Difference between revisions of "ForestErrAnal Lab 8.C"
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(Created page with 'void DataRead() { TH1F *LengthHist=new TH1F("LengthHist","LengthHist",30,18.45,21.45); ifstream in; in.open("length.dat"); Float_t Length,LengthErr; Int_t Counts; Int...') |
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| Line 1: | Line 1: | ||
| + | <pre> | ||
void DataRead() { | void DataRead() { | ||
TH1F *LengthHist=new TH1F("LengthHist","LengthHist",30,18.45,21.45); | TH1F *LengthHist=new TH1F("LengthHist","LengthHist",30,18.45,21.45); | ||
| Line 20: | Line 21: | ||
LengthHist->Draw(); | LengthHist->Draw(); | ||
} | } | ||
| + | </pre> | ||
Revision as of 17:28, 22 February 2010
void DataRead() {
TH1F *LengthHist=new TH1F("LengthHist","LengthHist",30,18.45,21.45);
ifstream in;
in.open("length.dat");
Float_t Length,LengthErr;
Int_t Counts;
Int_t nlines=0;
while(in.good()){
in >> Length >> Counts;
if(Counts>0)
LengthErr=0.5/sqrt(Counts);
printf( " %d \t %f +/- %f \t %d\n", nlines, Length, LengthErr, Counts);
/*
*/
nlines++;
LengthHist->Fill(Length,Counts);
}
LengthHist->Draw();
}