----  Defining Functions to be Plotted  ----


Cartesian:
    Yn = f(X)    Where 'n' is in the range 1 to 4 (default is 1).

Cartesian parametric:
    Yn = f(T)
    Xn = f(T)

Polar:
    Rn = f(A)     Radius as a function of angle. 'n' is in the range 1 to 4.

Polar parametric:
    Rn = f(T)     Define radius for function 'n' (1 to 4)
    An = f(T)     Define angle for function 'n' (1 to 4)


                 ---- Items that can be part of expressions ----



----  Arithmetic operators ----         |    ----  Built in constants ----
                                        |
  +        Addition                     |      PI     Pi (3.14159....)
  -        Subtraction (or unary minus) |       E      Base of logs (2.718...)
  *        Multiplication               |
  /        Division                     |    ----  Parameters  ----
  ** or ^  Exponentation                |      P0, P1, ..., P9

                 ----  Built in functions  ----

ABS(x) -- Absolute value.               LOG10(x) -- Log base 10.
ACOS(x) -- Arc cosine.                  MAX(a,b) -- Larger of a or b.
ASIN(x) -- Arc sine.                    MIN(a,b) -- Smaller of a or b.
ATAN(x) -- Arc tangent.                 NORMAL(x) -- Normal probability distrib.
COS(x) -- Cosine.                       PULSE(a,x,b) -- 1 if a<=x<=b, else 0.
CSC(x) -- Cosecant.                     RAD(x) -- Convert degrees to radians.
COSH(x) -- Hyperbolic cosine.           SEC(x) -- Secant.
COT(x) -- Cotangent.                    SIN(x) -- Sine.
DEG(x) -- Convert radians to degrees.   SINH(x) -- Hyperbolic sine.
EXP(x) -- e to x power.                 SQRT(x) -- Square root.
GAMMA(x) -- Gamma function.             STEP(a,x) -- 1 if a<=x, else 0.
GAMMAI(x) -- 1/Gamma function.          TAN(x) -- Tangent.
HAV(x) -- Haversine.                    TANH(x) -- Hyperbolic tangent.
J0(x) -- Bessel, 1st kind, order 0.     Y0(x) -- Bessel, 2nd kind, order 0.
J1(x) -- Bessel, 1st kind, order 1.     Y1(x) -- Bessel, 2nd kind, order 1.
JN(n,x) -- Bessel, 1st kind, order n.   YN(n,x) -- Bessel, 2nd kind, order n.
LOG(x) -- Natural log.

                      ----  Commands ----

AXES {ON | OFF} (default=OFF) -- Display axes without labels.

CALCULATE cexpr -- Calculate and print the value of an expression.

CAXES cexpr (default=3) -- Set color for axes and labels.

CFn cexpr (default=2,1,4,3) -- Set color for plot of function 'n'.

CGRID cexpr (default=8) -- Set color for grid lines.

CLEAR -- Clear the screen.

COMMONSCALE {ON | OFF} (default=OFF) -- Force X and Y axes to have same scale.

CTITLE cexpr (default=7) -- Set color for title line.

DATA filespec -- Read data values from specified file.

DISPLAY string -- Display the string on the console.

                  ----  More commands ----

DO filespec -- Execute commands stored in external file.

EXIT  -- Exit from MATHPLOT and return to DOS.

GRID {ON | OFF} (default=OFF) -- Control display of grid lines.

LABEL {ON | OFF} (default=OFF) -- Control display of axis labels.

LIST {ON | OFF} (default=OFF) -- List files executed by DO command.

NUMPOINTS cexpr (default=100) -- Number of points to evaluate and plot.

ORIGIN {ON | OFF} (default=OFF) -- Force origin (0,0) to be displayed.

PAUSE [cexpr] -- Pause for specified number of seconds or until key is pressed.

PLOT -- Evaluate and plot the currently defined function(s).

Pn cexpr -- Specify value for parameter P0, P1, ..., P9.

                  ----  More commands ----

RANGE cexpr,cexpr (default=0,2*pi) -- Set data range to be plotted.

RESET -- Reset all parameters to initial values and remove functions.

SAVE filespec -- Save current plot description in external file.

TABULATE -- Evaluate functions and list values.

TITLE string -- Specify title for plot.