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08-08-2017 06:47 AM - edited 08-08-2017 07:00 AM

Is there a way to write the 5th line below so that it works (while keeping it within a single expression / single line) ?

More generally, how can a vector be initiated by specifying formulas instead of values for each element?

```
proc iml;
x = j(3,2,.);
do i = 1 to nrow(x);
/*this doesn't work*/
x[i,] = { i 0 };
/*this does work, but it's an extra line */
x[i,1] = i;
x[i,2] = 0;
end;
quit
```

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Solution

08-08-2017
07:49 AM

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Posted in reply to MDaniel

08-08-2017 07:33 AM

The direct answer to your question is to use the horizontal concatenation operator (||)

x[i,] = i || 0;

as described in the article "How to build a vector from expressions."

Of course, for this example, you don't need a loop at all:

```
proc iml;
x1 = T( 1:3 );
x2 = j(nrow(x1), 1, 0);
x = x1 || x2;
```

All Replies

Solution

08-08-2017
07:49 AM

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Posted in reply to MDaniel

08-08-2017 07:33 AM

The direct answer to your question is to use the horizontal concatenation operator (||)

x[i,] = i || 0;

as described in the article "How to build a vector from expressions."

Of course, for this example, you don't need a loop at all:

```
proc iml;
x1 = T( 1:3 );
x2 = j(nrow(x1), 1, 0);
x = x1 || x2;
```