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Full Discussion: Find gaps in time data and replace missing time value and column 2 value by interpolation in awk
Top Forums Programming Find gaps in time data and replace missing time value and column 2 value by interpolation in awk Post 302931885 by RudiC on Friday 16th of January 2015 07:08:40 AM
Old 01-16-2015
Please be aware that your data are not a linear function of time; on top of some noise it has a small curvature, and the six data points right after the gap are somewhat lower than they should be (there's a jump in values but not in time delta at point 7).
This is a quick and dirty approximation to exactly your problem and data; no error checking etc. is done. It's sort of a linear interpolation between the given boundaries although we know the boundary to the right is questionable. On top, my mawk has a problem with the D1 > D0 comparison, sometimes the delta is -1E-16, sometimes it's +71E-16, so a few extra lines are being "interpolated". I don't have a good solution at hand; either increase the to be compared value slightly (yuck!) or use sort -u on the result (yuck!)...
However, try
Code:
awk     'NR==1  {L1=$1; L2=$2; D0=0.05}
                {D1=$1-L1; D2=$2-L2
                 if (D1 > D0)   { n=D1/D0                   # D1 sometimes is sliiightly larger than D0
                                 ST=D2/n
                                 for (i=1; i<=int(n); i++) printf "%7.5f   %6.4f <---\n", L1+D0*i, L2+ST*i}
                 L1=$1; L2=$2
                 print $0}
        ' file

This User Gave Thanks to RudiC For This Post:
malandisa
 

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LEARN ABOUT XFREE86

glupwlcurve

GLUPWLCURVE(3G) 														   GLUPWLCURVE(3G)

NAME

       gluPwlCurve - describe a piecewise linear NURBS trimming curve

C SPECIFICATION

       void gluPwlCurve( GLUnurbs* nurb,
			 GLint count,
			 GLfloat* data,
			 GLint stride,
			 GLenum type )

PARAMETERS

       nurb    Specifies the NURBS object (created with gluNewNurbsRenderer).

       count   Specifies the number of points on the curve.

       data    Specifies an array containing the curve points.

       stride  Specifies the offset (a number of single-precision floating-point values) between points on the curve.

       type    Specifies the type of curve.  Must be either GLU_MAP1_TRIM_2 or GLU_MAP1_TRIM_3.

DESCRIPTION

       gluPwlCurve describes a piecewise linear trimming curve for a NURBS surface.  A piecewise linear curve consists of a list of coordinates of
       points in the parameter space for the NURBS surface to be trimmed. These points are connected with line segments to form a  curve.  If  the
       curve  is an approximation to a curve that is not piecewise linear, the points should be close enough in parameter space that the resulting
       path appears curved at the resolution used in the application.

       If type is GLU_MAP1_TRIM_2, then it describes a curve in two-dimensional (u and v) parameter space.  If	it  is	GLU_MAP1_TRIM_3,  then	it
       describes  a  curve in two-dimensional homogeneous (u, v, and w) parameter space.  See the gluBeginTrim reference page for more information
       about trimming curves.

NOTES

       To describe a trim curve that closely follows the contours of a NURBS surface, call gluNurbsCurve.

SEE ALSO

       gluBeginCurve(3G), gluBeginTrim(3G), gluNewNurbsRenderer(3G), gluNurbsCurve(3G)

																   GLUPWLCURVE(3G)
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