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sfan1-Visitor
1-Visitor
Mar 22, 2015 3:09 AM UTC
Solved

Extract non-consecutive rows and columns from a matrix

Hi, everyone,

Suppose I have a 13 by 13 matrix, (shown in attachment),

what I want to do is to extract its 4th-5th, 7th, 9th-10th rows and columns to create a 5 by 5 matrix.

So far I only know that the function "submatrix" works with extracting consecutive rows and columns,

so how to extract non consecutive rows and columns?

Looking forward to hearing from you,

Thank you very much

Best

Shawn

ValeryOchkovAnswer
24-Ruby IV
Mar 22, 2015 8:27 AM UTC

submatrix at first and than stack function!

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3 replies

ValeryOchkov24-Ruby IVAnswer
24-Ruby IV
Mar 22, 2015 8:27 AM UTC

submatrix at first and than stack function!

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StuartBruff23-Emerald V
23-Emerald V
Mar 22, 2015 9:06 AM UTC

... Columns first then rows is probably the way to do it.

Although with so few elements, it might be just as convenient to use a program to loop over the desired row and columns and build up the new matrix one element at a a time.

Stuart

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RichardJ19-Tanzanite
19-Tanzanite
Mar 22, 2015 5:53 PM UTC

I would the column operator with the augment function, followed by the row operator with the stack function.

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