Abstract: A print controller includes a processor and a memory. When an instruction to execute a specific calculation function is received, the processor obtains a calculation result related to the specific calculation function. When an instruction to print is received, if the instruction to execute the specific calculation function has been received a plurality of times without printing the calculation result related to the specific calculation function, which was obtained when the instruction to execute the calculation function was received one or more times before the instruction received at a last time of the plurality of times, the processor causes a printing device to print the calculation result related to the specific calculation function, which was obtained when the instruction to execute the specific calculation function was received at the last time of the plurality of times.

Abstract: When an arithmetic operation is performed on an inequality, a solution notation pattern composed of a combination of a symbol and an inequality sign symbol is determined on the basis of an expression, a solution, and an inequality sign symbol. With Line I/O being set as the calculation result display mode, the solution notation pattern data, for example, [A?X?B], is displayed in the upper part of a display unit. The values of the solutions [X1] [X2] corresponding to the symbols [A] [B] shown in the pattern data are displayed as [A=X1] [B=X2] in the lower part of the display unit. This makes it possible to display the solution of the inequality in an easy-to-understand manner.

Abstract: When the intake input mode is set and a 2D function key, such as “?{square root over ( )}” or “a/b,” is operated in a state where the cursor has been moved to an arbitrary position on the formula displayed on the display unit of an electronic calculator, the range of the formula covered by the input 2D function (or to be calculated) is determined on the basis of the position of the cursor by recognizing a formula part sandwiched by parentheses or a chunk of the formula part of a function with parentheses, recognizing a chunk of a formula part of a 2D function, recognizing a chunk of a formula part with successive numerals and characters, and recognizing the position of an arithmetic symbol (“+,” “?,” “×,” or “÷”) or a delimiter (“:” or “,”). The determined range is taken in by the input 2D function.

Abstract: A complex solver that is able to solve a diverse variety of model analytics. Upon identifying the various input variable(s) and output variable(s) of the model variables, if a straight forward solve is not to be performed, it is determined whether the model analytics is to be inverted such that a forward solve can be performed. For instance, it might not be known generally, or at least to the solver, how to invert a particular equation of other model analytics. If the model analytics is to be inverted, the model analytics is inverted, and the forward solve is performed. On the other hand, if the inversion of the model analytics is not to be performed, then a numerical analysis solve is performed.

Abstract: When the intake input mode is set and a 2D function key, such as “?{square root over ( )}” or “a/b,” is operated in a state where the cursor has been moved to an arbitrary position on the formula displayed on the display unit of an electronic calculator, the range of the formula covered by the input 2D function (or to be calculated) is determined on the basis of the position of the cursor by recognizing a formula part sandwiched by parentheses or a chunk of the formula part of a function with parentheses, recognizing a chunk of a formula part of a 2D function, recognizing a chunk of a formula part with successive numerals and characters, and recognizing the position of an arithmetic symbol (“+,” “?,” “×,” or “÷”) or a delimiter (“:” or “,”) The determined range is taken in by the input 2D function.

Abstract: An electronic calculator includes: a display device; a user interface; a memory device; and a processor that is operable with the memory device to: perform a calculation to convert a fractional number into a decimal number; control the display device to display the decimal number, when the decimal number is a repeating decimal, with a symbol indicating a periodic block included in the repeating decimal control the display device to display a scroll indicator indicating that the displayed repeating decimal is scrollable when the number of digits included in the repeating decimal overflows the number of digits displayable by the display device; control the display device to display an undisplayed part of the repeating decimal to scroll in when a scroll command is input by the user through the user interface while the scroll indicator is displayed.

Abstract: When an arithmetic operation is performed on an inequality, a solution notation pattern composed of a combination of a symbol and an inequality sign symbol is determined on the basis of an expression, a solution, and an inequality sign symbol. With Line I/O being set as the calculation result display mode, the solution notation pattern data, for example, [A?X?B], is displayed in the upper part of a display unit. The values of the solutions [X1] [X2] corresponding to the symbols [A] [B] shown in the pattern data are displayed as [A=X1] [B=X2] in the lower part of the display unit. This makes it possible to display the solution of the inequality in an easy-to-understand manner.

Abstract: Method for automatically adding scale symbol to operation formula during operation and system for executing the method. The system includes: an input unit for keying in operands and choosing the scale thereof; an input/output buffering unit for temporarily storing the input data; a synchronously checking unit for checking the whether the input operands conform with the scale; a scale symbol adding unit for reading and automatically providing the symbol of the scale and sending the symbol to the input/output buffering unit and a mathematic logic calculating unit to be operated and wait for further instruction. After operated, the data are displayed by an output unit or stored in a memory. The data can be stored in both a read-only memory for check in next use or temporarily stored in a dynamic random access memory for checking the data source of the result and the scale.

Abstract: The present invention relates to a process and method for printing, utilizing a computer and computer printer, a scale instrument and conversion tool to be used in preparing and interpreting scaled drawings, maps, aerial photographs, graphs and similar documents. The instrument can be printed on paper, plastic film, or any flexible media capable of being processed by a computer printer. The invention includes a sub-process to not only print a scale denominated in the various scales typically used in preparing scaled drawings, etc., but also to print a scale denominated in any other scale to be used in interpreting a drawing, etc., which is not longer presented in the original scale due to reproduction, shrinkage, enlargement, or reduction.

Abstract: Method for automatically adding scale symbol to operation formula during operation and system for executing the method. The system includes: an input unit for keying in operands and choosing the scale thereof; an input/output buffering unit for temporarily storing the input data; a synchronously checking unit for checking the whether the input operands conform with the scale; a scale symbol adding unit for reading and automatically providing the symbol of the scale and sending the symbol to the input/output buffering unit and a mathematic logic calculating unit to be operated and wait for further instruction. After operated, the data are displayed by an output unit or stored in a memory. The data can be stored in both a read-only memory for check in next use or temporarily stored in a dynamic random access memory for checking the data source of the result and the scale.

Abstract: A computing device (40) comprises an electrical circuit and a software application. A display screen (138) and an input device (140) are electrically coupled to the electrical circuit. The software application provides instructions to determine the number of significant figures for a number entered via the input device, and simultaneously display on the display screen the entered number along with the number of significant figures for the entered number, and/or the software application provides instructions to calculate a floating point answer for a mathematical operation entered for one or more numbers entered into the computing device, round the floating point answer to the proper precision or to the proper number of significant figures, determine the number of significant figures for the rounded answer, and simultaneously display on the display the rounded answer and its number of significant figures.