CH ROOT Nonuniform Binning

Rebinning via Energy Calibration

Regarding use of 4096 channel peak sensing ADC

• Creates an array 4097 entries long to be used for bin edges

double bins[4097];

• Opens a for loop for bin creation

for(int i=0; i<=4096; i++){

• Fills arrays with values for bin edges using the energy calibration fit for HPGe detector

bins[i] =  i*i*(-0.000000861277) + i*(0.449519)-36.2928;

• Cout statement to print bin edges to the terminal window as for loop is processing

cout << bins[i] << endl;

• Closes the for loop and begins evaluation

} 

At this point you should have an array filled with values for bin edges. Note that channel zero is now mapped to ~ -36KeV

Creating a Histogram Using bins[i]

• Initialize the histogram you want to use. The value 4096 is found by (length of array) - 1

TH1F Gd_In = TH1F("Gd_In","",4096,bins)

Debugging

Error: Bins must be in increasing order

This error was thrown by having an integer at +1 the value it should have been at when making the histogram. The following should allow you to find bins that are at a lower value than the previous. This for loop will parse through the entire bins array and print the bins

for(int i=0; i<=4096; i++){
if(bins[i]>=bins[i+1]){cout << i  <<"    " << bins[i] <<"     " << bins[i+1] << endl;
}

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