/usr/share/nrn/lib/hoc/grapher.hoc is in neuron 7.5-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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?0 UserClasses Grapher
A widget for graphing any set of expressions as a function of
an independent variable.
To pop up the widget say:
load_file("grahper.hoc") // reads this file
makegrapher() // simple way to pop up a new grapher
Graphers may be saved in a .session file.
?1 Usage
To use the grapher widget:
1) enter the independent variable name (press the button) eg. x
2) specify the y variables:
in the graph panel press the left button and select "Plot What?"
and enter an expression or variable to plot. eg. sin(x)
You can do this several times to plot several expressions.
3) either
press the Plot button.
the independent variable will range from the beginning
to the end of the x-axis
or
----
3) Specify the view from the graph panel popup menu by selecting the
"Set View" item. You may also want to fix this as the
Scene size by subsequently selecting the "Scene=View" item
4) If the y variables are actual functions of the independent variable
press the Plot button to see the plot. If the y variables
are in fact just variables then you will need a generator
statement that tells how to compute the y variables given
a value of the independent variable. eg. Just for fun you can
try entering the generator statement:
print x, sin(x)
?1 Examples
Example 1: plot sin(t)
1) PlotWhat: sin(t)
2) Plot
Example 2: plot of steady state m process in nrniv
1) Independent Var: x
2) Generator: rates_hh(x)
3) Set View: x: -100 50 y: 0 1
4) PlotWhat: minf_hh
5) Plot
Example 3: In context of Neuron Main Menu simulation
0) pop up grapher by selecting appropriate "New Graph" submenu item.
1) Independent Var: v_init
2) Generator: init()
3) PlotWhat: <any set of variables in any section>
4) SetView: x: -100 50 y:cancel
5) Plot
Example 4: peak inward current during voltage clamp
Replace the standard: proc advance() {fadvance()} with a procedure
that stores the peak inward current (and possibly sets stoprun=1
when you are past the peak). Then in the Grapher set Steps to 20
the independent variable to the voltage clamp amplitude and the
generator to run().
?1 abscissa
creating a grapher using
makegrapher(1)
will add an item for setting the x-expression and buttons
for specifying the limits of the independent variable
?1 PanelUsage
? Plot
For each value of the independent variable the generator statement
is executed (if it exists) and the PlotWhat expressions are plotted.
? EraseAll
Removes all expressions from the graph.
? Steps
Number of independent variable values used to make the graph.
For the small grapher, the range of the independent variable is
the length of the x-axis.
? IndependentVar
Dialog appears requesting the variable to be used as the independent
variable (default t). If the variable is undefined it will
be created.
? Generator
A statement to be executed after setting a value of the independent
variable but before plotting the expressions. This allows plotting
of variables that depend implicitly on the independent variable.
? IndepBegin
For a grapher made with makegrapher(1), specifies initial value
of the independent variable.
? IndepEnd
Specifies final value of independent variable.
? Xexpr
A grapher made with makegrapher(1) allows separate specification of
independent variable and the x axis plot functions. This allows
phase plane plots. The Xexpr may be any function of the independent
variable or an implicit function if a generator statement exists.
?0 User HocCode Grapher
*/
help ?0
t = 0 // make sure it is defined if used in ivoc context
strdef temp_string_
objectvar grapherlist, temp_object_
grapherlist = new List(1)
// grapher_doplt must be at top level for xexpr and plot to get the
// right symbols. execute would work even inside a template
proc grapher_doplt(){local x, i, j
j = 2
if ($2 > 100) {
j = sqrt($2)
}
stoprun = 0
for i=0, $2 {
x = $3 + $4*i
hoc_ac_ = x
if (!execute1($s5)) {
continue_dialog("Error in Generator statement")
break
}
if (i == 0) { // must be here in case valid expressions
/// depend on initial value of dependend variable
$o1.xexpr($s6)
$o1.begin()
}
$o1.plot(1)
if (i%j == 0) {
$o1.fastflush()
doEvents()
}
if (stoprun) break
}
$o1.flush()
}
begintemplate Grapher
public vbox, info, save, g, doplt
external grapher_doplt
objectvar g, vbox, hbox, this
strdef indep, xexpr, generate, body, temp
{x1=0 x2=0 steps=0}
proc init() {
indep = "t"
xexpr = "t"
generate = ""
x1 = 0
x2 = 10
steps = 100
vbox = new VBox()
vbox.ref(this)
vbox.save("save()")
vbox.intercept(1)
big = 0
if (numarg() == 1) {
big = $1
}
if (big == 1) {
initbig()
}else{
initsmall()
}
g = new Graph()
g.size(x1, x2, -10, 10)
change_x()
vbox.intercept(0)
}
proc initsmall() {
xpanel("PanelUsage", 1)
xbutton("Plot", "doplt_small()")
xbutton("Stop", "dostop()")
xpvalue("Steps", &steps)
xpanel()
exprval("Independent Var", indep, "change_indep()")
exprval("Generator", generate, "change_generate()")
}
proc dostop() {
execute("stoprun = 1")
}
proc initbig() {
xpanel("PanelUsage", 1)
xbutton("Plot", "doplt()")
xbutton("Erase All", "g.erase_all()")
xpanel()
xpanel("")
xpvalue("Indep Begin", &x1, 0)
xpvalue("Indep End", &x2, 0)
xpvalue("Steps", &steps)
xpanel()
exprval("Independent Var", indep, "change_indep()")
exprval("X-expr", xexpr, "change_xexpr()")
exprval("Generator", generate, "change_generate()")
}
proc doplt_small() {
x1 = g.size(1)
x2 = g.size(2)
doplt()
}
proc doplt() {local d
sprint(body, "{%s=hoc_ac_ %s}", indep, generate)
d = (x2 - x1)/steps
grapher_doplt(g, steps, x1, d, body, xexpr)
}
proc change_indep() {
temp = indep
while (string_dialog("Enter independent variable name", indep)) {
hoc_ac_ = x1
sprint(body, "%s = hoc_ac_", indep)
if (execute1(body) == 1) {
xexpr = indep
// g.erase_all()
return
}else{
continue_dialog("invalid independent variable")
}
}
indep = temp
}
proc change_xexpr() {
temp = xexpr
while (string_dialog("Enter x-axis expression", xexpr)) {
sprint(body, "hoc_ac = %s", xexpr)
if (execute1(body) == 1) {
return
}else{
continue_dialog("invalid expression")
}
}
xexpr = temp
}
proc change_x() {
if (x2 > x1) {
g.size(x1, x2, g.size(3), g.size(4))
}else if (x2 < x1) {
g.size(x2, x1, g.size(3), g.size(4))
}
}
proc change_generate() {
print "A generator statement is only required if x and y\
plot expressions are not explicit functions of the independent variable"
temp = generate
while (string_dialog("Enter Generator statement", generate)) {
return
}
generate = temp
}
proc exprval() {
xpanel("", 1)
xbutton($s1, $s3)
xvarlabel($s2)
xpanel()
}
proc save() {local i
vbox.save("load_file(\"grapher.hoc\")}\n{")
sprint(body, "ocbox_=new Grapher(%d)\n\
ocbox_.info(\"%s\",\"%s\", \"%s\", %g, %g, %g, %g, %d, %g, %g)",\
big, indep, xexpr, generate, g.size(1), g.size(2), g.size(3), g.size(4), steps,\
x1, x2)
vbox.save(body)
g.save_name("ocbox_.g", 1)
vbox.save("ocbox_ = ocbox_.vbox")
}
proc info() {
indep = $s1
sprint(body, "%s = 0", indep)
execute(body)
xexpr = $s2
generate = $s3
g.size($4, $5, $6, $7)
steps = $8
x1 = $9
x2 = $10
doNotify()
}
endtemplate Grapher
proc makegrapher() {local i
i=0
if (numarg()) {
i=$1
}
temp_object_ = new Grapher(i)
temp_object_.vbox.map("Grapher")
objectvar temp_object
}
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