topic Re: SAS IML create matrix using {} with scalar arithmetic. in SAS/IML Software and Matrix Computations

SAS IML create matrix using {} with scalar arithmetic.

kilasue — Sun, 03 Feb 2019 05:43:12 GMT

In IML, following code gives an error:

proc iml;
	i=5;
	theta={i*3,4};
quit;

This code has no error. But it doesn't run as expected:

proc iml;
	i=5;
	j=i*3;
	theta={j,4};
quit;

What's the reason?

I want to create a column with elements {15,4}.

Re: SAS IML create matrix using {} with scalar arithmetic.

PeterClemmensen — Sun, 03 Feb 2019 07:37:21 GMT

No, I don't think the syntax is supported like that. Also, I think the second block of code is much prettier, so why not just go with that?

Re: SAS IML create matrix using {} with scalar arithmetic.

IanWakeling — Sun, 03 Feb 2019 09:04:38 GMT

The reason it runs without error is that IML interprets { j , 4 } as a declaration of a character vector. The easiest way to get what you want is to use a concatenation operator:

theta = j // 4;

Re: SAS IML create matrix using {} with scalar arithmetic.

Rick_SAS — Mon, 04 Feb 2019 13:54:09 GMT

To expand on Ian's answer, see the article "How to build a vector from expressions."