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Top Forums Shell Programming and Scripting shell script(Preferably awk or sed) to print selected number of columns from each row Post 302347223 by ks_reddy on Tuesday 25th of August 2009 07:28:23 AM
Old 08-25-2009
shell script(Preferably awk or sed) to print selected number of columns from each row

Hi Experts,

The question may look very silly by seeing the title, but please have a look at it clearly.

I have a text file where the first 5 columns in each row were supposed to be attributes of a sample(like sample name, number, status etc) and the next 25 columns are parameters on which I am interested in looking at.

But the problem is for some of the rows in the text file we don't have all the 5 columns(first 5 fields). Then the parameter column will be left offset by 1 or 2 columns etc depending on the number of missing attribute columns.

So I decided to print the last 25 columns starting from the last column so that for each sample I get my required parameters from which I need make some plots.

I need the script preferable using awk, sed and grep.

Many thanks friends..
 

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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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