hi rooters this is a simplified example of my code: void main() { float a=1.0; TF1 *f = new TF1 ( "f" , "[0]", 1, 10); f -> SetParameter(0,a); float b = 10.0; TF1 *g = new TF1( "g", "[0] * f", 1, 10); g -> SetParameter(0,10); TF1 *h = new TF1( "h", "g", 1, 10); } the problem is that the functions "g" and "h" are not equal, but h=b*g. if I change the definition of "f": float a = 1.0; TF1 *f = new TF1 ( "f" , "[0]", 1, 10); f -> SetParameter(0,a); to: TF1 *f = new TF1("f","1. *1.0",1,10) then h=g. So I assume, that the error in my code is connected with "SetParameter". why h!=g in example above? best regards ivan -- ----------------------------- *Ivan Brida* Department of Nuclear Physics <http://www.dnp.fmph.uniba.sk/> Faculty of mathematics, physics and informatics <http://www.uniba.sk/mffuk/> Comenius University <http://www.uniba.sk/webuk/> Mlynska Dolina 84248 Bratislava <http://www.bratislava.sk/> Slovak Republic <http://www.slovensko.com/> brida@fmph.uniba.sk
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