Otto Schaile wrote: > > Dear roots, > what do I wrong here: > * Version 1.00/10 25 April 1997 * > .... > root [0] x2=new TFormula("x2","x**2") > (class TFormula*)0x0 > root [1] xx2=new TF1("xx2","x2",400,1000) > > *ERROR 5 : > Invalid Syntax "*" The first statement using TFormula is OK. x**2 is recognized as a valid expression by the Root formula compiler. Note that this is illegal in C++. Use x^2 or x*x The second statement using TF1 contains an illegal syntax. What is "x2" ? May be you meant x**2 or x^2 ? Rene Brun
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