Abstract: An image display device includes a display unit, a graph display control unit, a display range displacement unit, a plotted point change unit and a graph update control unit. The graph display control unit displays an approximate graph for plotted points on an image display region to which a coordinate system is set. The display range displacement unit displaces a display range of the coordinate system with an image in the image display region fixed. Responding to the display range being displaced, the plotted point change unit changes coordinate values of the plotted points in accordance with displacements of the display range to maintain positions of the plotted points before and after the display range being displaced, and updates display of the plotted points, and the graph update control unit updates a content displayed by the graph display control unit.

Abstract: An image display terminal includes an image display control unit, a display range setting unit, a display range sending unit and a graph expression receiving unit. The image display control unit displays a background image in a display screen. The display range setting unit sets display range data of a coordinate system to an image display region of the display screen. The display range sending unit sends the display range data to at least one other image display terminal which displays the background image displayed on the image display terminal. After the display range data is set to an image display region of the other image display terminal, the graph expression receiving unit receives, from the other image display terminal, graph expression data for a graph figure displayed on the image display region of the other image display terminal.

Abstract: Provided is a learning support device that supports a user to solve a problem for which an explanation is not stored by referring to an explanation stored for another problem. A student terminal includes a storage unit in which example problems each including a problem and an explanation and exercises are stored; an input unit which designates any one of the exercises as a designated exercise based on a user's operation; a CPU which detects, from the example problems stored in the storage unit, an example problem having a problem similar to the designated exercise as a reference example problem; and a display unit which displays an explanation for the reference example problem and displays a portion in the explanation that corresponds to a difference portion between the problem of the reference example problem and the designated exercise in a discriminative manner.

Abstract: A scientific electronic calculator includes a display unit which performs display by a plurality of dots and a CPU which displays X and Y axes on the display unit and displays scales on the X axis at predetermined scale intervals. The CPU displays a graph in a coordinate system determined by the X and Y axes moves the trace pointer on the graph dot by dot in an X-axis direction according to a user operation, and displays coordinate values of the trace pointer on the display unit, while displaying a trace pointer on the graph The CPU sets a numerical width of the X axis in such a way that a value obtained by dividing the numerical width of the X axis by a scale interval is one N-th of the number of dots in an X-axis direction, the N which is an integer, and displays the X axis.

Abstract: A graph arbitrarily input by the user is displayed on a dot-matrix display screen. When an instruction to determine any one of the characteristic points, such as intersections, local maxima, or local minima, is given, an characteristic point to be determined is calculated and the result is pointed by pointer P and, at the same time, the coordinates (X, Y) of the characteristic point are displayed. Depending on whether there is one other graph which overlaps or makes contact with the characteristic point of the graph and displayed dots of the graph near the characteristic point, it is determined whether a locus of the graph near the characteristic point is displayed unclearly. If the condition for unclear display has been satisfied, the graph including the characteristic point is enlarged repeatedly at the enlargement factor set by the user until the condition for unclear display is not fulfilled.

Abstract: Provided is a learning support device that supports a user to solve a problem for which an explanation is not stored by referring to an explanation stored for another problem. A student terminal includes a storage unit in which example problems each including a problem and an explanation and exercises are stored; an input unit which designates any one of the exercises as a designated exercise based on a user's operation; a CPU which detects, from the example problems stored in the storage unit, an example problem having a problem similar to the designated exercise as a reference example problem; and a display unit which displays an explanation for the reference example problem and displays a portion in the explanation that corresponds to a difference portion between the problem of the reference example problem and the designated exercise in a discriminative manner.

Abstract: An image display device includes a display unit, a graph display control unit, a display range displacement unit, a plotted point change unit and a graph update control unit. The graph display control unit displays an approximate graph for plotted points on an image display region to which a coordinate system is set. The display range displacement unit displaces a display range of the coordinate system with an image in the image display region fixed. Responding to the display range being displaced, the plotted point change unit changes coordinate values of the plotted points in accordance with displacements of the display range to maintain positions of the plotted points before and after the display range being displaced, and updates display of the plotted points, and the graph update control unit updates a content displayed by the graph display control unit.

Abstract: An image display terminal includes an image display control unit, a display range setting unit, a display range sending unit and a graph expression receiving unit. The image display control unit displays a background image in a display screen. The display range setting unit sets display range data of a coordinate system to an image display region of the display screen. The display range sending unit sends the display range data to at least one other image display terminal which displays the background image displayed on the image display terminal. After the display range data is set to an image display region of the other image display terminal, the graph expression receiving unit receives, from the other image display terminal, graph expression data for a graph figure displayed on the image display region of the other image display terminal.

Abstract: A graphing calculation apparatus comprises a mode setting unit which sets one of a manual mode and an automatic mode based on an instruction made by a user. A key data input unit inputs key data entered by the user. The input key data is stored in a key data storing unit in association with the set mode. Calculation of a function is performed based on the stored key data, and a guide display unit displays the stored key-data as guide data. For displaying the key data associated with the manual mode, when the key data corresponding to the guide data is input, subsequent key data is displayed as guide data. For displaying the key data associated with the automatic mode, the guide data is automatically input in succession and subsequent key data is sequentially displayed as guide data.

Abstract: There is provided a graph display apparatus. An image display control unit causes a display unit to display the image data stored by the image and graph formula storage unit. An formula input unit inputs a graph formula according to a user operation. An input graph display control unit causes the display unit to display a graph corresponding to a graph formula input by the formula input unit, on the image data displayed on the display unit by the image display control unit as a background image. A model graph display control unit causes the display unit to display, in a different display mode, a graph corresponding to a model graph formula stored by the image and graph formula storage unit, together with the graph displayed on the image data as the background image on the display unit by the input graph display control unit, according to a user operation.

Abstract: There is provided a graph display apparatus. An image display control unit causes a display unit to display the image data stored by the image and graph formula storage unit. An formula input unit inputs a graph formula according to a user operation. An input graph display control unit causes the display unit to display a graph corresponding to a graph formula input by the formula input unit, on the image data displayed on the display unit by the image display control unit as a background image. A model graph display control unit causes the display unit to display, in a different display mode, a graph corresponding to a model graph formula stored by the image and graph formula storage unit, together with the graph displayed on the image data as the background image on the display unit by the input graph display control unit, according to a user operation.

Abstract: A scientific electronic calculator includes a display unit which performs display by a plurality of dots and a CPU which displays X and Y axes on the display unit and displays scales on the X axis at predetermined scale intervals. The CPU displays a graph in a coordinate system determined by the X and Y axes moves the trace pointer on the graph dot by dot in an X-axis direction according to a user operation, and displays coordinate values of the trace pointer on the display unit, while displaying a trace pointer on the graph The CPU sets a numerical width of the X axis in such a way that a value obtained by dividing the numerical width of the X axis by a scale interval is one N-th of the number of dots in an X-axis direction, the N which is an integer, and displays the X axis.

Abstract: A graph arbitrarily input by the user is displayed on a dot-matrix display screen. When an instruction to determine any one of the characteristic points, such as intersections, local maxima, or local minima, is given, an characteristic point to be determined is calculated and the result is pointed by pointer P and, at the same time, the coordinates (X, Y) of the characteristic point are displayed. Depending on whether there is one other graph which overlaps or makes contact with the characteristic point of the graph and displayed dots of the graph near the characteristic point, it is determined whether a locus of the graph near the characteristic point is displayed unclearly. If the condition for unclear display has been satisfied, the graph including the characteristic point is enlarged repeatedly at the enlargement factor set by the user until the condition for unclear display is not fulfilled.

Abstract: A graphing calculation apparatus comprises a mode setting unit which sets one of a manual mode and an automatic mode based on an instruction made by a user. A key data input unit inputs key data entered by the user. The input key data is stored in a key data storing unit in association with the set mode. Calculation of a function is performed based on the stored key data, and a guide display unit displays the stored key-data as guide data. For displaying the key data associated with the manual mode, when the key data corresponding to the guide data is input, subsequent key data is displayed as guide data. For displaying the key data associated with the automatic mode, the guide data is automatically input in succession and subsequent key data is sequentially displayed as guide data.

Abstract: A calculation data display device includes a display which displays input calculation data in colors. When specified calculation data is input, the calculation data display device displays the calculation data input after the specified calculation data in a color different from a regular color. The calculation data displayed in the different color is operated as calculation data belonging to the specified calculation data. First, when the specified calculation data is input in the calculation data inputting process, the calculation data input after the specified calculation data is displayed in a color different from the regular one until the user inputs releasing data. When the input calculation data is operated, the data displayed in the color different from the regular one is operated as the data belonging to the specified data input immediately before the data displayed in the different color.

Abstract: An electronic calculating apparatus for use with an overhead projector and a projection screen includes an electronic calculator and a display device. The electronic calculator comprises a data input unit and a data sending unit. The electronic calculator performs an operation corresponding to data inputted from the data input unit, and displays a result of the performed operation. The display device comprises a liquid crystal display unit of a transparent type and a data receiving unit for receiving data sent from the sending unit of the electronic calculator. The display device is placed on the top of the overhead projector, and, upon receipt of the data sent from the data sending unit of the electronic calculator, the display device performs an operation that is substantially the same as the operation performed by the electronic calculator, and displays the result of the performed operation on the liquid crystal display unit of a transparent type.

Abstract: A graph display apparatus includes a plurality of functional formulas to be displayed as graphs and their coordinate ranges are stored in a memory by operating numeric .multidot. symbol keys on a key input unit. The plurality of stored formulas are displayed on a display unit by operating a "list" key. When a plurality of arbitrary formulas are designated and a "synthesis" key is operated, the graphs of the designated formulas are calculated and displayed on a single coordinate system in accordance with coordinate ranges of the formula which is designated first. When the plurality of arbitrary formulas are designated and a "division" key is operated, the functional formulas are displayed on different coordinate systems in accordance with corresponding coordinate ranges. When the graphs of a plurality of input formulas are calculated and displayed, the individual graphs can be appropriately synthesized or divided and can be displayed in comparison with each other.

Abstract: A toy racing set includes an endless track and a remote-controlled self-propelled wireless racing toy adapted to travel around the track in a predetermined direction. The track includes a number of curved and straight sections connected to one another in such a manner as to establish a desired closed-loop race course. The straight sections of the track have a plurality of linear grooves extending generally parallel to the travel direction of the racing toy. The curved sections have a plurality of discontinuous turning grooves which are oriented at an angle from an outside portion of the curved section towards an inside portion of the curved section with respect to the predetermined travel direction of the racing toy as the racing toy enters the curved section from an adjacent straight section. The racing toy is of the single-channel variety (i.e.