JPH0736835A - Electronic computer - Google Patents

Abstract

PURPOSE:To simply input/display the definition of a variable in addition to the display of the variable and a variable value inputted to the variable during the execution of a formula storage. CONSTITUTION:This system is constituted of a central processing unit (CPU) 31 for executing key entry, operation, etc., a read-only memory (ROM) 32 storing various programs and CG for displaying alphabets or the like, a RAM 33 to be a readable/writable memory for storing a variable name, variable value and a comment or the like for the variable, a KEY detecting circuit 34 for detecting which key on a key matrix is depressed, an LCD 35 to be a display element consisting of an LCD for displaying the comment or the like, and an LCD driving circuit 36 for controlling display.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electronic computer such as a portable computer or a scientific calculator.

[0002]

2. Description of the Related Art A conventional electronic computer inputs and stores a plurality of mathematical expressions, sets numerical values for respective variables of the mathematical expressions, and executes calculations.

[0003]

DISCLOSURE OF THE INVENTION In the prior art,
When you run the formula, you can see the variable name and the number entered in it. Then, in general, the variable name is assigned so that the alphabet and the meaning of the variable correspond to each other as much as possible, so that it is possible to understand what the variable name represents. For example, a variable indicating time is "T", a variable indicating voltage is "V", and so on. However, in the case of an expression having a plurality of similar units, for example, in an expression that uses two voltages V1 and V2, both cannot be set to V, so it is necessary to set separate variable names. For example, V1 is V, V2 is W, and so on. At this time, when I am storing multiple formulas or when it has been quite a while since I entered and remembered the formulas, I forgot what the variables currently displayed represent in the formulas. It may happen. In this case, you have to check the formula again, which is very troublesome. Also, to prevent this, it is necessary to create a table etc. that targets the meanings used in variables and mathematical expressions in advance, and execute the mathematical expressions while referring to them, and calculate automatically Even though it is a computer with functions, it is very inconvenient because it requires human intervention.

It is an object of the present invention to display a variable and a variable value input therein while the formula is being stored, and to easily input / display the definition of the variable.

[0005]

The present invention has been made for the purpose of solving the above-mentioned problems. In the invention according to claim 1, a plurality of mathematical expressions are inputted and stored, and numerical values are stored in respective variables of the mathematical expressions. In the electronic computer that sets and executes the calculation, the definition input means for inputting the definition of each variable of the mathematical formula, the definition storage means for storing the definition input by the definition input means, and the definition storage means And a definition output means for outputting the stored definition.

[0006]

According to the present invention, it is possible to easily know what the currently displayed variable represents in the mathematical expression while executing the mathematical expression storing function, and to refer to the mathematical expression one by one or check the variable and the meaning in the mathematical expression. You don't have to refer to the summary table.

If the unit for the variable according to the present invention is stored in the definition, the unit of the variable can be easily referred to when inputting the variable.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS In FIG. 1, the appearance of a scientific calculator of the present invention is divided into a display section 1 and a key section 2. The display unit 1 is DOTM
It is an LCD composed of ATRIX, and can display input function names, numbers, alphabets, etc. Here, the display of 1LINE is shown, but 2LINE is displayed.
It doesn't matter if there are more.

In the key unit 2, reference numeral 21 is an [ON / C] key (ON / CLEAR key) for turning on the power or clearing an input expression or the like. 22 is an [AER] key for designating the AER mode (mathematical expression storage mode),
It is a toggle key that alternately sets the calculation mode and the AER mode each time the key is operated. 23 is AE
Use the [1:] key to specify the expression entered in R mode.
"1" of "1:" indicates a stored area.
Reference numerals 24 are alphabetic keys [A] to [Z] for inputting variable names and comments. 25 is an [a / b] key for inputting a fraction. 26 is an [X ² ] key for designating the square calculation. Reference numeral 27 is a key for realizing the present invention, and is a [COMMENT] key for designating a comment input state for a variable during expression input and displaying a comment during expression execution. 28 is a [0] to [9] key for inputting a numerical value. Reference numeral 29 is a [+] [-] [x] [/] key for designating addition, subtraction, multiplication and division. 30 is an [ENT] for ending the input of the comment to the expression or the variable or for inputting the variable value and proceeding to the next mathematical expression execution.
ER] key.

In FIG. 2, the system of the present invention is a CP
U31, ROM 32, RAM 33, and KEY detection circuit 34
And an LCD 35 and an LCD drive circuit 36.
The CPU 31 is a central processing unit that reads out a program stored in the ROM 32, and executes and controls key input, calculation, formulas, and display processing. The ROM 32 is a read-only memory that stores programs and function names for executing and controlling key inputs, calculations, expressions, and displays, and CGs (character generators) for displaying numerical values, alphabets, and the like. RAM33 is a variable name,
It is a readable / writable memory that stores variable values, comments for variables, calculation registers, and the like. The KEY detection circuit 34 is a circuit for detecting which key on the key matrix is operated when the key is operated and transmitting the detected key to the CPU 31. The LCD 35 is an LCD for displaying an expression, a calculation result, a variable name, a comment for the variable, and the like.
It is a display element made of. The LCD drive circuit 36 is a CP
This is a device for performing control for displaying the display information from U31 on the LCD 35.

The following is an example in which the formula (equation 1 shown below) for calculating the distance t seconds after the constant acceleration linear motion used in physics is stored and executed by the scientific calculator according to the present invention.

[0012]

[Equation 1]

When inputting the above formula to the scientific calculator of the present invention, the variables on the formula are applied as follows. Vo →
A, a → B, t → C. In short, input and memorize the formula of the following formula 2 into the scientific calculator.

[0014]

[Equation 2]

Based on FIG. 3, the operation of inputting the comment of each variable together with the formula 2 will be described.

When the [AER] key 22 is operated to enter the AER mode (mathematical expression storage mode), the [1:] key 23 is operated to select the storage area "1:".
Ation? Is displayed on the display unit 1 (Fig. 3
(A)). Alphabetic keys [A] ~ [Z] 24 and [+] [-] [× ] [/] When you enter a number 2 by operating the key 29 is displayed on the display unit 1 and the "AC + 1 / 2BC ^2" ( FIG. 3B). The cursor movement key (not shown) is operated to move the cursor to the position of the variable "A" (FIG. 3 (c)). In this state, [COMMENT] key 27
When is operated, the comment input screen for variable A is displayed (Fig. 3
(D)). By operating the alphabet keys [A] to [Z] 24, the comment "SHOSOKU" of the variable A is input (FIG. 3 (e)). When the input of the comment of the variable A is confirmed by operating the “ENT” key 30, the display unit 1 displays [A
C + 1 / 2BC ² ] is displayed again (FIG. 3 (f)).

By operating a cursor movement key (not shown),
Move the cursor to the position of variable "B" (Fig. 3
(G)). As in the case of the variable "A", [COMMEN
Following the T] key 27, alphabet keys [A] ~
Operate the [Z] 24 to change the comment “KASOK” of the variable B.
Input "UDO" (FIG. 3 (h)). [ENT] key 3
After operating 0, operate the cursor movement key (not shown)
Move the cursor to the position of the variable "C" (Fig. 3
(I)). The [COMMENT] key 27 and then the alphabet keys [A] to [Z] 24 are operated to input the comment "JIKAN" of the variable C (FIG. 3 (j)).
The [ENT] key 30 is operated to confirm the input of the comment of the variable C (FIG. 3 (k)).

As described above, after entering the mathematical expression, the cursor is moved to the variable for which the comment is to be entered, and the [COMMEN is entered.
[T] key 27 operation → comment input → [ENT] key operation to repeat comment determination for each variable.

Next, based on FIG. 4, input according to the procedure of FIG.
The operation of referring to the comment of each variable of the stored formula and inputting a numerical value will be described.

The [AER] key 22 is operated to enter the calculation mode (FIG. 4 (a)). The [1:] key 23 is operated to select the mathematical expression storage area "1:". According to the procedure of FIG.
Since the formula 2 is stored in the formula storage area “1:”, the numerical value of the variable A among the variables A, B, and C is input first, and the display unit 1 displays “A = 0. Is displayed (FIG. 4B). When the [COMMENT] key 27 is operated in this state, the comment “SHOSOK” of the variable A is
"U" is displayed and the contents can be confirmed (Fig. 4 (c)).
When the [COMMENT] key 27 is operated again,
Returns to the original display. (FIG.4 (d)). Initial speed 1 for variable A
Enter 00 (FIG. 4 (e)). When the [ENT] key 30 is operated to confirm the numerical value input of the variable A, "B = 0" is displayed on the display unit 1 and the numerical value input state of the variable B is entered.
Then, the [COMMENT] key 27 is operated to confirm the comment (FIG. 4 (g)), and then the acceleration 25 is input to the variable B (FIG. 4 (h)). Similarly, the comment is confirmed for the variable C (FIG. 4 (i)), and the time 3 is input (FIG. 4).
(J)). When the [ENT] key 30 is operated, all variables have been input, so a mathematical expression is calculated and the calculation result “41
2.5 "is displayed.

Next, based on the flow chart of FIG. 5, the [COMMENT] key 27 in the operation procedure of FIG. 3 and FIG.
The operation of will be described.

When the [COMMENT] key 27 is operated, it is judged whether or not the operated state is the formula input (whether the formula storage mode or the calculation mode) (step 1), and the formula input. Medium (in formula storage mode)
Proceed to step 2 and proceed to step 4 if the formula is not being input (in the calculation mode). In step 2, if the cursor position is in the variable (YES), the comment input process for the variable in that position is performed (step 3).
On the other hand, if it is in the variable input waiting state in step 4 (YES), the process proceeds to step 5 and it is determined whether or not the comment is being displayed. If the comment is being displayed (YES), the variable value is displayed instead of the displayed comment (step 6). If the comment is not being displayed (NO), the comment is displayed (step 7).

[0023]

According to the present invention, while executing the formula storing function,
You can easily know what the currently displayed variable represents in the formula, and you do not need to refer to each formula or the table that summarizes the variables and their meanings in the formula.

If the unit for a variable is stored in the definition according to the present invention, the unit of the variable can be easily referred to when the variable is input.

[Brief description of drawings]

FIG. 1 is an external view of a scientific calculator of the present invention.

FIG. 2 is a system block diagram of the present invention.

FIG. 3 is a diagram showing an operation procedure for comment input according to the present invention.

FIG. 4 is a diagram showing an operation procedure regarding comment output according to the present invention.

FIG. 5 is a flowchart showing the operation of a [COMMENT] key.

[Explanation of symbols]

1 Display Part 2 Key Part 21 [ON / C] Key 22 [AER] Key 23 [1:] Key 24 Alphabet Key 25 [a / b] Key 26 [X ² ] Key 27 [COMMENT] Key 28 [0] ~ [9] key 29 [+] [-] [x] [/] key 30 [ENTER] key 31 CPU 32 ROM 33 RAM 34 KEY detection circuit 35 LCD 36 LCD drive circuit

Claims (1)

[Claims] 1. An electronic computer for inputting and storing a plurality of mathematical expressions, setting numerical values for respective variables of the mathematical expressions, and executing a calculation, and a definition inputting means for inputting the definition of each variable of the mathematical expression. An electronic computer comprising: a definition storage unit that stores the definition input by the definition input unit; and a definition output unit that outputs the definition stored in the definition storage unit.