Hello, I really have to deal with the problem below. I am a beginner in matlab and my deadline is quite pressing. Thank you in advance! Well, I have to guess an initial value "n" in order to find the ultimate value "Pu". When the extracting Pu deviates from a specific defined value (Pe) more than 0.1% then I need the code to make use of the last value of "Pu" to find the correct n until the parameter "Pu"reach the Pe. Otherwise the parameter n is kept. such as: input: n results: Pu target: pe dp=pu-pe if dp<0.1% keep n or else n=n+dn and again from the begining until the Pe is reached! Thanks!!