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From |
Garrett Harmon <garrrett@gmail.com> |

To |
statalist@hsphsun2.harvard.edu |

Subject |
st: Mata pointers for three dimensional matrices |

Date |
Wed, 19 Feb 2014 11:37:36 -0500 |

Hello, In order to create a three dimensional matrix, I have a vector of pointers that point to a working matrix, and I need each pointer to store a different state of that matrix. However, since they are pointers, they just point to the last transformation done to the working matrix. Here's a simple example: mata pointers=J(1,2,NULL) calculation=J(1,5,0) for (a=1; a <= 2; a++) { for (i=1; i<=5; i++) { calculation[1,i]=calculation[ 1,i]+1 } pointers[1,a]=&calculation *pointers[1,a] } *pointers[1,1] end I want *pointers[1,1] to equal [1 1 1 1 1] and *pointers[1,2] to equal [2 2 2 2 2], but after the loop ends they both point to [2 2 2 2 2] which is the final state of the calculation matrix. Any thoughts on how I should be doing it differently? -Garrett * * For searches and help try: * http://www.stata.com/help.cgi?search * http://www.stata.com/support/faqs/resources/statalist-faq/ * http://www.ats.ucla.edu/stat/stata/

**Follow-Ups**:**Re: st: Mata pointers for three dimensional matrices***From:*Matthew Baker <matthew.baker@hunter.cuny.edu>

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