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root:setaxisrange [2010/11/09 16:08] – created nchiap | root:setaxisrange [2014/03/11 10:20] (current) – [X Axis of TGraph] add missing call to GetXaxis nchiap | ||
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====== Set Display Range of Axis ====== | ====== Set Display Range of Axis ====== | ||
+ | The normal way to change the display range of an axis is: | ||
<code C++> | <code C++> | ||
histogram-> | histogram-> | ||
</ | </ | ||
+ | |||
+ | but there are several situations where this fails. See below for help in these cases. | ||
+ | |||
+ | ===== Y Axis of a normalized Histogram ===== | ||
+ | Assume you have a histogram which has been normalized it with | ||
+ | <code c++> | ||
+ | hist-> | ||
+ | </ | ||
+ | Your Y-axis will show values between 0 and 1. | ||
+ | Trying to set the Y range using these values, eg. | ||
+ | <code c++> | ||
+ | will fail however. | ||
+ | You still need to give the range in the original unnormalized units. | ||
+ | |||
+ | You can scale normalized units back with: | ||
+ | <code C++> | ||
+ | Double_t scaleY = hist-> | ||
+ | hist-> | ||
+ | </ | ||
+ | |||
+ | ===== Y Axis of a THStack ===== | ||
+ | Do not try to '' | ||
+ | Instead use the following code: | ||
+ | <code c++> | ||
+ | THStack *hs = new THStack(" | ||
+ | hs-> | ||
+ | hs-> | ||
+ | </ | ||
+ | |||
===== X Axis of TGraph ===== | ===== X Axis of TGraph ===== | ||
Line 12: | Line 42: | ||
TGraph* myGraph = new TGraph(); | TGraph* myGraph = new TGraph(); | ||
... | ... | ||
- | myGraph-> | + | myGraph-> |
</ | </ | ||