graphmode

obsolete

obsolete. see graph . Use Graph .

graph

obsolete

NAME

graph --- multiple line plots

SYNTAX

graph()
graph(expression, setup)
graph(t)
graphmode(mode)

DESCRIPTION

Graph() solves the problem of obtaining multiple line plots during a single run. During calls to graph(t), specified variables are stored and plotted using scales determined by calls to axis().

OPTIONS

graph(): erases the old list and starts a new (empty) list of plot expressions and setup statements.
graph(s1, s2): Adds a new plot specification to the graph list. s1 must be string which contains an expression, usually a variable. e.g "y". s2 is a string which contains any number of statements used to initialize axes. etc. E.G "axis(0,5,1,-1,1,2) axis()".
graph(t): The current value of each expression in the graph list is saved along with the abscissa value, t. The line plots are flushed every 50 points.
graphmode(1): Executes the list of setup statements. This is also done on the first call to graph(t) after a new setup statement is added to the list.
graphmode(-1): Flushes the stored plots. Subsequent calls to graph(t) will start new lines. Should be executed just before a plt(-1) to ensure the entire lines are plotted.
graphmode(2): Flushes the stored plots. Subsequent calls to graph(t) will continue the lines. Graphs are normally flushed every 50 points.

EXAMPLES

proc p() { /* plot ramp */
   axis(100,300,450,200)
   axis(0,15,3,-1,1,2)
   axis()
   plot(1)
   for (x=0; x<15; x=x+.1) {
      plot(x, x/15)	/* ramp */
      graph(x) /* plots graph list if any */
   }
   graph(-1) /* flush remaining part of graphs, if any */
   plt(-1)
}	

p()    /*plots the ramp alone*/

graph()
graph("sin(x)","axis(100,300,100,300) axis()")
graph("cos(x)","")  /* same axes as previous call to graph */

p()    /*plots the sin and cos along with the ramp*/

DIAGNOSTICS

The strings are parsed when graph(s1, s2) is executed. The strings are executed on calls to graph(t).

The best method for complicated plots is to make the setup string a simple call to a user defined procedure. This procedure can setup the axes, write the labels, etc. Newlines and strings within strings are possible by quoting with the `\verb+\+' character but generally are too confusing to be practical.

Local variables in graph strings make no sense.