Graphical calculator with hierarchical view of usage history

A computer-readable storage medium storing computer-executable instructions that when executed by a computer cause the computer to perform a method on a calculator display generated on a limited region of a screen, the method comprising:

• receiving a first mathematical expression in an expression entry area on a calculator;
• displaying results in a first window on the calculator, wherein the results displayed in the first window comprise a result for the first mathematical expression;
• displaying, in a second window on the calculator, a usage history comprising the first mathematical expression, a second mathematical expression, and results displayed in the second window, wherein the results displayed in the second window comprise the result for the first mathematical expression and a result for the second mathematical expression, wherein the usage history is displayed in a hierarchical tree such that a result for a given mathematical expression is displayed in the second window on a different hierarchical level than the given mathematical expression;
• and
• displaying organizational tabs for the second window, wherein each organizational tab is operable to display a given category of data associated with the usage history, and
• wherein the results in the first window and the results in the second window are displayed simultaneously.

A method for displaying usage history of a calculator, the calculator having a user interface, the method comprising:

• receiving a first mathematical expression in an expression entry area on the calculator:
• displaying a result in a first window on the calculator, wherein the result displayed in the first window comprises a result for the first mathematical expression;
• displaying, in a second window on the calculator, a usage history comprising the first mathematical expression, a second mathematical expression, and results, wherein the results displayed in the second window comprise the result for the first mathematical expression and a result for the second mathematical expression, wherein the usage history is displayed in a hierarchical tree such that a result for a given mathematical expression is displayed on a different hierarchical level than the given mathematical expression;
• and
• displaying organizational tabs for the second window, wherein each organizational tab is operable to display a given category of data associated with the usage history,
• wherein the hierarchical tree is expandable and collapsible, and
• wherein the hierarchical tree can be expanded and collapsed while the result is displayed in the first window.

A calculator comprising:

• an expression entry area operable to receive mathematical expressions;
• a first display area that displays at least some results from evaluating the received mathematical expressions;
• a second display area operable to display a usage history, the usage history comprising the at least some results from evaluating the received mathematical expressions and the received mathematical expressions, wherein the usage history is displayed in a hierarchical format, wherein the results are displayable on a parent level that is expandable to display the received mathematical expressions on a sub-level, wherein the first and the second display areas are non-overlapping display areas, and wherein the calculator is configured to simultaneously display in the second display area results displayed in the first display area;
• and
• an organizational tab area operable to display organizational tabs for the second display area, wherein each organizational tab is operable to display a given category of data associated with the usage history.

A computer-readable storage medium storing computer-executable instructions that when executed by a computer cause the computer to generate a calculator display on a limited region of a screen, the calculator display comprising:

• an expression entry area operable to receive a first mathematical expression;
• a first display area configured to display a result for at least the first mathematical expression received in the expression entry area;
• a second display area operable to display a usage history comprising the first mathematical expression, a second mathematical expression, and results, wherein the results displayed in the second display area comprise the result for the first mathematical expression and a result for the second mathematical expression, wherein the usage history is displayed in a hierarchical format such that a result for a given mathematical expression is displayed on a different hierarchical level than the given mathematical expression, and wherein the first and the second display areas are non-overlapping display areas;
• and
• an organizational tab area operable to display organizational tabs for the second display area, wherein each organizational tab is operable to display a given category of data associated with the usage history.

A calculator comprising:

• a means for a user to enter a first mathematical expression;
• a means for displaying a result for the first mathematical expression in a first display area;
• a means for displaying a usage history in a second display area, the usage history comprising the first mathematical expression, a second mathematical expression, and results, wherein the results displayed in the second display area comprise the result for the first mathematical expression and a result for the second mathematical expression, wherein the usage history is displayed in a hierarchical tree such that a result for a given mathematical expression is displayed on a different hierarchical level than the given mathematical expression;
• and
• a means for displaying a plurality of organizational tabs for the second display area, wherein each organizational tab is operable to display a given category of data associated with the usage history and at least one of the mathematical expression and the result.