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Posted 06-18-2020 08:31 AM
(1558 views)

Hi all,

I am building a formula which shows below by referring Sum a series in SAS

When I run,

```
start Sumcon(n);
i = 1:n; /* index of terms */
return( sum((deltak/k[i]##2)#exp(r[i]#T[i])#Q[i]) ); /* sum of terms */
finish;
n = T(1:68);
sum = j(nrow(n),1); /* allocate a vector for the results */
do k = 1 to nrow(n);
sum[k] = Sumcon( n[k] );
end;
```

It returns ERROR: (execution) Matrix has not been set to a value.

where the variables k, r, t, Q are all (68,1) vectors, the deltak is a fixed value 5.

How can I achieve this formula?

Thanks a lot.

1 ACCEPTED SOLUTION

Accepted Solutions

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Here is how I would compute the sum. I am using 5-dimensional vectors instead of 68 elements:

```
proc iml;
/* Use n = 5 instead of 68.
Make up some fake values for the column vectors k, r, t, Q */
k = {1,2,3,4,5};
r = {1,2,3,4,5} / 5;
T = {1,2,3,4,5} / 10;
Q = {1,2,3,4,5} / 15;
deltak = 2;
v = deltak/k##2 # exp(r#T)#Q;
sum = sum(v);
```

7 REPLIES 7

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ERROR: (execution) Matrix has not been set to a value.

Print out each of the matrices involved and see which one(s) do not have values.

--

Paige Miller

Paige Miller

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Thanks for replying. However, every column is valued. Is it caused by incorrect use of the sum function?

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Here is how I would compute the sum. I am using 5-dimensional vectors instead of 68 elements:

```
proc iml;
/* Use n = 5 instead of 68.
Make up some fake values for the column vectors k, r, t, Q */
k = {1,2,3,4,5};
r = {1,2,3,4,5} / 5;
T = {1,2,3,4,5} / 10;
Q = {1,2,3,4,5} / 15;
deltak = 2;
v = deltak/k##2 # exp(r#T)#Q;
sum = sum(v);
```

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Why r, t, Q should divide by 5, 10, 15 respectively? how can I express this when read all var?

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The comment in my program says "Make up some fake values for the column vectors k, r, t, Q"

Thus, these are fake values. Not real. Made up. Use your values instead.

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