Difference between revisions of "CDC run 2016 drift time fits"
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{| border="0" cellpadding="2" | {| border="0" cellpadding="2" | ||
|[[Image:cdc_run2016_time.png|thumb|x200px|time vs straw number n]] | |[[Image:cdc_run2016_time.png|thumb|x200px|time vs straw number n]] | ||
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|} | |} | ||
− | + | <pre> | |
+ | TF1 *f = new TF1("f","[0]*(1+[1]*exp(([3]-x)/[2])+[7]*exp(([3]-x)/[8]))/((1+exp(([3]-x)/[5]))*(1+exp((x-[4])/[6])))",400,1400); | ||
+ | f->SetParameter(0,20); //overall height | ||
+ | f->SetParameter(1,20); //amplitude of first exp contrib to peak | ||
+ | f->SetParameter(2,10); //first exp fall-off | ||
+ | f->SetParameter(3,550); //t0 | ||
+ | f->SetParameter(4,1200); //tmax | ||
+ | f->SetParameter(5,2); //slope up of t0 edge | ||
+ | f->SetParameter(6,5); //slope down of tmax edge | ||
+ | f->SetParameter(7,3); //amplitude of first second contrib to peak | ||
+ | f->SetParameter(8,100); //second exp fall-off | ||
+ | </pre> | ||
{| border="0" cellpadding="2" | {| border="0" cellpadding="2" | ||
|[[Image:cdc_run2016_amp.png|thumb|x50px|amplitude vs n]] | |[[Image:cdc_run2016_amp.png|thumb|x50px|amplitude vs n]] | ||
|} | |} |
Revision as of 17:37, 18 December 2014
TF1 *f = new TF1("f","[0]*(1+[1]*exp(([3]-x)/[2])+[7]*exp(([3]-x)/[8]))/((1+exp(([3]-x)/[5]))*(1+exp((x-[4])/[6])))",400,1400); f->SetParameter(0,20); //overall height f->SetParameter(1,20); //amplitude of first exp contrib to peak f->SetParameter(2,10); //first exp fall-off f->SetParameter(3,550); //t0 f->SetParameter(4,1200); //tmax f->SetParameter(5,2); //slope up of t0 edge f->SetParameter(6,5); //slope down of tmax edge f->SetParameter(7,3); //amplitude of first second contrib to peak f->SetParameter(8,100); //second exp fall-off