Re: [jep-users] Finding constants and variables

[Richard Morris]

Karthik

The problem with your code is that its missing a VariableFactory, a
class used to actually make the variables.
VariableTable vtsrc = jep.getVariableTable();
VariableTable vt = new VariableTable();

// this is the line your missing
vt.setVariableFactory(new VariableFactory());

vt.copyVariablesFrom(vtsrc); //throws null pointer exception


Its probably not the easiest way to get a list of variables, its
easiest just to get the list of variables and iterate through the list
removing the constants


jep.addVariable("x", 5.0);
jep.addVariable("y", 5.0);
jep.addVariable("z", 5.0);

Collection<Variable> vars = vtsrc.getVariables();
System.out.println("before");
System.out.println(vars);
Iterator<Variable> itt = vars.iterator();
while(itt.hasNext()) {
Variable v=itt.next();
if(v.isConstant()) {
itt.remove();
}
}
System.out.println("after");
System.out.println(vars);

Richard

On Tue, Oct 2, 2012 at 9:03 AM, <krno...@gmail.com> wrote:
> Hi,
>
> I am trying to find a way to get only the list of variables without the
> constants. I found VariableTable.copyVariablesFrom and copyConstantsFrom but
> when i used it I get a null pointer exception.
>
> VariableTable vtsrc = jep.getVariableTable();
> VariableTable vt = new VariableTable();
> vt.copyVariablesFrom(vtsrc); //throws null pointer exception
>
> Is there something wrong in the way I am using this?
>
> thanks
> Karthik
>
>
>
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