JPH07334146A - Graph display system - Google Patents

Abstract

PURPOSE:To obtain the graph display system which can automatically set a proper display range of input data by determining the display range of the input data on the basis of a calculated mean value and a standard deviation and displaying the input data with the determined display range. CONSTITUTION:A statistic calculation part 2 calculates specific statistics, e.g. the mean value and standard deviation as to the input data from an input data part 1. A display range determination part 3 determines the display range on the basis of the statistics calculated by the statistic calculation part 2 and displays the input data at a display part 4 with the determined display range. Namely, the display range determination part 3 determines the display range on the basis of {(mean value)-(standard deviationX2)}-{(mean value) +(standard deviation)X2)} from the mean value and standard deviation obtained by the statistic calculation part and outputs the display range to the display part 4 range. Consequently, when data having uniform or nonuniform density are graphed, there is no omission of important in put data and data in the proper range are automatically displayed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a graph display system,
In particular, the present invention relates to a graph display method in which the display range is automatically set optimally and displayed in a graph.

[0002]

2. Description of the Related Art For example, when displaying a graph of measurement data or calculated data such as a graph of spectrum data showing frequency on the horizontal axis and power level on the vertical axis, it is important to set the display range appropriately. Data cannot be displayed clearly.

Conventionally, the setting of the display range when displaying data in the form of a graph has been performed by a user manual setting method or an automatic setting method.

In the manual setting method, as shown in FIG. 5, when the user inputs the display range using the display range input unit 6,
The display range determination unit 3 determines the display range. Input data such as measurement data and calculation data from the input data section 1 is
The display unit 4 displays a graph based on the display range determined by the display range determination unit 3. Such a manual setting method has a problem that the user has to input the display range each time in response to a change in the input data, and therefore a method of automatically setting the display range has been put into practical use. In the automatic setting method, as shown in FIG. 6, the maximum / minimum value calculation unit 7 calculates the maximum value and the minimum value of the input data based on the input data obtained from the input data unit 1,
The display range determination unit 3 determines the display range so that the range from the minimum value to the maximum value can be displayed as a graph, and the display unit 4
Is displayed.

[0005]

The conventional display system as described above has the following problems. In the manual setting method as shown in FIG. 5, the display range must be set again each time the input data fluctuates, resulting in poor operability. Further, in the method of setting the display range from the maximum value and the minimum value detected from the input data, such as the automatic setting method as shown in FIG. The data is concentrated in a narrow area on the graph, making it difficult to see the graph.

For example, in the logarithmic display graph, if even one point of data 0 exists, it becomes minus infinity on the graph. Even if you use a very large negative number instead of minus infinity, trying to display the full range of data will concentrate most of the other data in a narrow range on the graph, and It will be difficult to distinguish each individual. As an example, FIG. 7 shows an example of a display graph in which the display range is set by the automatic setting method shown in FIG. In FIG. 7, data # 1 far from other data
Since the display range is expanded in the vertical axis direction by # and # 2, the range A is compressed even though it is originally desired to display subtle data fluctuations in the range A, and the original purpose is achieved. I can't.

Therefore, an object of the present invention is to provide a graph display system capable of automatically setting an appropriate display range of input data.

[0008]

In order to solve the above-mentioned problems, the graph display method of the present invention calculates an average value and standard deviation of input data, and inputs the input value based on the calculated average value and standard deviation. It is configured to determine a display range of data and display the input data in the determined display range. Further, a graph display method according to another aspect of the present invention performs a predetermined weighting operation on input data, calculates an average value and a standard deviation of the weighted input data, and based on the calculated average value and standard deviation. Is configured to determine the display range of the input data and display the input data in the determined display range. The weighting calculation is 1 / exp (x) for the x-axis data x.
Can be performed by a predetermined density correction function such as

[0009]

According to the present invention, the display range of the input data is determined and displayed based on the average value and the standard deviation calculated for the input data. It is also possible to perform a predetermined weighting calculation on the input data and determine the display range based on the average value and standard deviation calculated for the weighted input data. The weighting calculation can be performed on the X-axis data x by a predetermined density correction function such as 1 / exp (x).

[0010]

Embodiments of the present invention will now be described with reference to the drawings. FIG. 1 is a configuration block diagram showing an embodiment of a graph display system according to the present invention.

The statistic calculation unit 2 calculates a predetermined statistic, such as an average value and a standard deviation, for the input data from the input data unit 1. The display range determination unit 3 determines the display range based on the statistic calculated by the statistic calculation unit 2,
The input data is displayed on the display unit 4 within the determined display range. The specific configuration will be described below.

The display range deciding section 3 defines the display range from the average value and the standard deviation obtained by the statistic calculating section from {(average value)-(standard deviation x 2)} to {(average value) +
(Standard deviation × 2)} and output to the display unit 4 to set the display range.

FIG. 2 shows a display example of the input range shown in FIG. 7 according to the display range set by the embodiment shown in FIG. In the display of FIG. 2, as compared with FIG. 7, all the data is not displayed, but most of the data is included in the display range, the data change in the range A of FIG. 7 is clearly displayed, and the characteristics of the data are visually recognized. Will be easier.

FIG. 3 is a block diagram showing the configuration of another embodiment of the graph display system according to the present invention. In this embodiment, the weighting calculator 5 performs a predetermined weighting process on the input data, and then the statistic calculator 2 calculates the statistic. For example, when there is input data as shown in FIG. 4 (X points indicate data points), since the input data is concentrated in the low level range, the average value according to the embodiment shown in FIG. In setting the display range based on the range B of FIG.
Only the data of the part is displayed, and the features of the entire input data cannot be displayed. Therefore, in this embodiment,
In order to solve this problem, the input data is weighted.

The weighting calculator 5 performs density correction on the input data using a density correction function. The statistic calculation unit 2 calculates a weighted average value and standard deviation, and outputs the weighted average value and standard deviation to the display range determination unit 3. The display range determination unit 3 sets the display range to {(average value)-(standard deviation x 2)} to {(average value) + based on the average value and standard deviation of the weighted input data.
(Standard deviation × 2)} and send it to the display unit 4 to display the input data in the determined display range. A graph display example of the input data in the display range determined as described above is shown in FIG. 4, and substantially the entire range of the region of interest is displayed even if the input data has a bias in density.

As an example, when the input data indicates the amplitude level with respect to the frequency arranged at equal intervals, the frequency is represented by the X axis,
A case of displaying a logarithmic graph with the amplitude level on the Y axis will be described.

The X-axis values of the individual data points of the input data whose total amount of input data is N and whose amplitude of the x-th frequency is d (x) (x is 0 to N-1) are x-axis and Y-axis. Value d
In the case of (x), the data in the Y and X axis directions are not a uniform distribution on the graph, and the density increases as x increases as shown in FIG. If the display range is determined by calculating the average value and the standard deviation without performing the density correction, the display range is only the dotted line portion in FIG. 4, as described above. Therefore,
For each data, for example, 1 / exp as a density correction function
(X) is weighted, and the average and standard deviation of the weighted input data are calculated based on the formula shown in FIG.

Based on the statistics obtained in this way, the display range of the Y axis is changed from (average value + standard deviation × 2) to (average value−
After making the standard deviation x 2), display the original data as a graph.

In the above embodiment, the display range is
From (mean value + standard deviation x 2) to (mean value-standard deviation x)
An arbitrary range other than 2) can be set, and a function other than 1 / exp (x) can be arbitrarily selected as the density correction function according to the application. It is also possible to put a scale (scale) and perform scaling if necessary.

[0020]

As described above, according to the graph display method of the present invention, when displaying data having uniform or non-uniform density in a graph, important input data is not missing and data in an appropriate range is displayed. It becomes possible to display automatically, and the operability and the visibility of data characteristics are improved.

[Brief description of drawings]

FIG. 1 is a configuration block diagram showing an embodiment of a graph display system according to the present invention.

FIG. 2 is a diagram showing a display example of input data in a display range set by the embodiment shown in FIG.

FIG. 3 is a configuration block diagram of another embodiment of the graph display system according to the present invention.

FIG. 4 is a diagram showing a graph display example of input data in a display range determined in the embodiment shown in FIG.

FIG. 5 is a diagram for explaining a conventional graph display method based on a manual setting method.

FIG. 6 is a diagram for explaining a graph display method by a conventional automatic setting method.

FIG. 7 is a diagram showing an example of a display graph in which a display range is set by an automatic setting method.

[Explanation of symbols]

 1 Input Data Section 2 Statistics Calculation Section 3 Display Range Determining Section 4 Display Section 5 Weighting Calculation Section 6 Display Range Input Section 7 Maximum / Minimum Value Calculation Section

Claims (3)

[Claims] 1. A mean value and standard deviation of input data are calculated, a display range of the input data is determined based on the calculated mean value and standard deviation, and the input data is displayed in the determined display range. A graph display method characterized by: 2. A predetermined weighting calculation is performed on the input data, an average value and a standard deviation of the weighted input data are calculated, and a display range of the input data is determined based on the calculated average value and standard deviation. And displaying the input data within the determined display range. 3. The graph display system according to claim 2, wherein the weighting calculation is performed by a predetermined density correction function.