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US 5,210,708 AGranted
Compact electronic calculator equipped with graphic display function
AssigneeCasio Computer Co., Ltd.
InventorOsamu Negishi
Life of this patent
Estimating the term…
Abstract
A compact calculator includes a matrix type display unit and executes a graphic representation of a functional formula. When both the functional formula and an integral range are inputted as information about a definite integral, a judgement is done whether or not an X-value increased while forming a graphic representation is located with the integral range. If this X-value is present within the integral range, then the pixels from the coordinate point (X,Y) to an X-axis are turned on. Thus, the integral range is graphically represented under the above-described process operation.
Claims5
A compact calculator comprising:
- display means, having a dot-matrix type display panel, for graphically displaying a functional formula;
- display range data storage means for storing values of "X.sub.min ", "X.sub.max ", "Y.sub.min " and "Y.sub.max " corresponding to a representation range of a graph displayed on said display means;
- input means for inputting a functional formula and an integral range corresponding to a definite integral;
- formula storage means for storing the functional formula entered by the input means;
- integral range storage means for storing the integral range inputted by the input means;
- .DELTA.X-determining means for determining a variation value .DELTA.X corresponding to 1 dot of said display panel along an X-direction based upon the values of "X.sub.min " and "X.sub.max " stored in the display range data storage means;
- X-value storage means for storing an X-value given to the functional formula stored in the formula storage means;
- adding means for adding said X-value with said value .DELTA.X to produce an addition result and for inputting said addition result into the X-value storage means, said adding operation being executed while the X-value is between "X.sub.min " and "X.sub.max ";
- Y-value calculating means for substituting the X-value into the functional formula and for calculating a Y-value, every time the X-value stored in said X-value storage means is added by the value .DELTA.X;
- designating means for designating a dot on the display panel corresponding to said X-value and Y-value in order to turn on the dot;
- judging means for judging whether or not said X-value is located within the integral range stored in said integral range storage means when said designating means designates a dot on the display panel;
- and
- drawing means for turning on the dots of the display panel between the dot designated by the designating means and the X-axis when said judging means judges that the X-value is present within the integral range.
10 more elements
A graph forming apparatus comprising:
- display means having a dot matrix type display panel, said display means having an X-Y coordinate on said display panel;
- display range data storage means for storing values of "X.sub.min ", "X.sub.max " and "Y.sub.max " corresponding to a representation range of a graph display don said display means;
- means for storing boundary data including two values of X1 and X2 so as to specify a range in an X-direction;
- graph forming means for forming a graph representative of a formula "y=f(x)" on said display panel, said graph forming means including means for increasing the value of said "x" in said formula at a predetermined pitch from the value "X.sub.min " to the value "X.sub.max ", means for calculating the value of said f(x) in said formula every time said "x" is increased by the predetermined pitch to produce a calculation result, and plotting means for plotting points which constitute the graph on the display panel based upon the calculation result;
- judging means for judging whether or not the point plotted by said plotting means is located within the specific range indicated by said boundary data;
- and
- control means for turning on the dots between the point plotted by said plotting means and an X-axis, when said judging means determines that the plotted point is located within the specific range.
4 more elements
Dependencies are inferred from the claim text.