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Top Forums Shell Programming and Scripting Selecting lines having same values for first two columns Post 302748793 by manojmalhotra13 on Thursday 27th of December 2012 02:01:39 AM
Old 12-27-2012
Selecting lines having same values for first two columns

Hello to all.

This is first post. Kindly excuse me if I do not adhere to any rules and regulations of this forum.

I have a file containing some rows with three columns each per row(separeted by a space). There are certain rows for which first two columns have same value but the value in third column is different. In that case I wish to retain only that row which has the maximum value for third column. Further I want to wirte the rows not required to a file for further processing.

Code:
 
1123022201 9310777627 3976
1127021871 9312262893 3600  -- not required, sent to another file.
1127021871 9312262893 4016  -- to be retained.
1122000518 9350066745 4464
1127455152 7827493958 3600  -- not required, sent to another file.
1127455152 7827493958 5138  -- to be retained.

Kindly help me in this regard.

Thanks in anticipation.

Manoj
 

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MPSMatrixDescriptor(3)					 MetalPerformanceShaders.framework				    MPSMatrixDescriptor(3)

NAME
MPSMatrixDescriptor SYNOPSIS
#import <MPSMatrixTypes.h> Inherits NSObject. Class Methods (__nonnull instancetype) + matrixDescriptorWithDimensions:columns:rowBytes:dataType: (__nonnull instancetype) + matrixDescriptorWithRows:columns:rowBytes:dataType: (__nonnull instancetype) + matrixDescriptorWithRows:columns:matrices:rowBytes:matrixBytes:dataType: (size_t) + rowBytesFromColumns:dataType: (size_t) + rowBytesForColumns:dataType: Properties NSUInteger rows NSUInteger columns NSUInteger matrices MPSDataType dataType NSUInteger rowBytes NSUInteger matrixBytes Detailed Description This depends on Metal.framework A MPSMatrixDescriptor describes the sizes, strides, and data type of a an array of 2-dimensional matrices. All storage is assumed to be in 'matrix-major'. See the description for MPSMatrix for further details. Method Documentation + (__nonnull instancetype) matrixDescriptorWithDimensions: (NSUInteger) rows(NSUInteger) columns(NSUInteger) rowBytes(MPSDataType) dataType Create a MPSMatrixDescriptor with the specified dimensions and data type. Parameters: rows The number of rows of the matrix. columns The number of columns of the matrix. rowBytes The number of bytes between starting elements of consecutive rows. Must be a multiple of the element size. dataType The type of the data to be stored in the matrix. For performance considerations the optimal row stride may not necessarily be equal to the number of columns in the matrix. The MPSMatrix class provides a method which may be used to determine this value, see the rowBytesForColumns API in the MPSMatrix class. The number of matrices described is initialized to 1. + (__nonnull instancetype) matrixDescriptorWithRows: (NSUInteger) rows(NSUInteger) columns(NSUInteger) matrices(NSUInteger) rowBytes(NSUInteger) matrixBytes(MPSDataType) dataType Create a MPSMatrixDescriptor with the specified dimensions and data type. Parameters: rows The number of rows of a single matrix. columns The number of columns of a single matrix. matrices The number of matrices in the MPSMatrix object. rowBytes The number of bytes between starting elements of consecutive rows. Must be a multiple of the element size. matrixBytes The number of bytes between starting elements of consecutive matrices. Must be a multiple of rowBytes. dataType The type of the data to be stored in the matrix. For performance considerations the optimal row stride may not necessarily be equal to the number of columns in the matrix. The MPSMatrix class provides a method which may be used to determine this value, see the rowBytesForColumns API in the MPSMatrix class. + (__nonnull instancetype) matrixDescriptorWithRows: (NSUInteger) rows(NSUInteger) columns(NSUInteger) rowBytes(MPSDataType) dataType + (size_t) rowBytesForColumns: (NSUInteger) columns(MPSDataType) dataType + (size_t) rowBytesFromColumns: (NSUInteger) columns(MPSDataType) dataType Return the recommended row stride, in bytes, for a given number of columns. Parameters: columns The number of columns in the matrix for which the recommended row stride, in bytes, is to be determined. dataType The type of matrix data values. To achieve best performance the optimal stride between rows of a matrix is not necessarily equivalent to the number of columns. This method returns the row stride, in bytes, which gives best performance for a given number of columns. Using this row stride to construct your array is recommended, but not required (provided that the stride used is still large enough to allocate a full row of data). Property Documentation - columns [read], [write], [nonatomic], [assign] The number of columns in a matrix. - dataType [read], [write], [nonatomic], [assign] The type of the data which makes up the values of the matrix. - matrices [read], [nonatomic], [assign] The number of matrices. - matrixBytes [read], [nonatomic], [assign] The stride, in bytes, between corresponding elements of consecutive matrices. Must be a multiple of rowBytes. - rowBytes [read], [write], [nonatomic], [assign] The stride, in bytes, between corresponding elements of consecutive rows. Must be a multiple of the element size. - rows [read], [write], [nonatomic], [assign] The number of rows in a matrix. Author Generated automatically by Doxygen for MetalPerformanceShaders.framework from the source code. Version MetalPerformanceShaders-100 Thu Feb 8 2018 MPSMatrixDescriptor(3)
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