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Full Discussion: Assign value to variable
Top Forums UNIX for Beginners Questions & Answers Assign value to variable Post 303037545 by bakunin on Monday 5th of August 2019 09:30:15 AM
Old 08-05-2019
Quote:
Originally Posted by MadeInGermany
Code:
sed -n 's/Rows: //p'

If you want to make sure there is only one value printed (like a implicit |uniq) you need to quit after the first match:

Code:
sed -n '/^Rows:/ {;s/^Rows:[^0-9]*\([0-9][0-9]*\).*/\1/p;q;}'

This will print the first line starting with "Rows:" and leave sed after printing it. I have tried to improve the regexp so that (variable numbers of) blanks before and behind the number eventually get deleted too.

I hope this helps.

bakunin
This User Gave Thanks to bakunin For This Post:
 

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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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