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Full Discussion: Average, min and max in file with header, using awk
Top Forums Shell Programming and Scripting Average, min and max in file with header, using awk Post 302771306 by pamu on Wednesday 20th of February 2013 08:49:43 AM
Old 02-20-2013
Code:
$  awk 'NR>1{a+=$NF;
  max=max>$NF?max:$NF;
  min=min>$NF||!min?$NF:min}
  END{print a/(NR-1),max,min}' file

0.0113093 0.01961 0.003118

This User Gave Thanks to pamu For This Post:
kayakj
 

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LEARN ABOUT SUNOS

mlib_imageextrema2_fp

mlib_ImageExtrema2(3MLIB)				    mediaLib Library Functions					 mlib_ImageExtrema2(3MLIB)

NAME

       mlib_ImageExtrema2, mlib_ImageExtrema2_Fp - image extrema

SYNOPSIS

       cc [ flag... ] file... -lmlib [ library... ]
       #include <mlib.h>

       mlib_status  mlib_ImageExtrema2(mlib_s32  *min,	mlib_s32  *max, const mlib_image *img, mlib_s32 xStart, mlib_s32 yStart, mlib_s32 xPeriod,
       mlib_s32 yPeriod);

       mlib_status mlib_ImageExtrema2_Fp(mlib_d64 *min, mlib_d64 *max, const mlib_image *img, mlib_s32 xStart, mlib_s32 yStart, mlib_s32  xPeriod,
       mlib_s32 yPeriod);

DESCRIPTION

       Each of the functions determines the extrema values for each channel in an image, possibly with subsampling.

       It uses the following equation:

       min[i] = MIN{ img[x][y][i] }
       max[i] = MAX{ img[x][y][i] }

       where

       x = xStart + p*xPeriod;	0 <= p < (w - xStart)/xPeriod
       y = yStart + q*yPeriod;	0 <= q < (h - yStart)/yPeriod

PARAMETERS

       Each of the functions takes the following arguments:

       min	       Pointer to minimum vector, where length is the number of channels in the image.	min[i] contains the minimum of channel i.

       max	       Pointer to maximum vector, where length is the number of channels in the image.	max[i] contains the maximum of channel i.

       img	       Pointer to a source image.

       xStart	       Initial X sample coordinate.

       yStart	       Initial Y sample coordinate.

       xPeriod		X sample rate.	xPeriod >= 1.

       yPeriod		Y sample rate.	yPeriod >= 1.

RETURN VALUES

       The function returns MLIB_SUCCESS if successful. Otherwise it returns MLIB_FAILURE.

ATTRIBUTES

       See attributes(5) for descriptions of the following attributes:

       +-----------------------------+-----------------------------+
       |      ATTRIBUTE TYPE	     |	    ATTRIBUTE VALUE	   |
       +-----------------------------+-----------------------------+
       |Interface Stability	     |Evolving			   |
       +-----------------------------+-----------------------------+
       |MT-Level		     |MT-Safe			   |
       +-----------------------------+-----------------------------+

SEE ALSO

       mlib_ImageExtremaLocations(3MLIB),   mlib_ImageMaximum(3MLIB),	mlib_ImageMaximum_Fp(3MLIB),   mlib_ImageMinimum(3MLIB),   mlib_ImageMini-
       mum_Fp(3MLIB), attributes(5)

SunOS 5.10							    10 Nov 2004 					 mlib_ImageExtrema2(3MLIB)
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