaying a calculation formula and its calculation result, a desired range in the calculation formula displayed on the display is provided. and a control means for calculating the sub-expression within the specified range according to the specification of the specifying means and displaying the calculation result on the display. - It is possible to provide an excellent electronic device with good operability that can calculate a desired subformula part of a calculation formula once input and output the calculation result.

[Brief explanation of drawings]

Fig. 1 is an explanatory diagram showing the operation surface of an electronic device adopting the present invention, Fig. 2 is a block diagram of the control system of the device shown in Fig. 1, and Fig. 3 shows the control procedure of the CPU shown in Fig. 2. Flow chart diagrams, Figures 4(a) to (h) and Figures 5(a) to (f)
) is an explanatory diagram showing the operation of the device in Fig. 1, Fig. 6(a)
-(f) are explanatory diagrams showing different embodiments. 1...Keyboard 2...Display 3...
Cursor key 4...Specification key 5...Equal key 11...CPU1id, lie...Storage area 12...Display drive circuit Fig. 4 Fig. 5

Claims (1)

[Claims] 1) In an electronic device having a display capable of displaying a calculation formula and its calculation result, means for specifying a sub-formula in a desired range in the calculation formula displayed on the display; An electronic device comprising: a control means for calculating a sub-expression within a specified range according to a specification by the specifying means and displaying the calculation result on the display. 2) The electronic device according to claim 1, wherein after outputting the calculation result of the sub-expression, the display returns to the original expression in response to a predetermined operation input.