JPH04169960A - Small electronic calculator with graph display function - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] This invention relates to a small electronic calculator with a graph display function.

[Prior Art] Conventionally, a small electronic calculator with a graph display function that displays a graph according to an input functional formula has been considered. In this case, scroll keys are provided to view the top, bottom, right, and left of the displayed graph.

The scroll key consists of four keys corresponding to the up, down, left, and right directions, and when the scroll key is operated, the display range moves.

[Problems to be solved by the invention] However, in conventional small electronic calculators with a graph display function, the scrolling range by one operation of the scroll key is small, so if the part you want to see is far from the displayed part, There was an inconvenience that the scroll key had to be operated many times and it took time.

This invention has been made to solve the above problems, and an object of the present invention is to provide a small electronic calculator with a graph display function that allows you to quickly view a desired part of a graph with simple operations.

[Means for Solving the Problems] In order to solve the above problems, the present invention provides a functional formula y=f(
Range data (X m
A range data storage means for storing (ln+X max+ Y m1ruY□ mln+ X@a
) c respectively, and by operating the vertical scroll key, add the integer multiple of the calculation result of (Ymax - Y,, wa) to the range data Y mln + Y,, ax, respectively. range data (Xm
1n+ xw+aXI Yllllllll Ymax)
By operating the keys, the range data can be changed by the entire screen range at once to create a graph of the functional formula y:f(X) based on , and the graph display range can be scrolled screen by screen.

[Example code] Hereinafter, one embodiment of the present invention will be described based on the drawings.

FIG. 1 is a block diagram showing the circuit configuration of a small electronic calculator with a graph display function to which the present invention is applied.

The key human power section 1 has numerical/character keys 1as graph (Gra
ph) Key 1b1 It is equipped with various keys such as a scroll key 1cv and a function key (not shown), and outputs a key human power signal to the control unit 2 according to the key human power. In this case, the scroll key 1c has four keys, namely the down scroll key "
↓", up scroll key "↑", left scroll key "←"
”, O, and the right scroll key “→”. The down scroll key "↓" and the up scroll key "↑" are vertical scroll keys that scroll the screen vertically.
Left scroll key "←" and right scroll key "→"
This is a horizontal scroll key that scrolls the screen horizontally.

The control section 2 controls each section based on a control program stored in a ROM (not shown), and is connected to an input buffer 3 that stores numerical data input by the key input section 1.

The input buffer 3 is connected to the RAM 4 and the calculation section 5.

The RAM 4 stores various data such as numerical data read from the input buffer 13 and calculation data calculated by the calculation unit 5. As shown in FIG. 1, this RAM 4 has the following configuration:
b1Y,...Register 4 Cs Y +++Ax register 4d, A register 4e, B register 4f1, and formula register 4g.

The X1□ register 4a is a register in which range data X1° indicating the minimum range in the X-axis direction is stored. X mh
The x register 4b is a register in which range data X wax indicating the maximum range in the X-axis direction is stored. Y m
The I n register 4C is a register in which range data Y m l n indicating the minimum range in the Y-axis direction is stored.

The Y wax register 4d contains range data Yl11. x is the register to be stored.

The A register 4e is a register in which data A indicating the range width in the Y-axis direction determined by calculation is stored. The B register 4f is a register in which data B indicating the range width in the X-axis direction determined by calculation is stored.

The formula register 4g is a register in which the function formula y=f(xL) inputted by the key manual unit 1 or the function formula V=f(x) stored in advance in a ROM or the like is stored.

The calculation unit 5 executes calculation processing based on calculation instructions from the control unit 2 and outputs the calculation results to the display buffer 6. The display buffer 6 has a storage capacity for at least one screen of the display section 7, and outputs the stored display data to the display section 7 based on instructions from the control section 2. The display section 7 is, for example, a dot matrix type liquid crystal display panel having a configuration of 64 dots (vertical) x 96 dots (horizontal), and based on the display data output from the display buffer 6, displays the numerical value of the calculation data or the function formula of the formula register 4g. Display a graph based on

Next, the operation of the above embodiment will be explained. FIG. 2 is a flowchart showing operations performed by operating the scroll key 1c.

First, in step S1, it is determined whether a graph is being displayed. If the determination in step S1 is NO, other processing is executed, but if the scroll key 1c is operated while the graph is being displayed, the determination is YES and the process proceeds to step S2.

In step S2, r Y max - Y mtll
J, that is, range data Y□8 to range data Y m I
n is subtracted, and the result of the operation is stored in A register 4e. That is, data A indicating the range width in the Y-axis direction is
It is stored in register 4e. Also, “X□8-X, wa”
That is, from range data X,, □ to range data X m I
f+ is subtracted, and the result of the operation is stored in the B register 4f. That is, data B indicating the range width in the X-axis direction is stored in the B register 4f.

In this case, the range data rX, , = 300. X,,n
=200. Ymin=100. Y, 1. It is assumed that =OJ is set in the range data setting mode. Then, by executing step S2, "A=100, B=100
It becomes J.

In the next step S3, the operated scroll key 10
is the up scroll key "↑" or the down scroll key "↓"
” is determined. If YES in step S3, proceed to step S4 and N.

If so, proceed to step Sll.

In step S4, the operated scroll key 1
It is determined whether or not c is the downward scroll key "↓". If No in step S4 (i.e. up scroll key "↑")
If the answer is YES, the process advances to step S8.

■ Operation of the up scroll key "↑" First, range data rX,...=300. X,,,,=
200,Y,,□=100. In the state of “Y□1゜=0”,
If the upward scroll key "↑" is operated, YES is determined in step S4, and step S5 is executed.

In step S5, it is determined whether numerical data has been inputted into the input buffer 3 or not. If the up scroll key "↑" is operated without inputting numerical data, the result is NO and the process proceeds to step S6. In step S6, "1" is written to the n register (not shown),
Proceed to step S7.

For example, if the numerical data "2" is input and the up scroll key "↑" is operated, YES is selected in step S5.
The numerical data "2" stored in the manual buffer 3 is then written to the n register, and the process advances to step S7.

In step S7, ' Y +++ax + n A J
The calculations r Y m+u + n A J are executed. That is, if n=2, range data Y,
,, n (=2) times the data Ar10OJ is added to rloOJ, and the range data Y +++ax becomes r300J. Further, n (=2) times the data Ar10OJ is added to the range data ymln roJ, and the range data Y va I n becomes r200J. Step S7
The process then proceeds to step 518.

In step 818, new range data rX-, set by executing step S7.

=300. X, , n=200. Yll,,=300.
Y.

, = 200J. That is, graph display data calculated based on the functional formula y=f(x) stored in the formula register 4g is written into the display buffer 6, and the graph is displayed on the display section 7.

Therefore, when the upward scroll key "↑" is operated, the graph display is scrolled upward by n screens - degrees.

■ Operation of the down scroll key "↓" Also, range data "X□, = 300.X, ,,, = 2
00, Y, □=100. If the down scroll key "↓" is operated in the state of Y, l, . . . =OJ, YES is determined in step S4, and the process proceeds to step S8.

In step S8, similarly to step S5, it is determined whether or not the number has been entered, that is, whether numerical data has been input to the input buffer 3. If the down scroll key "↓" is operated without inputting numerical data, the answer is NO and the process proceeds to step S9. In step S9, "1" is set in the n register.
is written, and the process advances to step S10.

For example, if the numerical data "2" is input and the down scroll key "↓" is operated, the numerical data "2" stored in the power buffer 3 is written to the n register, and the process proceeds to step 8.10. .

In step S10, the calculation of 'Y wax n A J and the calculation of 'Y min -n A J are executed. That is, if n=2, the range data Yminr
n (=2) times the data Ar10OJ is subtracted from "lOO", and the range data YY,X becomes r-100J.

Also, range data Y1. . Data Art00 to rOJ
N (=2) times J is subtracted, and range data Y m
I, l becomes r-200J. From step S7, the process advances to step S18.

In step S18, similar to the above, new range data rX,,,=300,X,In=20
A graph is displayed on the display section 7 in the range of 0, Y--x''-100, Y-+-=-200J.

Therefore, when the down scroll key "↓" is operated, the graph display is scrolled downward by 0 screens, - degrees.

■ Operation of the left scroll key "←" Also, the range data "X□, = 300.
=200,Y,,=300. If the left scroll key "←" is operated in a state where Y, i, 1 = 200J, it is determined NO in step S3 and the process proceeds to step 811.

In step Sll, the operated scroll key 1
It is determined whether c is the left scroll key "←". In this case, the determination is YES and the process proceeds to step S12.

In step SL2, as in step S5, it is determined whether the numerical data has been inputted or not, that is, whether numerical data has been input to the power buffer 3. If the left scroll key "←" is operated without inputting numerical data, the answer is NO and the process proceeds to step S13.

In step S13, "1" is written to the n register,
Proceed to step S14.

Further, for example, when the numerical data "2" is input and the left scroll key "←" is operated, the numerical data "2" stored in the power buffer 3 is written to the n register, and the process proceeds to step S14.

In step S14, 'X w+ax -n B J
and 'X win n B J' are executed. That is, if n=2, the range data X,...
, r300'' is subtracted by n (=2) times the data BrtOOJ, resulting in range data X□. becomes rloOJ.

Further, n (=2) times the data Br1oOJ is subtracted from the range data X, , lfi "200", and the range data X m + n becomes "0". From step S7, the process advances to step S18.

In step S18, as described above, new range data rX, , x=100. X,,1. =0゜Y-
A graph is displayed on the display unit 7 in the range of 300 J and Y-+-=200 J.

Therefore, when the left scroll key "←" is operated, the graph display is scrolled to the left by 0 screens, - degrees.

■ Operation of right scroll key "→" Also, range data r-X,, x= 300, X-+
n=200, Y,,,=300. Yffi, □= ,2
If the right scroll key "→" is operated in the state of 00 J, it is determined No in step S3 and the process proceeds to step Sl.
The process proceeds to step S15, and the determination in step Sll is also negative, and the process proceeds to step S15.

In step S15, similarly to step S5, it is determined whether the number has been entered or not, that is, whether numerical data has been input to the input cover sofa 3. If the right scroll key "→" is operated without inputting numerical data, the determination is NO and the process proceeds to step 816. In step 81B, "1" is written in the n register, and the process advances to step S17.

For example, if the numerical data "2" is input and the right scroll key "→" is operated, the numerical data "2" stored in the power buffer 3 is written to the n register, and the process proceeds to step S17.

In step S17, 'X wax + n B J
and rXmin+nBJ are executed.

That is, if n=2, range data X. , r300"
n (=2) times the data Br1OOJ is added to the range data X□8, and the range data X□8 becomes r500J.

Further, n (=2) times the data Br1oOJ is added to the range data XIIIfl "200", and the range data X + s + n becomes r400J. Step S7
From there, the process advances to step S18.

In step S18, similarly to the above, new range data "X□,=500.X,l□=400,Y, .
,=300. A graph is displayed on the display section 7 in the range of Ymin=200J.

Therefore, when the right scroll key "→" is operated, the graph display is scrolled to the right by n screen points - degrees.

[Effects of the Invention] As described in detail above, according to the present invention, it is possible to provide a small electronic calculator with a graph display function that allows a user to quickly view a desired portion of a graph through simple operations.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing the circuit configuration, and FIG. 2 is a flow chart showing the operation. DESCRIPTION OF SYMBOLS 1... Key manual part, 2... Control part, 3... Power buffer, 4... RAM15... Arithmetic part, 6... Display buffer huff... Display part.

Claims (1)

[Claims] In a small electronic calculator with a graph display function that calculates y by varying x with respect to the functional formula y=f(x) and displays a graph by plotting (x, y), range data (X_m_i_n, X_m_a_x, Y_
m_i_n, Y_m_a_x), a horizontal scroll key for instructing horizontal scrolling of the display screen, and by operating this horizontal scroll key, (X
_m_a_x - X_m_i_n) The integral multiple of the calculation result is used as range data X_m_i_n, X_m_a
An X range addition means that adds each to
Y-range adding means adds an integer multiple of the calculation result of _n) to range data Y_m_i_n and Y_m_a_x, respectively;
n, X_m_a_x, Y_m_i_n, Y_m_a_x
) A small-sized electronic calculator with a graph display function, characterized in that it is equipped with a graph creation means for creating a graph of the functional formula y=f(x) based on the equation y=f(x).