RRFcalc reads input a line at a time and treats it as commands for a calculator working in Reverse Polish Notation. It is convenient for interactive use, but it can be used non-interactively by supplying a file of commands as standard input.
After each line of input has been processed, the top item on the stack is displayed, unless the last command already displayed it. The commands available are:
| integer | read the integer (which must be non-negative) and put it on the stack. To get a negative number on the stack, you need to read in a positive number and use CHS to change the sign. |
| PP rrf | read the rest of the line as a root-rational-fraction in power-of-prime form, and put it on the stack. |
| + | Add: replace the top two elements on the stack by their sum. |
| - | Subtract (top-of-stack from the one below). To change the sign of the top-of-stack, use CHS. |
| * | Multiply |
| / | Divide (top-of-stack into the one below) |
| POWER n | raise to power n (n = integer or integer/2). |
| SQRT | = POWER 1/2. Note that it is an error to take the square root of a number which already contains half-odd-integer powers. |
| CHS | change sign |
| SWOP, SWAP | exchange top two items of stack |
| STO n | Store top-of-stack in memory n (1 ≤ n ≤ 25). The item is not removed from the stack. |
| RCL n | Recall from memory n to top-of-stack. |
| V | Verify top of stack. |
| LIST | List the entire stack using the current default verification mode. Top of stack is shown first. |
| VP | Verify top-of-stack in power-of-prime notation |
| VI | Verify top-of-stack as (a/b)*sqrt(c/d), where a, b, c and d are integers (standard default). |
| VF | Verify top-of-stack as a floating-point number. |
| VMP | Change default verification mode to power-of-prime. |
| VMI | Change default verification mode to (a/b)*sqrt(c/d). This is the usual default. |
| VMF | Change default verification mode to floating-point. |
| 0J, 3J, 6J, 9J | Calculate a Wigner 3j, 6j or 9j symbol and put it on the stack. 0J
calculates a 3j symbol for which all m values are zero. The full input
for these commands takes the form:
|
| POP | Delete the top member from the stack. |
| PUSH | Push the stack down, copying the top member. PUSHing an empty stack inserts zero. |
| CLR,CLEAR | Clear the stack. |
| PROMPT ‘string’ | Set prompt string. The string is output when the program is ready for the next line of commands. The default string is ‘:’. A null string may be set. |
| ECHO+ | Reflect each input line before obeying any commands. |
| ECHO- | Do not reflect input lines (default). |
| ( | Ignore rest of line. |
| ? | Give a summary of the available commands. |
| QUIT, Q | Quit. |