Scientific calculator with coordinate transformation and single line numeric value display

A scientific calculator capable of performing a transformation calculation yielding two calculation result values, the calculator comprising:

• an input device for entering at least two numerical values;
• a transformation command;
• and a replacement command;
• a processor responsively connected to the input device for calculating two calculation result values based on the two entered numerical values and the entry of the transformation command;
• a memory connected to the processor for storing, at least prior to entry of the transformation command, the numerical values entered from the input device and, subsequent to entry of the transformation command, the calculation result values calculated by the processor;
• a numerical value display connected to the processor for displaying, at any one moment subsequent to entry of the transformation command, one of the calculation result values;
• a guidance display connected to the processor for displaying an indicia which signifies a calculation process and a meaning of the numerical value displayed on the numerical value display;
• a symbol display connected to the processor which, upon display of one of the two calculation result values at the numerical value display, provides an indication that the other calculation result value is stored in the memory;
• and
• wherein the processor, in response to entry of the replacement command, exchanges the calculation result value stored in the memory and the value displayed by the numerical value display.