JPH0697448B2 - Small electronic calculator with graph display function - Google Patents

Description

TECHNICAL FIELD OF THE INVENTION The present invention relates to a small electronic calculator having a graph display function.

[Prior art and its problems]

Conventionally, in small electronic calculators such as personal computers (personal computers) and pocket computers, BA
Some SIC programs have been created and graphs can be displayed by entering data.

However, in the above-mentioned conventional compact electronic calculator having a graph display function, it is necessary to build a program dedicated to the graph. Therefore, those who are not familiar with the program cannot easily create the graph, and those who are used to it Even then, the input operation was very troublesome.

[Object of the Invention]

The present invention has been made in view of the above points, and is capable of creating a statistical graph by a simple key operation, and a small electronic device having a graph display function capable of creating and displaying a regression graph based on the statistical graph. The purpose is to provide a formula calculator.

[Main points of the invention]

According to the present invention, as statistical data is input, the points are plotted on the immediate display unit, and then a regression graph is created and displayed based on the above data.

First Embodiment of the Invention An embodiment of the present invention will be described below with reference to the drawings. In FIG. 1, reference numeral 1 denotes a key input section, which includes a numeral key 2, a function key 3, a function key 4, a "," key 5, and a ";" key 6,
Graph key 7, Range key 8 for inputting range data, LR key 9 for specifying statistical data memory, Execute (EXE) key 10 for executing graph creation operation, DT key 11 for specifying data input, input data It has a CL key 12 for clearing and a Line 1 key 13 for instructing to display a regression graph.
The input data from the key input unit 1 is the control unit.
Sent to 20. The control unit 20 stores various control programs, gives a sampling signal to the key input unit 1, and also stores a mathematical expression storage unit 19, a calculation unit 21, and a mathematical formula buffer.
22 and gives a control command to the display buffer 23. In addition, the control unit 20 controls the operation unit 21 according to the key operation of the key input unit 1,
The arithmetic data is given to the mathematical expression buffer 22, and the address data and the read / write data are stored in the storage unit 24 configured by a RAM or the like.
Give a write command. Then, the arithmetic unit 21 is connected to the formula storage unit 19, the formula buffer 22, and the storage unit 24. The formula buffer 22 also functions as an input buffer, and temporarily stores key input data and writes a formula read from the formula storage unit 19. Further, the data output from the calculation unit 21 is sent to the display buffer 23. This display buffer 23 is a text display buffer 23.
It is composed of a and a graph display buffer 23b, is addressed by the data sent from the storage unit 24 via the address decoder 25, and the data from the arithmetic unit 21 is written to the designated address. Then, the display buffer 23 outputs the data written in the text display buffer 23a and the graph display buffer 23b to the display unit 26 for display. The display unit 26 displays this data when the number of segments in the Y-axis direction is M, for example, 96, X.
The number of segments in the axial direction is N, for example 64, and the leftmost end is the minimum value Xmin and the rightmost end is the maximum value in the X-axis direction.
Xmax, in the Y-axis direction, the bottom end is set as the minimum value Ymin and the top end is set as the maximum value Ymax. For input data (X, Y),
The coordinate position is displayed by the (x, y) data.

Then, in the storage unit 24, the statistical data memory 31, A
Memory 32, B memory 33, previous plot memory 34, current plot memory 35, range data Xmin, Xmax, Ymin, Yma
x, X-axis scale data (X-axis scale width) Xscale, Y-axis scale data (Y-axis scale width) Range memory 36 for storing range designation data such as Yscale, X-memory 37 for storing X-axis data, Y-axis data A Y memory 38, an x memory 39, and a calculation data memory 40 for storing the data are provided.

Next, the operation of the above embodiment will be described. First, the operation of plotting statistical data will be described with reference to the flowchart of FIG. First, as shown in step A1 in FIG. 2, the X-axis and Y-axis ranges and scales are set by the numerical key 2 and the Range key 8. That is, Rang
When the e key 8 is operated, the range setting item is displayed on the display unit 26, and data is input in the order of Xmin, Xmax, ... Ymax, Yscale. The above range data is sent from the control unit 20 to the storage unit 24 and written in the range memory 36. Next, the two-variable statistical data is input by using the numeric key 2 and the DT key 11. In this case, the X and Y statistical data are input as follows according to the type of regression.

Linear regression X (register) "," Y (register) "DT" Logarithmic regression "ln" X "," Y "DT" Exponential regression X ",""ln" Y "DT" Power regression "ln" X ",""Ln" Y "DT" When deleting data, the CL key 12 is operated instead of the DT key 11. And the above input data X, Y
Is sent to the formula buffer 22 and is temporarily stored therein. on the other hand,
The control unit 20 waits in step A2 until the data X and Y are input, and when the data is input, the process proceeds to step A3 to determine which of the DT key 11 and the CL key 12 has been operated,
If the DT key 11 is operated, the process proceeds to step A4.
In this step A4, the input X, Y data is input to the statistical data memory 31, and the data input count n, ΣX, ΣY,
Performs statistical calculation processing of ΣXY and ΣX. Then step
In A5 and A6, the above data X and Y are stored in X memory 37 and Y memory 3
Store at 8 respectively. Then, as shown in step A7 Is calculated to calculate the position data x in the X-axis direction and is written in the proto memory 35 this time in step A8. Then as shown in step A9 The dot position y in the Y-axis direction with respect to the data Y is calculated by
To calculate. Next, as shown in step A10, the dot position data (x, y) calculated in steps A7 and A9 is written in the graph display buffer 23b. Then, in step A11, it is plotted (point A) on the display unit 26 according to the contents of the graph display buffer 23b as shown in FIG. Thereafter, similarly, plot display is performed according to the input data X and Y.

When clearing the X and Y data stored in the statistical data memory 31, the CL key 12 is operated after inputting the corresponding data from the numerical keypad 2. When this CL key 12 is operated, the process proceeds from step A3 to step A12, and the X and Y data is deleted from the statistical data memory 31. That is,
The contents of X and Y input from n, ΣX, ΣY, ΣXY, and ΣX are deleted. Then, in steps A13 to A17, x and y data are obtained in the same manner as in steps A5 to A9, and the data (x, y) in the graph display buffer 23b is deleted (inverted) as shown in step A18. The dot (x, y) is turned off as shown in FIG.

Then, when creating a regression graph, the Line 1 key 13 is operated with the input data X and Y displayed in a plot as described above. This operation of the Line 1 key 13 is detected in step A19 following step A11 in FIG. 2, and a regression graph whose details will be described later is created in step A20. If the Line 1 key 13 is not operated, the process returns to step A2 to prepare for the next input data.

Next, the details of the regression graph creation processing in step A20 will be described with reference to the flowchart in FIG. First, as shown in step B1, the contents of the x memory 39 in the storage unit 24 are initialized, that is, set to "1". Then as shown in step B2 The coefficient B of the regression line is calculated by the calculation of and is stored in the B memory 33 in the storage unit 24 in step B3. In the step B2, the values of X and Y in the formula are the input data X and Y as they are in the case of linear regression, but the following values are used in the case of logarithmic regression, exponential regression, and power regression. Is used.

Logarithmic regression ... Logarithm of X → X value Y → Y value Exponential regression ... X → X value Logarithmic power regression ... X → X value logarithm Y → Y value logarithm As shown in step B4 The constant term A of the regression equation is obtained by the calculation of and is stored in the A memory 32 in step B5. Next, as shown in step B6, the above A and B are input to the mathematical expression storage unit 19, and the regression equation “Y = F
(X) ”is set. The regression equation, a linear regression ... Y = A + BX logarithmic regression ... Y = A + B · lnX exponential regression ... Y = A · e ^BX powers regression ... Y = A · X ^B according to the type of regression. Then, in step B7, the above regression equation “Y = F
(X) ”is input to the formula buffer 22. And as shown in step B8 By calculating the actual value X at the dot position x,
In step B9, it is stored in the X memory 37. afterwards,
In steps B10 and B11, the value of Y is obtained by the calculation of “Y = F (X)” and stored in the Y memory 38. Further in step B12, The dot position y is obtained by the calculation of. And step
At B13 and B14, the data (x, y) is input to the plot memory 35 this time and then to the graph display buffer 23b. Then, as shown in step B15, it is determined whether the data held in the x memory 39 is "1". The dot (p, q) that connects the lit dots in the current plot and the previous plot is calculated and input to the graph display buffer 23b as shown in step B17. Then, in step B18, the display unit 2 is displayed according to the contents of the graph display buffer 23b as shown in FIG. 3 (c).
Display the graph on 6. Note that FIG. 3 (c) shows a display example of linear regression. When it is determined in step B15 that the content of the memory 39 is "1", the process immediately proceeds to step B18 and the starting point position is displayed in a graph. Then, in step B19,
It is judged whether or not the content x of the x memory 39 has become equal to the total number M of dots in the X axis direction, and if not equal, step B20.
In step B21, the x, y data is written in the X ₀ , y ₀ memory, and the (x ₀ , y ₀ ) data is transferred to the previous plot memory 34 in step B21. Then, as shown in step B22, the data of "x ₀ +1" is written in the x memory 39, and step B8
Return to. Thereafter, the same operation is repeated, and a regression graph is created as shown in FIG. 3 (c) based on each data of X and Y. When the content x of the x memory 39 reaches the value of M,
The decision result in step B19 becomes Yes, and the graph creating process is ended.

Second Embodiment of the Invention Next, a second embodiment of the present invention will be described. In the process of statistics, there are times when you need to enter a frequency, so "x ₁ , y ₁ ; n ₁ DT"
Then, n ₁ data of (x ₁ , y ₁ ) is input. In this case, if each point (x, y) has a weight of n, such a frequency It is also possible to plot statistical data. FIG. 4 shows an embodiment in which it is possible to plot statistical data with frequencies. For example, the storage capacity of an address corresponding to 1 bit of the display unit 26 in the graph display buffer 23b has a 4-bit configuration and the dot The frequency is stored and the display command is not output only when the content of the address is "0000". Others are the same as those in the first embodiment shown in FIG. 1, and therefore, the same reference numerals as those in FIG. 1 are given and detailed description thereof is omitted.

Next, the operation of the second embodiment will be described with reference to the flowchart of FIG. First, in step A1 in FIG. 6, the X-axis and Y-axis ranges and scales are set in the same manner as in the first embodiment. Next, as shown in step A2, it is determined whether or not the data X, Y, m are input, and if there is data input, the process proceeds to step A3. In this step A3, it is judged which of the DT key 11 and the CL key 12 has been operated, and the DT key
If 11 is operated, as in the first embodiment, step A4
~ Perform the processing of A9. Then, y obtained in step A9
The value of is written in the current plot memory 35 in the storage unit 24 in step A21. Next, in step A22, the data m in (x, y) of the graph display buffer 23b is calculated by the calculation unit 21.
Read to. Then, as shown in step A23, the frequency data m input this time is added to the read data m, and the result of the addition is added to the graph display buffer 2 in step A24.
Write to (x, y) in 3b. When only the data X and Y are input and the frequency data m is not input, the data m in the graph display buffer 23b is incremented by "+1". Next, as shown in step A25, display processing is performed according to the contents of the graph display buffer 23b, and then the process proceeds to step A19, where it is determined whether or not the Line 1 key 13 has been operated. If the Line1 key 13 has not been operated, the procedure returns to step A2 to prepare for the next data input. If the Line1 key 13 has been operated, the procedure proceeds to step A20 to execute the regression graph creation processing shown in FIG. To do.

On the other hand, when the operation of the CL key 12 is detected in step A3, the processes of steps A12 to A17 are executed as in the first embodiment, and the value of the data y obtained in step A17 is plotted in step A26 this time. Write to memory 35. Then, as shown in step A27, the data m in (x, y) of the graph display buffer 23b is read to the arithmetic unit 21, and the frequency data m input this time is subtracted from the data m in step A28. Then, the subtraction result m is written in (x, y) of the graph display buffer 23b as shown in step A29, and the content of the graph display buffer 23b is displayed on the data display unit 26 in step A25. Thereafter, by the same process, the statistical data with frequency can be displayed in a plot.

In the second embodiment, the weight of the same data is given to the graph display buffer 23b, but all the input data are stored in the statistical data memory 31 and the weight is counted when the same data is input. Then, it may be stored.

〔The invention's effect〕

As described in detail above, according to the present invention, the preset X
Based on the axis range and the Y-axis range, a statistical calculation process is performed on the input numerical value to obtain display plot data, and then when the specific key is operated, the operation of the specific key is detected to create a regression graph. Since it was made to display,
If you input X, Y data, you can immediately plot on the display,
Therefore, the distribution status of the data can be easily recognized visually as well as input. In addition, since the regression graph can be displayed on the display part where the data is plotted by operating a specific key, it is possible to easily grasp the state of the statistical distribution such as the state of regression and the comparison between the regression graph and the actual data distribution. it can.

[Brief description of drawings]

1 to 4 show a first embodiment of the present invention. FIG. 1 is a block diagram showing a circuit configuration, FIG. 2 is a flow chart showing a plotting operation of statistical data, and FIG.
(A) to (c) are diagrams showing graph display examples, FIG. 4 is a flowchart showing details of regression graph creation processing, and FIG. 5 is a block diagram showing a circuit configuration in a second embodiment of the present invention. FIG. 6 is a flow chart showing the statistical data plot processing operation of the embodiment. 1 ... Key input part, 2 ... Numeric key, 7 ... Graph key, 8 ... Range key, 9 ... LR key, 10 ... DT key, 1
1 …… DT key, 12 …… CL key, 13 …… Line1 key, 19 ……
Formula storage unit, 20 ... Control unit, 21 ... Arithmetic unit, 22 ... Formula buffer, 23 ... Display buffer, 23a ... Text display buffer, 23b ... Graph display buffer, 24 ... Storage unit, 25 ... ... Address decoder, 26 ... Display section, 31 ... Statistical data memory, 34 ... Previous plot memory, 35 ... Current plot memory, 36 ... Range memory, 37 ... X memory, 38 ... Y memory, 40 …… Calculation data memory.

 ─────────────────────────────────────────────────── ─── Continuation of front page (56) Reference JP-A-52-116050 (JP, A) JP-A-54-51752 (JP, A) JP-A-54-98532 (JP, A)

Claims (1)

[Claims] 1. A dot matrix type display means capable of displaying a graph, a range data storage means for storing range data of a graph which can be displayed on the display means, an input means for inputting bivariate statistical data, and this input. Plotting means for plotting and displaying the two-variable statistical data input from the means on the display means, and a coefficient B and a constant term A of the regression equation based on the two-variable statistical data input from the input means by a regression graph display command.
And the regression equation Y = f including this coefficient B and the constant term A
The calculation means for determining (X), the calculation means for substituting the X value into the regression equation obtained by the calculation means to obtain the Y value, and the (X, Y value calculated by this calculation means Y) a small electronic computer having a graph display function, which is provided with a graph display unit for displaying the regression graph simultaneously with the plot display of the bivariate statistical data by plotting the coordinate points on the display unit. .