toSingleVariableFunction method
Generates a callable single variable function-tree.
Example:
final f = "2 * e^x".toSingleVariableFunction();
print(f(2)); // 14.778112197861299
Implementation
SingleVariableFunction toSingleVariableFunction(
[String variableName = "x"]) =>
SingleVariableFunction(fromExpression: this, withVariable: variableName);