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sfan1-Visitor
1-Visitor
March 22, 2015
Solved

Extract non-consecutive rows and columns from a matrix

  • March 22, 2015
  • 2 replies
  • 1709 views

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

Best answer by ValeryOchkov

submatrix at first and than stack function!

2 replies

V
24-Ruby IV
ValeryOchkov24-Ruby IVAnswer
24-Ruby IV
March 22, 2015

submatrix at first and than stack function!

S
StuartBruff23-Emerald V
23-Emerald V
March 22, 2015

... 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

R
RichardJ19-Tanzanite
19-Tanzanite
March 22, 2015

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

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