Hi everyone. I have a question regarding multiplying matrices. I already read Interpreting PROC IML error messages: Matrices do not conform to the operation suggested in other boards and I still do not understand why I get this message. I understand that if I want to multiply xbeta = x # beta; the number of columns in X have to be equal to the rows in beta, right? I am running SAS 9.4
This is part of my code:
xbeta = x#beta;
se= sqrt (vecdiag(x#cov#x`));
lower =xbeta - (1.96 # se);
upper =xbeta + (1.96 # se);
When I run the operation I get this on the log:
ERROR: (execution) Matrices do not conform to the operation.
operation : # at line 15164 column 14
operands : X, BETA
X 502 rows 6 cols (numeric)
BETA 6 rows 1 col (numeric)
And also when I try to perform this operation x#cov
operation : # at line 15164 column 80
operands : X, COV
X 502 rows 6 cols (numeric)
COV 6 rows 6 cols (numeric)
What am I doing wrong? Thanks!