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ROOT::Experimental::TAxisGrow Class Reference

An axis that can extend its range, keeping the number of its bins unchanged.

The axis is constructed with an initial range. Apart from its ability to grow, this axis behaves like a TAxisEquidistant.

Definition at line 434 of file TAxis.hxx.

Public Member Functions

 TAxisGrow (std::string_view title, int nbins, double low, double high) noexcept
 Initialize a TAxisGrow. More...
 
 TAxisGrow (int nbins, double low, double high) noexcept
 Initialize a TAxisGrow. More...
 
bool CanGrow () const
 This axis kind can increase its range. More...
 
int Grow (int toBin)
 Grow this axis to make the "virtual bin" toBin in-range. More...
 
- Public Member Functions inherited from ROOT::Experimental::TAxisEquidistant
 TAxisEquidistant ()=default
 
 TAxisEquidistant (int nbinsNoOver, double low, double high) noexcept
 Initialize a TAxisEquidistant. More...
 
 TAxisEquidistant (std::string_view title, int nbinsNoOver, double low, double high) noexcept
 Initialize a TAxisEquidistant. More...
 
int FindBin (double x) const noexcept
 Find the bin index for the given coordinate. More...
 
double GetBinCenter (int bin) const noexcept
 Get the bin center for the given bin index. More...
 
double GetBinFrom (int bin) const noexcept
 Get the low bin border for the given bin index. More...
 
int GetBinIndexForLowEdge (double x) const noexcept
 If the coordinate x is a bin low edge (within 1E-6 of the coordinate), return the bin for which this is a low edge. More...
 
double GetBinTo (int bin) const noexcept
 Get the high bin border for the given bin index. More...
 
double GetBinWidth () const noexcept
 Get the width of the bins. More...
 
double GetInverseBinWidth () const noexcept
 Get the inverse of the width of the bins. More...
 
double GetMaximum () const noexcept
 Get the high end of the axis range. More...
 
double GetMinimum () const noexcept
 Get the low end of the axis range. More...
 
- Public Member Functions inherited from ROOT::Experimental::TAxisBase
 TAxisBase (int nbinsNoOver, bool canGrow) noexcept
 Construct a TAxisBase. More...
 
 TAxisBase (std::string_view title, int nbinsNoOver, bool canGrow) noexcept
 Construct a TAxisBase. More...
 
int GetNBins () const noexcept
 Get the number of bins, including under- and overflow. More...
 
int GetNBinsNoOver () const noexcept
 Get the number of bins, excluding under- and overflow. More...
 
int GetNOverflowBins () const noexcept
 Get the number of over- and underflow bins: 0 for growable axes, 2 otherwise. More...
 
int GetOverflowBin () const noexcept
 Get the bin index for the underflow bin (or the next bin outside range if CanGrow()). More...
 
const std::string & GetTitle () const
 
int GetUnderflowBin () const noexcept
 Get the bin index for the underflow bin. More...
 
bool IsOverflowBin (int bin) const noexcept
 Whether the bin index is referencing a bin higher than the axis range. More...
 
bool IsUnderflowBin (int bin) const noexcept
 Whether the bin index is referencing a bin lower than the axis range. More...
 
const_iterator begin () const noexcept
 Get a const_iterator pointing to the first non-underflow bin. More...
 
const_iterator begin_with_underflow () const noexcept
 Get a const_iterator pointing the underflow bin. More...
 
const_iterator end () const noexcept
 Get a const_iterator pointing right beyond the last non-overflow bin (i.e. More...
 
const_iterator end_with_overflow () const noexcept
 Get a const_iterator pointing right beyond the overflow bin. More...
 

Additional Inherited Members

- Public Types inherited from ROOT::Experimental::TAxisBase
enum  EFindStatus { EFindStatus::kCanGrow, EFindStatus::kValid }
 Status of FindBin(x) More...
 
- Static Public Member Functions inherited from ROOT::Experimental::TAxisEquidistant
static bool CanGrow () noexcept
 This axis cannot grow. More...
 
- Static Public Attributes inherited from ROOT::Experimental::TAxisBase
static constexpr const int kIgnoreBin = -1
 FindBin() returns this bin to signal that the bin number is invalid. More...
 
static constexpr const int kNOverflowBins [4] = {0, 1, 1, 2}
 Extra bins for each EAxisOverflow value. More...
 
- Protected Member Functions inherited from ROOT::Experimental::TAxisEquidistant
 TAxisEquidistant (int nbinsNoOver, double low, double high, bool canGrow) noexcept
 Initialize a TAxisEquidistant. More...
 
 TAxisEquidistant (std::string_view title, int nbinsNoOver, double low, double high, bool canGrow) noexcept
 Initialize a TAxisEquidistant. More...
 
- Protected Member Functions inherited from ROOT::Experimental::TAxisBase
 TAxisBase ()
 Default construct a TAxisBase (for use by derived classes for I/O) More...
 
int AdjustOverflowBinNumber (int rawbin) const
 Given rawbin (<0 for underflow, >= GetNBinsNoOver() for overflow), determine the actual bin number taking into account how over/underflow should be handled. More...
 
 TAxisBase (const TAxisBase &)=default
 
 TAxisBase (TAxisBase &&)=default
 
TAxisBaseoperator= (const TAxisBase &)=default
 
TAxisBaseoperator= (TAxisBase &&)=default
 
- Static Protected Member Functions inherited from ROOT::Experimental::TAxisEquidistant
static double GetInvBinWidth (int nbinsNoOver, double lowOrHigh, double highOrLow)
 Determine the inverse bin width. More...
 
- Protected Attributes inherited from ROOT::Experimental::TAxisEquidistant
double fInvBinWidth = 0.
 The inverse of the bin width. More...
 
double fLow = 0.
 The lower limit of the axis. More...
 

#include <ROOT/TAxis.hxx>

Inheritance diagram for ROOT::Experimental::TAxisGrow:
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Constructor & Destructor Documentation

◆ TAxisGrow() [1/2]

ROOT::Experimental::TAxisGrow::TAxisGrow ( std::string_view  title,
int  nbins,
double  low,
double  high 
)
inlineexplicitnoexcept

Initialize a TAxisGrow.

Parameters
nbins- number of bins in the axis, excluding under- and overflow bins. This value is fixed over the lifetime of the object.
low- the initial value for the low axis range. Any coordinate below that is considered as underflow. To trigger the growing of the axis call Grow().
high- the initial value for the high axis range. Any coordinate above that is considered as overflow. To trigger the growing of the axis call Grow()

Definition at line 445 of file TAxis.hxx.

◆ TAxisGrow() [2/2]

ROOT::Experimental::TAxisGrow::TAxisGrow ( int  nbins,
double  low,
double  high 
)
inlineexplicitnoexcept

Initialize a TAxisGrow.

Parameters
[in]title- axis title used for graphics and text representation.
nbins- number of bins in the axis, excluding under- and overflow bins. This value is fixed over the lifetime of the object.
low- the initial value for the low axis range. Any coordinate below that is considered as underflow. To trigger the growing of the axis call Grow().
high- the initial value for the high axis range. Any coordinate above that is considered as overflow. To trigger the growing of the axis call Grow()

Definition at line 459 of file TAxis.hxx.

Member Function Documentation

◆ CanGrow()

bool ROOT::Experimental::TAxisGrow::CanGrow ( ) const
inline

This axis kind can increase its range.

Definition at line 489 of file TAxis.hxx.

◆ Grow()

int ROOT::Experimental::TAxisGrow::Grow ( int  toBin)

Grow this axis to make the "virtual bin" toBin in-range.

This keeps the non-affected axis limit unchanged, and extends the other axis limit such that a number of consecutive bins are merged.

Example, assuming an initial TAxisGrow with 10 bins from 0. to 1.:

  • Grow(0): that (virtual) bin spans from -0.1 to 0. To include it in the axis range, the lower limit must be shifted. The minimal number of bins that can be merged is 2, thus the new axis will span from -1. to 1.
  • Grow(-1): that (virtual) bin spans from -0.2 to 0.1. To include it in the axis range, the lower limit must be shifted. The minimal number of bins that can be merged is 2, thus the new axis will span from -1. to 1.
  • Grow(50): that (virtual) bin spans from 4.9 to 5.0. To include it in the axis range, the higher limit must be shifted. Five bins need to be merged, making the new axis range 0. to 5.0.
Parameters
toBin- the "virtual" bin number, as if the axis had an infinite number of bins with the current bin width. For instance, for an axis with ten bins in the range 0. to 1., the coordinate 2.05 has the virtual bin index 20.
Returns
Returns the number of bins that were merged to reach the value. A value of 1 means that no bins were merged (toBin was in the original axis range).

The documentation for this class was generated from the following file: