Turn on suggestions

Auto-suggest helps you quickly narrow down your search results by suggesting possible matches as you type.

Showing results for

Options

- RSS Feed
- Mark Topic as New
- Mark Topic as Read
- Float this Topic for Current User
- Bookmark
- Subscribe
- Mute
- Printer Friendly Page

🔒 This topic is **solved** and **locked**.
Need further help from the community? Please
sign in and ask a **new** question.

- Mark as New
- Bookmark
- Subscribe
- Mute
- RSS Feed
- Permalink
- Report Inappropriate Content

Posted 03-06-2018 04:05 PM
(679 views)

Hi,

Suppose I have the following code:

```
proc iml;
class_1 ={1 0 2,
2 3 2};
class_2 ={4 2 3,
2 6 2};
div ={1 2 4,
6 8 10};
new_1 = class_1 / div;
new_2 = class_2 / div;
print new_1;
print new_2;
```

I want to set up a loop to reduce the code. So something like

```
do i = 1 to 2;
new_i = class_i / div;
print new_i;
end;
```

What's the proper way to extract the value of i and use it as an actual value?

Thank you.

1 ACCEPTED SOLUTION

Accepted Solutions

- Mark as New
- Bookmark
- Subscribe
- Mute
- RSS Feed
- Permalink
- Report Inappropriate Content

For your example in which all variables are the same size, I recommend "flattening" the data into row vectors and storing the matrices as rows in a matrix. For your example, it would look like this:

```
nr = 2; /* number of rows */
nc = 3; /* number of cols */
nMatrices = 2; /* total number of matrices being stored */
class = {
1 0 2 2 3 2, /* first 2x3 matrix */
4 2 3 2 6 2}; /* second 2x3 matrix */
div ={1 2 4 6 8 10};
new = class / div;
/* if you need to print or use as matrices, use SHAPE: */
do i = 1 to nMatrices;
newM = shape(new, nr, nc);
print newM;
end;
```

Although I don't recommend it, if you insist on using symbols that have numerical suffixes, you can use the VALUE and VALSET functions.

```
do i = 1 to 2;
cName = "class_" + strip(char(i));
c = value(cName); /* get value of class_i */
new = c / div;
print new;
/* if necessary, use VALSET to create new_i */
end;
```

1 REPLY 1

- Mark as New
- Bookmark
- Subscribe
- Mute
- RSS Feed
- Permalink
- Report Inappropriate Content

For your example in which all variables are the same size, I recommend "flattening" the data into row vectors and storing the matrices as rows in a matrix. For your example, it would look like this:

```
nr = 2; /* number of rows */
nc = 3; /* number of cols */
nMatrices = 2; /* total number of matrices being stored */
class = {
1 0 2 2 3 2, /* first 2x3 matrix */
4 2 3 2 6 2}; /* second 2x3 matrix */
div ={1 2 4 6 8 10};
new = class / div;
/* if you need to print or use as matrices, use SHAPE: */
do i = 1 to nMatrices;
newM = shape(new, nr, nc);
print newM;
end;
```

Although I don't recommend it, if you insist on using symbols that have numerical suffixes, you can use the VALUE and VALSET functions.

```
do i = 1 to 2;
cName = "class_" + strip(char(i));
c = value(cName); /* get value of class_i */
new = c / div;
print new;
/* if necessary, use VALSET to create new_i */
end;
```

Registration is open! SAS is returning to Vegas for an AI and analytics experience like no other! Whether you're an executive, manager, end user or SAS partner, SAS Innovate is designed for everyone on your team. Register for just $495 by 12/31/2023.

**If you are interested in speaking, there is still time to submit a session idea. More details are posted on the website. **

Multiple Linear Regression in SAS

Learn how to run multiple linear regression models with and without interactions, presented by SAS user Alex Chaplin.

Find more tutorials on the SAS Users YouTube channel.