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Full Discussion: difference between double inverted coma and single inverted comma
Top Forums Shell Programming and Scripting difference between double inverted coma and single inverted comma Post 302107229 by jim mcnamara on Thursday 15th of February 2007 10:03:27 AM
Old 02-15-2007
Code:
'  is a tic or tic-mark or single quote
" is a double quote

quotes affect how the shell treats a variable.
Code:
if [ -f $filename ] translates $filename - if it has spaces the shell "thinks" $filename
         is really separate values  with no spaces
if [ -f "$filename" ] translates $filename - if it has spaces the shell "thinks" $filename
         is realy one single value, spaces included
if [ -f '$filename' ] does not translate filename - the shell takes the $ literally, not
         as a shell token meaning return the value of a variable

 

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LEARN ABOUT DEBIAN

qwtdoubleinterval

QwtDoubleInterval(3)						 Qwt User's Guide					      QwtDoubleInterval(3)

NAME

       QwtDoubleInterval -

       A class representing an interval.

SYNOPSIS

       #include <qwt_double_interval.h>

   Public Types
       enum BorderMode { IncludeBorders =  0, ExcludeMinimum =	1, ExcludeMaximum =  2, ExcludeBorders =  ExcludeMinimum | ExcludeMaximum }

   Public Member Functions
       int borderFlags () const
       bool contains (double value) const
       QwtDoubleInterval extend (double value) const
       QwtDoubleInterval intersect (const QwtDoubleInterval &) const
       bool intersects (const QwtDoubleInterval &) const
       void invalidate ()
       QwtDoubleInterval inverted () const
       bool isNull () const
       bool isValid () const
       QwtDoubleInterval limited (double minValue, double maxValue) const
       double maxValue () const
       double minValue () const
       QwtDoubleInterval normalized () const
       int operator!= (const QwtDoubleInterval &) const
       QwtDoubleInterval operator& (const QwtDoubleInterval &) const
       QwtDoubleInterval & operator&= (const QwtDoubleInterval &)
       int operator== (const QwtDoubleInterval &) const
       QwtDoubleInterval operator| (double) const
       QwtDoubleInterval operator| (const QwtDoubleInterval &) const
       QwtDoubleInterval & operator|= (double)
       QwtDoubleInterval & operator|= (const QwtDoubleInterval &)
       QwtDoubleInterval (double minValue, double maxValue, int borderFlags=IncludeBorders)
       QwtDoubleInterval ()
       void setBorderFlags (int)
       void setInterval (double minValue, double maxValue, int borderFlags=IncludeBorders)
       void setMaxValue (double)
       void setMinValue (double)
       QwtDoubleInterval symmetrize (double value) const
       QwtDoubleInterval unite (const QwtDoubleInterval &) const
       double width () const

Detailed Description
       A class representing an interval.

       The interval is represented by 2 doubles, the lower and the upper limit.

Member Enumeration Documentation
   enum QwtDoubleInterval::BorderMode Flag indicating if a border is included/excluded from an interval
       o IncludeBorders
	  min/max values are inside the interval

       o ExcludeMinimum
	  min value is not included in the interval

       o ExcludeMaximum
	  max value is not included in the interval

       o ExcludeBorders
	  min/max values are not included in the interval

       See also:
	   setBorderMode(), testBorderMode()

Constructor &; Destructor Documentation
   QwtDoubleInterval::QwtDoubleInterval () [inline]
       Default Constructor. Creates an invalid interval [0.0, -1.0]

       See also:
	   setInterval(), isValid()

   QwtDoubleInterval::QwtDoubleInterval (doubleminValue, doublemaxValue, intborderFlags = IncludeBorders) [inline] Constructor
       Build an interval with from min/max values

       Parameters:
	   minValue Minimum value
	   maxValue Maximum value
	   borderFlags Include/Exclude borders

Member Function Documentation
   int QwtDoubleInterval::borderFlags () const [inline] Returns:
	   Border flags

       See also:
	   setBorderFlags()

   bool QwtDoubleInterval::contains (doublevalue) const Test if a value is inside an interval
       Parameters:
	   value Value

       Returns:
	   true, if value >= minValue() && value <= maxValue()

   QwtDoubleInterval QwtDoubleInterval::extend (doublevalue) const Extend the interval
       If value is below minValue, value becomes the lower limit. If value is above maxValue, value becomes the upper limit.

       extend has no effect for invalid intervals

       Parameters:
	   value Value

       See also:
	   isValid()

   QwtDoubleInterval QwtDoubleInterval::intersect (const QwtDoubleInterval &other) const
       Intersect 2 intervals.

   bool QwtDoubleInterval::intersects (const QwtDoubleInterval &other) const Test if two intervals overlap
   void QwtDoubleInterval::invalidate () [inline] Invalidate the interval
       The limits are set to interval [0.0, -1.0]

       See also:
	   isValid()

   QwtDoubleInterval QwtDoubleInterval::inverted () const Invert the limits of the interval
       Returns:
	   Inverted interval

       See also:
	   normalized()

   bool QwtDoubleInterval::isNull () const [inline] Returns:
	   true, if isValid() && (minValue() >= maxValue())

   bool QwtDoubleInterval::isValid () const [inline] A interval is valid when minValue() <= maxValue(). In case of
       QwtDoubleInterval::ExcludeBorders it is true when minValue() < maxValue()
   QwtDoubleInterval QwtDoubleInterval::limited (doublelowerBound, doubleupperBound) const Limit the interval, keeping the border modes
       Parameters:
	   lowerBound Lower limit
	   upperBound Upper limit

       Returns:
	   Limited interval

   double QwtDoubleInterval::maxValue () const [inline] Returns:
	   Upper limit of the interval

   double QwtDoubleInterval::minValue () const [inline] Returns:
	   Lower limit of the interval

   QwtDoubleInterval QwtDoubleInterval::normalized () const
       Normalize the limits of the interval. If maxValue() < minValue() the limits will be inverted.

       Returns:
	   Normalized interval

       See also:
	   isValid(), inverted()

   int QwtDoubleInterval::operator!= (const QwtDoubleInterval &other) const [inline]
       Compare two intervals.

   QwtDoubleInterval QwtDoubleInterval::operator& (const QwtDoubleInterval &interval) const [inline] Intersection of two intervals
       See also:
	   intersect()

   QwtDoubleInterval & QwtDoubleInterval::operator&= (const QwtDoubleInterval &interval)
       Intersects this interval with the given interval.

   int QwtDoubleInterval::operator== (const QwtDoubleInterval &other) const [inline]
       Compare two intervals.

   QwtDoubleInterval QwtDoubleInterval::operator| (const QwtDoubleInterval &interval) const [inline] Union of two intervals
       See also:
	   unite()

   QwtDoubleInterval QwtDoubleInterval::operator| (doublevalue) const [inline] Extend an interval
       See also:
	   extend()

   QwtDoubleInterval & QwtDoubleInterval::operator|= (const QwtDoubleInterval &interval)
       Unites this interval with the given interval.

   void QwtDoubleInterval::setBorderFlags (intborderFlags) [inline] Change the border flags
       Parameters:
	   borderFlags Or'd BorderMode flags

       See also:
	   borderFlags()

   void QwtDoubleInterval::setInterval (doubleminValue, doublemaxValue, intborderFlags = IncludeBorders) [inline] Assign the limits of the
       interval
       Parameters:
	   minValue Minimum value
	   maxValue Maximum value
	   borderFlags Include/Exclude borders

   void QwtDoubleInterval::setMaxValue (doublemaxValue) [inline] Assign the upper limit of the interval
       Parameters:
	   maxValue Maximum value

   void QwtDoubleInterval::setMinValue (doubleminValue) [inline] Assign the lower limit of the interval
       Parameters:
	   minValue Minimum value

   QwtDoubleInterval QwtDoubleInterval::symmetrize (doublevalue) const Adjust the limit that is closer to value, so that value becomes the center
       of the interval.
       Parameters:
	   value Center

       Returns:
	   Interval with value as center

   QwtDoubleInterval QwtDoubleInterval::unite (const QwtDoubleInterval &other) const
       Unite 2 intervals.

   double QwtDoubleInterval::width () const [inline] Return the width of an interval The width of invalid intervals is 0.0, otherwise the result
       is maxValue() - minValue().
       See also:
	   isValid()

Author
       Generated automatically by Doxygen for Qwt User's Guide from the source code.

Version 5.2.2							  Mon Aug 1 2011					      QwtDoubleInterval(3)
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