JPH0228753A - Numerical expression inputting and editing system - Google Patents

Abstract

PURPOSE:To make backspace to different character string or the deletion of a numerical expression sign possible, and to simplify the correction of a numerical expression, and to improve operability for the inputting and editing of a numerical expression by providing a control device with a numerical expression inputting part, a numerical expression indicating part, a character string designating part and a numerical expression editing part. CONSTITUTION:The control device 404 is constituted of the numerical expression inputting part 405, the numerical expression indicating part 406, the character string designating part 407 and the numerical expression editing part 408. Then, when a part of the numerical expression displayed on the display device 403 through the indicating part 406 is designated by an inputting device 401, a designated character or the designated numerical expression sign among data stored in a storage device 402 is retrieved by the designating part 407. Next, the editing part 408 performs the editing such as insertion, correction, etc., of the character or an argument obtained by the designating part 407. Besides, when a backspacing function is started, the device 404 deletes the numerical expression being displayed by the device 403, and the character or the numerical expression, etc., to be the object of the backspacing function is retrieved by the designating part 407 and the range of the data to be deleted is obtained, and is displayed again after the deletion of the data in the device 402. Thus, the operability for inputting and editing of the numerical expression can be improved.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a document creation device, and particularly to a mathematical expression editing device suitable for creating mathematical expressions and the like.

[Conventional technology]

The mathematical expression input function that has already been implemented accepts the input of character strings that have a hierarchical relationship, calculates the display position of each character string based on the hierarchical relationship, and is able to display it. However, when using the backward function to delete the character immediately before the cursor indicating the next character input position during input editing, it has been impossible to delete beyond character string divisions or to delete mathematical symbols.

[Problem that the invention seeks to solve]

Although the above-mentioned conventional technology allows a backward function within the same character string, it does not take into consideration backward movement to a different character string or deletion of mathematical symbols, and is therefore impossible.

An object of the present invention is to simplify the input/editing of character strings having a hierarchical relationship such as the above formula by providing a backward function that takes hierarchical relationships into consideration.

[Means for solving problems]

The above object can be achieved by adding to the prior art a means for determining the range to be deleted based on the dependency relationship of a group of character strings, and a means for deleting the data in the range determined by the above means and redisplaying the formula. .

[Effect]

The means for determining the deletion range based on the hierarchical relationship of a group of character strings determines the deletion range in consideration of the hierarchical relationship of mathematical expressions when the character to be deleted is a function symbol. delete data,
The means for redisplaying the formula deletes the data determined by the means for determining the deletion range described in 1. and redisplays the changed portion of the corresponding formula. When entering a group of strings that have a hierarchical relationship, such as in a mathematical formula, enter a symbol (hereinafter simply referred to as a delimiter) to indicate the separation of strings at the end of each string. However, when this delimiter is input, the above dependency relationship changes. The display position of these character strings differs depending on the hierarchical relationship, so when backing up beyond the character string division, you must not only delete the data, but also change the changed part of the formula based on the new formula data. Redisplay. Also, if the deleted data is a mathematical symbol,
After the deletion range is determined by the deletion range determining means, the formula is displayed again.

In this case, the dependency relationship of character strings refers to, for example, a mathematical expression relationship.

〔Example〕

Hereinafter, an embodiment in which the present invention is applied to a processor will be described with reference to the present invention.

The mathematical formula targeted by the present invention is shown in FIG. 3(a).

The characters that make up a mathematical formula are divided into regular characters and mathematical symbols. A mathematical symbol is a symbol with a special meaning used in mathematics, and in Figure 3 (a) it is Σ.

- (fractional bar), V, etc. Mathematical symbols have character strings attached to them, such as , to form the meaning of a mathematical formula. The character string attached to this function symbol is called an argument, and the mathematical symbol and its argument together are called a function. A number of these functions come together to form a mathematical expression.

Also, the above arguments may be just strings.

The arguments include other functions, forming a hierarchical structure. Figure 3(c) shows the hierarchical structure of the formula in Figure 3(a).
). When displaying mathematical formulas, it is necessary to calculate the size and coordinates of each character string according to the hierarchical structure of these mathematical formulas.

Next, the hardware configuration of the present invention will be explained. FIG. 4 is a diagram showing the equipment configuration of the present invention. The hardware to which the present invention is applied includes an input device 4.01 such as a keyboard for inputting character strings, mathematical symbols, etc., a storage device 402 for storing character codes of input characters, and a CR for displaying character strings, etc.
It is comprised of a display device 403 such as a T-display, and a control device 404 that controls each of the above components.

Of these, the control device 404 will be explained in detail.

The control device 404 includes a mathematical formula input section 405, a mathematical formula display section 4.
06, a character string specifying section 407, and a formula editing section 408.

(1) Mathematical formula input unit 405 As mentioned above, a mathematical formula is composed of a collection of functions. A function is formed by a mathematical symbol and an argument, but the number and display position of the attached arguments differ depending on the mathematical symbol. Therefore, the mathematical expression input unit 405 has a table (hereinafter simply referred to as an argument table) that summarizes the number of attached functions for all mathematical symbols.

When the user inputs a mathematical symbol from the input device 401, the mathematical formula input unit 405 calculates the number of arguments attached to the input mathematical symbol from the argument table, displays the mathematical symbol on the display device 403, and displays the first mathematical symbol. Prompt input of arguments.

The user inputs a character string constituting an argument, and inputs a delimiter at the end of the argument to indicate that one number has ended.

The formula input unit 405 guides the input of arguments equal to the number of arguments determined from the argument table. The input formula symbols, arguments, and delimiters are numbered 1 in the order of input as shown in Figure 3(b).
The data are arranged in columns and stored in the storage device 402.

(2) Mathematical formula display section 406 In order to display mathematical formulas, instead of characters or lines with fixed sizes, two-dimensional areas of different sizes are basically considered, and these are displayed according to the type of mathematical symbol. They must be placed vertically or horizontally.

That is, it is necessary to set the size of an area (hereinafter referred to as an argument area) for each mathematical symbol and argument, and to arrange each argument at a fixed position depending on the type of mathematical symbol. In this case, the arrangement method for each mathematical symbol is stored in the block diagram.

This will be explained specifically using the above formula as an example.

Σ　Xj j=1 E... uninput argument Define the size of the above argument area as follows.

Σ...], eng], x, lengthly (first argument) i =]-1eng2x, length2y (second
Argument) 1i length, length (3rd argument) X i -4eng4x, length4y
(Fourth argument) Also, each argument area has its own horizontal character string reference line (hereinafter referred to as the baseline), and these are set as base, base2, etc. as above. base
3. Set it to base4.

The size of the argument area for Σ, i=1, H, and Xi is determined from the total width and maximum height of the characters included in each argument. If the argument is not input, the size is fixed (hereinafter referred to as the uninput area).

The baseline varies depending on the type of mathematical symbol, but character string...character string height Σ...(length to top of Σ/2) + (normal character height/2) Fraction...Numerator 10 Normal character A/2 Uninput argument: Set to the height of a half-width character.

In the above formula, each baseline is base],
= (length/2) + (normal character height/2
) b a se 2 = l-e n g 2 yb
ase3=length3y base4=leB4y.

Next, change the above formula to Σ　　　　　　・・・a i=1 XI　　　　　　　...b Divide it into 2 and calculate the size of each using the formula below.

], engax = max (lenglx, l
eng2x, length) length =
length + length2y + length3yJ, eng
bx=length4x lengthby=leB4y basea=J, eng3y+baselbaseb=
], eng2y Based on the obtained data of a and b, the position of each argument is set by arranging a and b so that each baseline coincides with the X direction (FIG. 5).

In the above processing, if there is a function among the arguments and the size of the argument cannot be determined, the size of the inner function is determined using the same procedure, and then the size of the argument is calculated.

If the hierarchical structure of the function is deeper, the process is repeated while performing recursive calls until the size of the argument to be determined is determined, and the size and coordinates of the argument are determined.

(3) Character string specification section 407 When a part of the mathematical expression displayed by the mathematical expression display section is specified using an input device, the location of the specified character or mathematical symbol among the data stored in the storage device 404 is displayed. search for.

(4) Numerical formula editing section 408 Edits, such as inserting and correcting, the characters or number of characters determined by the character string specifying section. The input method is the same as that of the character string input section, and when storing in the storage section, the re-input character string data is inserted into the specified character string position.

Next, the retracting function of the device comprising the above mechanism will be explained.

As mentioned above, since mathematical expressions have a two-dimensional spread, different from the case of ordinary character strings, two-dimensional control must be performed in consideration of the meaning of the mathematical expression in the backward function. For example, if the cursor is at the beginning of the second argument of Σ as shown in Figure 2 (a), the backward function will delete the delimiter indicating the end of the first argument (Figure 2 (b)), Figure 2 (c) If the cursor is at the beginning of the first argument of Σ,
In order not to break the formula, we must delete not only Σ but also its argument (Figure 2(d)).

FIG. 1 shows the flowchart 1 of the backward function taking the above into consideration. When the reverse function is activated, the control device 40
Step 4 erases the corresponding formula displayed on the display device 403 (step 101).

Next, the character string specifying section in the control device 404 searches for characters to be subjected to the backward function (step 102). If the target character is a mathematical symbol, the number of arguments is determined from the argument table (step 104), and the range in which data is to be actually deleted is determined (step 105).

After the data on the storage device 402 is deleted in step 106, it is displayed on the display device head 403 again in step 107.

Although the present invention has been explained using mathematical formulas as an example, it is clear that the present invention can also be applied to inputting chemical formulas and musical scores.

〔Effect of the invention〕

According to the present invention, it is possible to delete the character input immediately before the cursor position, which was not considered in the formula input editing device, simplifying the correction of formulas and improving the operability of formula input editing. can do.

[Brief explanation of the drawing]

Engraving of the drawings (no changes in content) Figure l Figure 1 is a diagram showing the flowchart of the present invention, / Figures 2 (a) to (d) are diagrams showing the movement of the present invention on the screen, FIG. 3(a) is a diagram showing an example of a mathematical formula handled by the present invention, FIG. 3(b) is a diagram showing its data structure, and FIG.
c) Figure 4 is a diagram showing the hierarchical structure, Figure 4 is a diagram showing the hardware configuration to which the present invention is applied, and Figure 5 is a diagram showing how to obtain the display coordinates of a mathematical formula in the present invention. 101... Numerical formula deletion step, 102... Deletion target search step, 103... Deletion target determination step, 10
4... Argument number search step, 105 Deletion range determination step, 106... Data deletion step, 107...
・Formula redisplay step

Claims (1)

[Scope of Claims] 1. Means for displaying document information on a display device and inputting a group of character strings having a hierarchical relationship between character strings like a mathematical formula according to an instruction from an input device; It has a means for displaying a group of character strings, a means for analyzing the hierarchical relationship, a means for storing the hierarchical relationship, and a means for modifying each character string in the group of character strings created by the means. A mathematical input/edit method in a document creation device, comprising means for deleting a character immediately before a next character input position and a character string having a hierarchical relationship with that character in a single operation according to the hierarchical relationship. 2. In the mathematical input/editing device according to claim 1, when a string of characters continues in the hierarchy below the deletion target character before the next character input position, the deletion target character and the hierarchy below it A formula input editing method characterized by deleting character strings at the same time. 3. In the mathematical formula input editing device according to claim 1 or 2, even if the next character input position is in the middle of the mathematical formula, the character to be deleted and the character string in the hierarchy below it are simultaneously deleted. A mathematical formula input/editing device featuring: