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- RPN V1.00 900131 - Release notes by MLO
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- Excuse my bad english, folks ...
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- RPN is a computer program that simulates, on the AMIGA screen,
- an Hewlett-Packard pocket computer. A first version of RPN was written
- several years ago in FORTRAN for an HP21MX mini computer, then moved
- to a VAX; a BASIC version for IBM PC's was also written. Now RPN is
- translated in C (the better human creation after italian people) for
- Commodore Amiga; the compiler is Lattice C V5.04, and the original
- environment an Amiga 500 with 2.5 MBytes of Fast Ram, but the program
- must run on every configuration and should (with minimal changes) be
- compiled and linked using Manx's Aztec-C.
- The source files, the objects, and the MAKEFILE used to compile
- and link RPN are included: you are welcome to modify the source, if
- you will find some error (although tested, this program could contain
- errors - this is human) or if you do not like the aesthetics. But,
- please, send me your changes at the address that you will find at the
- end of this Read.Me file.
- The simulated pocket computer was originally an HP-32, then
- some features of HP-11C were also included; I assume that you are
- familiar with these pocket computer families, or at least with the
- Reverse Polish Notation (RPN) logic they use: RPN was introduced by
- Lukasiewicz in 1924, and is based over the statement "every function
- must be introduced immediately after the variables that are its
- arguments". All pocket computers use this logic for functions of a
- single argument, e.g. the square root: you type the number, then you
- select the "square root" function.
- RPN computers use the same logic for all functions, the four
- basic arithmetic operations included; in this way you do not need a
- key to start the computation (the "=" key), you do not need
- parenthesis, and you can inspect, access and modify every intermediate
- result. RPN has a four registers stack, and sixteen memory registers:
- six of them, from A to F, are used for temporary storage in
- statistical computations; but you can use all of them to store your
- temporary results. Stack and registers are always visible in a
- dedicate window.
- To start RPN simply type RPN from CLI; or double-click over the
- RPN icon (beware: real men do not use icons). You should obtain a main
- window with key gadgets to be selected using the mouse, and a string
- gadget (the Input Field - IF); and a secondary window showing the
- values stored in the stack and in the sixteen registers. You can use
- also pull-down menus to perform some operations.
- To input numerical values, select the IF gadget - or type a
- character that is suitable for numerical input, both in fixed point
- notation or in scientific notation, and the IF gadget will be selected
- for you. You can modify what you typed, because the IF will be read
- only when you deselect this string gadget (hitting the RETURN key; the
- value will be stored in the X register) or selecting a key gadget or a
- menu option (the numeric value will be stored in the X register and
- then the function you required will be performed on it).
- Every operation is tested against arithmetical errors, and the
- stack or the registers will be modified only if no error is detected;
- if you by mistake select a wrong, but legal, operation, you can
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- recover the stack and registers status selecting the Last X menu
- option and then the inverse of the last function.You can with RPN
- perform:
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- - The four basic arithmetic operations.
- - Inverse, square root, square, powers, percentage.
- - Exponential and logarithmic functions, both natural and
- decimal.
- - Trigonometric or hyperbolic sine, cosine and tangent and their
- inverse functions.
- - Convert angles to radians, sexagesimal and centesimal degrees;
- convert numbers from decimal to sexagesimal system, or the
- inverse; convert coordinates from rectangular to polar, or the
- inverse.
- - Statistical computations: mean, standard deviation, linear
- correlation coefficient, linear regression, coordinates of
- points on the linear regression line, errors on the ordinates
- with the Fisher's formula.
- - Direct arithmetic operations on memory registers.
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- For trigonometric functions, you can select angle measurements
- in radians or degrees, both sexagesimal or centesimal; all
- computations are performed in double precision (64 bits). The Inv key
- must be followed by Sin/Cos/Tan and indicates their inverse function;
- Hyp introduces the hyperbolic functions, and Inv Hyp, or Hyp Inv,
- their inverse.Reminder:
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- - The % key computes in X the X percentage of Y.
- - The sequences Recall "Operation" Register perform an Enter,
- then show in X the result of X "Operation" Register.
- - The sequences Store "Operation" Register store in Register the
- result of Register "Operation" X.
- - For the mean and the standard deviation: after hitting the Mean
- key you will find the mean in X and the standard deviation in
- Y.
- - Hitting the L.R. key, the linear regression line A+Bx is
- computed; you will find A in the X register, and B in Y. The
- memory registers A..F contain:
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- A Number of points
- B Sum of x values
- C Sum of the squares of the x's
- D Sum of the y's
- E Sum of the squares of the y's
- F Sum of the products x times y
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- - Polar coordinates: the radius is in X and the azimuth angle in
- Y.
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- About the author: please notify all modifications to:
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- Maurizio LORETI (or MLO, or I3NOO)
- Via G. Donizetti, 6
- 35010 CADONEGHE (PD)
- ITALY
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- Also reachable with E-Mail at the address you will find in the
- source headers.
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- LORETI at IPDINFN (BITNET)
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- Have fun!
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- MLO
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