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Top Forums UNIX for Dummies Questions & Answers Grep certain lines with condition Post 302803549 by MadeInGermany on Tuesday 7th of May 2013 04:28:26 AM
Old 05-07-2013
Code:
awk -F, '!($1 in max) || $2>max[$1] {max[$1]=$2} END {for (i in max) print i FS max[i]}' input

Before reaching the END you don't know what the maximum is, hence cannot immediately print anything - a simple grep cannot work.

Last edited by MadeInGermany; 05-07-2013 at 05:55 AM..
 

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mlib_VectorMaximumMag_U8C(3MLIB)			    mediaLib Library Functions				  mlib_VectorMaximumMag_U8C(3MLIB)

NAME
mlib_VectorMaximumMag_U8C, mlib_VectorMaximumMag_S8C, mlib_VectorMaximumMag_S16C, mlib_VectorMaximumMag_S32C, mlib_VectorMaximumMag_F32C, mlib_VectorMaximumMag_D64C - find the first element with the maximum magnitude in a vector SYNOPSIS
cc [ flag... ] file... -lmlib [ library... ] #include <mlib.h> mlib_status mlib_VectorMaximumMag_U8C(mlib_u8 *max, const mlib_u8 *x, mlib_s32 n); mlib_status mlib_VectorMaximumMag_S8C(mlib_s8 *max, const mlib_s8 *x, mlib_s32 n); mlib_status mlib_VectorMaximumMag_S16C(mlib_s16 *max, const mlib_s16 *x, mlib_s32 n); mlib_status mlib_VectorMaximumMag_S32C(mlib_s32 *max, const mlib_s32 *x, mlib_s32 n); mlib_status mlib_VectorMaximumMag_F32C(mlib_f32 *max, const mlib_f32 *x, mlib_s32 n); mlib_status mlib_VectorMaximumMag_D64C(mlib_d64 *max, const mlib_d64 *x, mlib_s32 n); DESCRIPTION
Each of these functions finds the first element with the maximum magnitude in a complex vector, then puts the real and imaginary parts of it into max[0] and max[1], respectively. PARAMETERS
Each of the functions takes the following arguments: max Pointer to the first element with the maximum magnitude. x Pointer to the first element of the source vector. n Number of elements in the source vector. RETURN VALUES
Each of the functions 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_VectorMinimumMag_U8C(3MLIB), mlib_MatrixMaximumMag_U8C(3MLIB), mlib_MatrixMinimumMag_U8C(3MLIB), attributes(5) SunOS 5.10 9 Nov 2004 mlib_VectorMaximumMag_U8C(3MLIB)
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