topic Re: What is this statement trying to do! in SAS/IML Software and Matrix Computations https://communities.sas.com/t5/SAS-IML-Software-and-Matrix/What-is-this-statement-trying-to-do/m-p/93754#M623 <HTML><HEAD></HEAD><BODY><P>Thank you very much.</P></BODY></HTML> Wed, 27 Jun 2012 17:29:18 GMT goliPSU 2012-06-27T17:29:18Z What is this statement trying to do! https://communities.sas.com/t5/SAS-IML-Software-and-Matrix/What-is-this-statement-trying-to-do/m-p/93752#M621 <HTML><HEAD></HEAD><BODY><P>Hello.</P><P></P><P>round(Z[,+]+ y - t(Z[+,]+v+m),.1)</P><P></P><P>I am not familiar with SAS, what [,+], and [+,] will do on Z matrix and what is their difference.</P><P></P><P>Thank you</P></BODY></HTML> Wed, 27 Jun 2012 16:03:53 GMT https://communities.sas.com/t5/SAS-IML-Software-and-Matrix/What-is-this-statement-trying-to-do/m-p/93752#M621 goliPSU 2012-06-27T16:03:53Z Re: What is this statement trying to do! https://communities.sas.com/t5/SAS-IML-Software-and-Matrix/What-is-this-statement-trying-to-do/m-p/93753#M622 <HTML><HEAD></HEAD><BODY><P>Those are subscript reduction operators. They collapse the dimensionality of your matrix and the + tells SAS to do this by summing.</P><P>If you have a matrix Z = {1 2 3, 4 5 6, 7 8 9} then Z[+,] = {(1+4+8) (2+5+8) (3+6+9)} = {12 15 18}, which is a rowvector. Z[,+] = {1+2+3,4+5+6,7+8+9} = {6,15,24}, which is a columnvector.</P><P></P><P>See <A href="http://support.sas.com/documentation/cdl/en/imlug/59656/HTML/default/viewer.htm#workmatrix_sect14.htm" title="http://support.sas.com/documentation/cdl/en/imlug/59656/HTML/default/viewer.htm#workmatrix_sect14.htm">http://support.sas.com/documentation/cdl/en/imlug/59656/HTML/default/viewer.htm#workmatrix_sect14.htm</A> for more info.</P></BODY></HTML> Wed, 27 Jun 2012 17:16:06 GMT https://communities.sas.com/t5/SAS-IML-Software-and-Matrix/What-is-this-statement-trying-to-do/m-p/93753#M622 nicolas_ 2012-06-27T17:16:06Z Re: What is this statement trying to do! https://communities.sas.com/t5/SAS-IML-Software-and-Matrix/What-is-this-statement-trying-to-do/m-p/93754#M623 <HTML><HEAD></HEAD><BODY><P>Thank you very much.</P></BODY></HTML> Wed, 27 Jun 2012 17:29:18 GMT https://communities.sas.com/t5/SAS-IML-Software-and-Matrix/What-is-this-statement-trying-to-do/m-p/93754#M623 goliPSU 2012-06-27T17:29:18Z