/**
* Tries to fix a structural problem leading to an evaluation error, e.g. x(x+1) is interpreted as
* xcoord(x+1). This can be fixed by changing the structure to x*(x+1) for example.
*/
private void fixStructure() {
// get function variables for x, y, z
FunctionVariable xVar = null, yVar = null, zVar = null;
for (FunctionVariable fVar : fVars) {
if ("x".equals(fVar.toString())) xVar = fVar;
else if ("y".equals(fVar.toString())) yVar = fVar;
else if ("z".equals(fVar.toString())) zVar = fVar;
}
// try to replace x(x+1) by x*(x+1)
expression.replaceXYZnodes(xVar, yVar, zVar);
}
