JPH0737151Y2 - Small electronic calculator - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a small electronic computer capable of displaying a graph.

[Prior Art Problem] Recently, a small electronic calculator capable of displaying a graph has been put into practical use as a small electronic calculator.

Although such a small-sized computer can display a graph of the formula displayed by y = f (X), it cannot display a special output such as cash flow of financial calculation.

[Object of the Invention] The present invention has been made in view of the above circumstances, and an object thereof is to provide a small-sized electronic computer capable of displaying special data as a graph.

[Points of Invention] This invention, when displaying the data stored in the storage unit as a graph, graphs the data according to the size of these data, and if there is the same continuous data, the data is stored. It is designed to be displayed as one graph that can be distinguished from the others.

[Embodiment of the Invention] An embodiment in which the present invention is applied to a small electronic computer for performing investment evaluation calculation will be described below with reference to the drawings.

FIG. 1 shows the circuit configuration of the embodiment. In the figure, reference numeral 1 denotes a key input section, which is a "DCF" key 1a for setting an investment evaluation mode, a "CF" key 1b for writing and reading CF data, and a "CFF" key for repeatedly setting the number of times of CF data. It has an "N" key 1c, a "Graph" key 1d for creating a graph, and a "Trace" key 1e for setting a trace display. In this case, the key input unit 1 also has a numerical key (not shown).

The key input data of the key input unit 1 is given to the key determination unit 2. The key determination unit 2 determines the input data, gives execution data to the control unit 3, and gives numbers, character data, etc. to the display buffer 4.

The control unit 3 is composed of a ROM and stores a program for controlling each circuit in advance. In this case, the control unit 3
Is a display buffer 4, CF data memory 5, R / W control unit 6,
A control command is given to the calculation unit 7, the graph creation unit 8, and the display control unit 9. Further, the control unit 3 has a j counter 31 that counts the number of times of reading CF data.

The display buffer 4 receives the numerical data and the character data from the key input unit 1 to the CF data memory 5 and the display control unit 9 and the read data from the CF data memory 5. The CF data memory 5 is a CF input from the key input unit 1.
Store data. FIG. 5 shows a concrete example of the CF data memory 5, which has a number storage area 51 for storing the number part of the CF data and a number storage area 52 for storing the number of times of storage, and stores such CF data. CF0 to CF29 can be stored. The R / W control unit 6 controls writing and reading of data in the CF data memory 5. In this case, R /
The W control unit 6 has an n counter 61 that counts the number of times of writing CF data. The calculation unit 7 is a program memory 10
The calculation of the above-described formula is executed while exchanging data with the CF data memory 5 on the basis of the program necessary for obtaining the internal rate of return of the investment evaluation stored in, and the result is given to the control unit 3. In addition, the calculation unit 7 performs a calculation for cash flow creation based on the data in the CF data memory 5, and the result is shown in the graph creation unit 8 and the graph.
RAM11 is also given. The graph creating unit 8 takes in an arrow pattern or a bar-shaped pattern from the graph pattern memory 12 based on the calculation result of the calculating unit 7, creates the data necessary for creating the graph, and supplies this data to the graph RAM 11. The graph RAM 11 corresponds to a dot matrix of the display unit 13 to be described later, and the display contents based on the data given from the arithmetic unit 7 and the graph creating unit 8 are stored as "1" and "0". The stored contents of the graph RAM 11 are given to the display controller 9. This display control unit 9
Is for driving the display unit 13. As the display unit 13 here, a 96 × 64 dot liquid crystal display unit (LCD) is used.

Next, the operation of the embodiment thus configured will be described.

Now, when you operate the "DCF" key 1a in the key input section 1,
The investment evaluation mode is set and the flowchart shown in FIG. 2 is executed. First, investment evaluation (DCF) in step A1
Depending on the mode setting, the content n of the n counter 61 of the R / W controller 6
Is set to "0".

From this state, the CF data for obtaining the investment evaluation is input. First, the numeric key is operated to input the numeric data. Then, step A2 is YES, so step A3
Input the numerical value with and return to step A2.

Next, when the "CF" key 1b is operated, NO is determined in step A2, YES is determined in step A4, and the process proceeds to step A5. Step A5
Then, the content n of the n counter 61 of the R / W control unit 6 is incremented by one.
Then, the procedure proceeds to step A6, where the CF data register part is written in the register data storage area 51 of the CF data memory 5, and step A7
Then, "1" is written in the number-of-times storage area 52 of the CF data memory 5, and the process returns to step A2.

In the same way, if you input the numerical data with the numerical keys and then operate the "CF" key 1b, step A1 ~ step
The operation of A7 is repeated and the CF data is written in the CF data memory 5.

By the way, if the CF data are the same continuously,
After inputting the numerical data with the F key, the number of consecutive times is counted, and then the N key 1c is operated. Then, the number of times is set in step A2 and step A3, and step A8
Then, the processing proceeds to step A9 where YES is reached and the count data is written in the count storage area 52 of the CF data memory 5.

In this way, the CF data memory 5 in which the CF data is written has a content as shown in FIG. 5 as an example. In this case CF
Data is stored from CF0 to CF6, of which CF0 and CF1 are withdrawal data for investments, etc., and are stored by adding a “−” sign in front of the numerical data and the remaining CF2 to CF6 such as profits. Deposit data is written. In addition, it is shown that the same number data is consecutive "2" times in CF3.

After the CF data has been input, use the key input section 1 to select "Gr
When the "aph" key 1d is operated, YES is determined in the step A10 and the process proceeds to the step A11 to create a graph. Here, if the "Graph" key 1g is not operated, the process proceeds to another process.

The flowchart shown in FIG. 3 is executed to create the graph in step A11. First, in step B1, the interval of the x-axis of the graph is calculated by the content n of the n counter 61 of the R / W control unit 6. In this case, the content n of the n counter 61 is "6" as described above, so the x axis is divided into 6 and the scale data is written in the graph RAM 11.

Next, in step B2, it is determined whether or not n ≧ 15 in consideration of the restriction of the display range on the display unit 13. In the above case, n = 6
Is NO, so go to Step B3 and select the graph pattern memory.
The arrow pattern is read from 12. Then, the process proceeds to step B4.

At step B4, the content j of the j counter 31 of the control unit 3 is set to "0". Then, in step B5, the CF data memory 5
CF data CFj stored in
Read CF data. Then, in step B6, the numerical data value of the CF data CFj read from the CF data memory 5 and C
Largest CF among CF data written in F data memory 5
Calculate the length of the arrow bar from the ratio with the data CFmax value,
The result is written in the graph RAM 11 as graph data. Then, in step B7, it is determined whether the number of times CF data CFj, that is, the number of times CF data CF0 number storage area 52 shown in FIG. 5 is "1". Here, YES, so step B
Proceeding to 8, the contents of the graph RAM 11 are given to the display control unit 9 and displayed on the display unit 13. In this case, C of CF0 in Fig. 5
As for F data, since a "-" sign is attached in front of the numerical data, it is displayed as an arrow of a predetermined downward length on the scale at the left end of the x axis as shown in FIG. 6a. .

Then, in step B9, n <j is judged, but here NO
Therefore, the J counter 31 of the control unit 3 is incremented by 1 in step B10.
Then, the procedure returns to step B5.

Then, this time, in step B5, the CF data of CF1 in the CF data memory 5 shown in FIG. 5 is read. And step B6
Although the operation proceeds to the subsequent steps, in this case as well, the CF data is preceded by the "-" sign before the numerical data and the number of times in the number storage area 52 is "1". Therefore, as shown in FIG. 2 from the left end
Displayed as an arrow with a predetermined downward length on the second scale
Displayed at 13.

Next, NO in step B9, the J counter 31 of the control unit 3 is incremented by 1 in step B10, and the process returns to step B5.
Then, the CF data of CF2 in the CF data memory 5 shown in FIG. 5 is read out, and the operation proceeds to step B6 and thereafter. In this case, the CF data has no "-" sign in front of the numerical data, and the number of times in the number storage area 52 is "1". Therefore, as shown in FIG. It is displayed on the display unit 13 as an arrow of a predetermined upward length on the scale.

Next, in step B9, NO again, in step B10, the J counter 31 of the control unit 3 is incremented by 1, and when returning to step B5, the CF data of CF3 in the CF data memory 5 shown in FIG. Proceed to the operation after step B6. CF in this case
The data has no "-" sign before the number data, but the number of times in the number storage area 52 is "2". Then, the answer is NO in step B7, and the process proceeds to step B11 to pattern the number of times. In this case, since the number of times in the number storage area 52 is "2", two dot display data are written in the graph RAM 11 as the number of times patterning data. Next, in step B8, the contents of the graph RAM 11 are given to the display control unit 9 and displayed on the display unit 13. In this case, the CF data is 4 from the left end of the x axis as shown in d of FIG.
It is displayed as an upward arrow of a predetermined length on the second scale, and two dots e are displayed below this arrow.

Hereinafter, the operations of steps B5 to B10 are repeated for the CF data up to CF6 in the CF data memory 5 shown in FIG. 5, and as shown in FIG.
Displayed at 13. Then, if YES in step B9,
The process returns to the flowchart of FIG.

In FIG. 2, the process proceeds to step A12, and it is determined whether or not the "Trace" key 1e is operated. In this case, if there is no key operation and the result is NO, the process ends. On the other hand, if there is a key operation and the answer is YES, the process proceeds to step A13, and the trace is executed.

For the trace in step A13, the flowchart shown in FIG. 4 is executed. First, in step C1, the content j of the j counter 31 of the control unit 3 is set to "0". Then step C2
At this time, the CF data CFj stored in the CF data memory 5, here the CF data of CF0 shown in FIG. 5 is read. Then, in step C3, as shown in FIG. 7, the value of the CF data of CF0 is displayed on the display unit 13 and, at the same time, the tip of the arrow graph a representing the CF data is blinked.

If the "CF" key 1b in the key input unit 1 is operated from this state, YES is determined in step C4 and the process proceeds to step C5.
In this case, if there is no key operation, the state of step C4 is maintained. In step C5, the J counter 31 of the control unit 3 is set to +
Do 1 Then, at step C6, n <j is judged, but since NO here, it returns to step C2 and this time, the CF data of CF1 of the CF data memory 5 shown in FIG. 5 is read. Then, the operation proceeds to step C3 and thereafter, and the value of the CF data of CF1 is displayed on the display unit 13, and at the same time, the tip of the arrow graph representing the CF data is blinked.

Hereinafter, every time the "CF" key 1b is operated, the CF data up to CF6 in the CF data memory 5 shown in FIG. 5 is read out in order, and the operation of steps C1 to C6 causes the display unit 13 to display the respective CF data.
The CF data value is displayed, and at the same time, the tip of the arrow graph representing each CF data is blinked. After that, if YES in step B9, the process returns to step C1, the content j of the j counter 31 of the control unit 3 is set to “0” again, and the CF data value of CF1 in the CF data memory 5 is displayed on the display unit 13. At the same time, the tip of the arrow graph representing the CF data is blinked.

In the above description, the case where the CF data is written in CF0 to CF6 of the CF data memory 5 and the number n of CF data is smaller than 15 is described. However, when n is larger than 15, in FIG.
If NO in step B2, the flow proceeds to step B12, the bar pattern is read from the graph pattern memory 12, and the graph of each CF data is displayed using this pattern as shown in FIG.

Therefore, if done in this way, graphed data corresponding to the size of each CF data will be created for each CF data input during the investment valuation calculation, and the same continuous data will be distinguished from other data and displayed as cash flow. Since it can be displayed in the section, in the conventional investment evaluation calculation, if you want to recognize the cash flow by graphing the positive / negative relationship of CF data, the difference in the size of CF data, the number of data, etc. Compared with the one that had to draw a graph on paper etc. while calling each one, it is possible to eliminate such troublesome and time-consuming work at all,
Usability is dramatically improved because it does not require techniques for drawing. Moreover, since the state of the CF data can be visually grasped, it is possible to easily confirm the correctness of the data, and it is also very useful for the simulation of the investment evaluation calculation.

The present invention is not limited to the above-described embodiments, and can be modified and implemented as appropriate without departing from the scope of the invention. For example, although the dot display is used as a means for displaying the number of times of CF data in the above-mentioned embodiment, the thickness of the bar portion of the arrow representing CF data may be changed according to the number of times.

[Advantages of the Invention] The present invention graphs each data stored in the storage unit according to the size of the data, and displays the same continuous data as one graph distinguished from other data. Therefore, there is an advantage that the data in the storage means can be visually grasped and the correctness / incorrectness confirmation of the data input can be easily performed. Further, it can be greatly useful for the simulation at the time of calculation.

[Brief description of drawings]

FIG. 1 is a block diagram showing a circuit configuration of an embodiment of the present invention, FIGS. 2 to 4 are flow charts for explaining the operation of the embodiment, and FIG. 5 is a CF data used in the embodiment. FIG. 6 is a block diagram of the memory, and FIG. 6 to FIG. 8 are views for explaining the relationship between display examples on the display unit of the embodiment. 1 ... Key input section, 1a ... "DCF" key, 1b ... "CF" key, 1
c ... "N" key, 1d ... "Graph" key, 1e ... "Trace" key, 3 ... control section, 4 ... display buffer, 5 ... CF data memory, 7 ... calculation section, 8 ... graph creation section, 10 ... Program memory, 11 ... Graph RAM, 12 ... Graph pattern memory, 13
... Display.

Claims (1)

[Scope of utility model registration request] 1. A display means having a display screen of an XY coordinate system, a storage means for storing a plurality of numerical data, a graph for displaying the numerical data stored in the storage means on the display means. And a display control means for displaying consecutive numerical data of the same value stored in the storage means as one graph in distinction from the graph display of other data. .