Help System (web edition)

PLOT INTEGRAL Y(X)=f(X)  (X can be any 'word')
plots the integral function of f(X). The range of integration and
plotting is given in the form X=<lower limit>,<upper limit>,<step>.
If the limits and the step (which is used both in integration and
plotting) is not given, XSCALE determines them and 1/100 of the
range is used as <step>.

See also extra specification INTEGRAL which can be used for normalizing
of the integral on the whole range.

For example,
PLOT INTEGRAL Y(X)=EXP(-0.5*(X/sigma)^2)
     INTEGRAL=1 XSCALE=-8(2)8 YSCALE=0(0.1)1 sigma=1,2,0.5

plots the cumulative distribution function of N(0,sigma^2) for
sigma=1,1.5,2. Observe that INTEGRAL=1 normalizes the integral
to 1 on the interval (-8,8) in this case and so the constant multiplier
1/(sqr(2*pi)*sigma) can be dropped from the normal density.
  C = More information on curve plotting