Obsidian | Level 7

## Proc IML - evaluating multiple conditions

I am new to using proc iml and have the following expression that doesn't seem to be working which I believe should be equivalent to 'if-then-else' statements in the data step. The variable 'teventBX' should be assigned a value (either period1/2/3/4/5) based on mutually exclusive conditional expressions.

teventBX = period1#(period1 < p1duration) + period2#((period1 > p1duration) & (1 <= period2 < 2))
+ period3#((period1 > p1duration) & (period2 > (p1duration + p2duration)) & (2 <= period3 < 3))
+ period4#((period1 > p1duration) & (period2 > (p1duration + p2duration)) & (period3 > (p1duration + p2duration + p3duration)) & (3 <= period4 < 4))
+ period5#((period1 > p1duration) & (period2 > (p1duration + p2duration)) & (period3 > (p1duration + p2duration + p3duration)) & (period4 > (p1duration + p2duration + p3duration + p4duration)) & (4 <= period5 < 5))
+ period5#((period1 > p1duration) & (period2 > (p1duration + p2duration)) & (period3 > (p1duration + p2duration + p3duration)) & (period4 > (p1duration + p2duration + p3duration + p4duration)) & (period5 > 5));

A few records in the dataset to help understand the issue. The last column has the correct values that should have been the result of the above code. But, except for the first 2 expressions for period1 and period2, the statement above is just adding up the period values for periods 3-5. For example, in Obs3 below, teventBX = period2 + period3 + period4 + period5. And in Obs4, teventBX = period2 + period3 + period4.

 Obs period1 p1duration period2 p2duration period3 p3duration period4 p4duration period5 p5duration teventBX Correct teventBX 1 1.7561 1 1.2074 1 5.9824 1 10.7529 1 4.6408 1 1.207 1.2074 2 0.6808 1 9.4134 1 7.1525 1 3.6021 1 4.7635 1 0.681 0.6808 3 1.7161 1 33.2933 1 42.1225 1 10.5065 1 4.1977 1 90.1200 4.1977 4 7.5841 1 16.5281 1 11.4061 1 3.8003 1 15.0174 1 31.7345 3.8003 5 10.4676 1 26.2526 1 2.0952 1 13.1565 1 4.8462 1 28.3478 2.0952 6 1.4104 1 4.0418 1 6.8128 1 9.4646 1 4.8171 1 25.1362 4.8171 7 4.2862 1 8.7941 1 2.5706 1 5.3440 1 7.3122 1 11.3647 2.5706 8 1.4407 1 2.1727 1 13.6600 1 37.2924 1 4.4550 1 57.5800 4.4550 9 7.8799 1 3.1210 1 4.2688 1 3.9127 1 11.4282 1 11.3025 3.9127

Any help is appreciated!

1 ACCEPTED SOLUTION

Accepted Solutions
SAS Super FREQ

## Re: Proc IML - evaluating multiple conditions

The expressions

(1 <= period2 <= 2)

and

(2 <= period3 < 3)

are not valid IML expressions. They should be replaced by

(1 <= period2) & (period2 <= 2)

and

(2 <= period3) & (period3 < 3)

To learn more about the BETWEEN operator in the DATA step and why it is not supported in MIL (or R or MATLAB....) see

https://blogs.sas.com/content/iml/2012/02/20/the-data-step-and-the-implied-and-operator.html

2 REPLIES 2
SAS Super FREQ

## Re: Proc IML - evaluating multiple conditions

Hello,

There's a separate board for
SAS/IML Software and Matrix Computations
Statistical programming, matrix languages, and more

I have moved your question to that place.

BR,

Koen

SAS Super FREQ

## Re: Proc IML - evaluating multiple conditions

The expressions

(1 <= period2 <= 2)

and

(2 <= period3 < 3)

are not valid IML expressions. They should be replaced by

(1 <= period2) & (period2 <= 2)

and

(2 <= period3) & (period3 < 3)

To learn more about the BETWEEN operator in the DATA step and why it is not supported in MIL (or R or MATLAB....) see

https://blogs.sas.com/content/iml/2012/02/20/the-data-step-and-the-implied-and-operator.html

From The DO Loop