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Jan 9, 2014 11:19 AM
(2148 views)

Quick question about extracting a single column from a large matrix into a submatrix. Just as an example below: I want extract the second column from matrix P ( I want to pull out 2,5,8) and place it into a submatrix called A. However when I try to attempt it in this way, I am getting invalid matrix token error.

P=[1 2 3, 4 5 6, 7 8 9];

for(i=1,i<=3,i = i + 1,

A = [P[i,2]];

);

Should be really simple, but for some reason it is stumping me. Thanks for the help!

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Jan 9, 2014 11:45 AM
(3938 views)

Solution

Matt's pointing you in the right direction.

Here's a more specific set of documentation on Subsetting Matrices.

The answer at the end of the book is that a subscript argument of zero selects all rows or columns.

P=**[****1** **2** **3**, **4** **5** **6**, **7** **8** **9****]**;

A=P**[****0**,**2****]**;

-Jeff

-Jeff

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Jan 9, 2014 11:34 AM
(1969 views)

see:

Xan Gregg June 15, 2009

http://www.jmp.com/support/help/Matrix_Functions.shtml

http://blogs.sas.com/content/jmp/2009/06/15/jsl-tip-use-matrices-instead-of-lists/

http://www.jmp.com/support/help/Matrix_Functions.shtmlalso:

http://www.jmp.com/support/help/Matrix_Functions.shtmlp=[1 2 3, 4 5 6, 7 8 9];

A = J(1,3);

for(i=1,i<-=3,i++

A* = P[i,2[;*

);

A

Best regards,

-Matt

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Jan 9, 2014 11:45 AM
(3939 views)

Matt's pointing you in the right direction.

Here's a more specific set of documentation on Subsetting Matrices.

The answer at the end of the book is that a subscript argument of zero selects all rows or columns.

P=**[****1** **2** **3**, **4** **5** **6**, **7** **8** **9****]**;

A=P**[****0**,**2****]**;

-Jeff

-Jeff

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Jan 9, 2014 5:06 PM
(1969 views)