  Rank: Advanced Member Groups: Registered
Joined: 22/02/2014(UTC)
Posts: 81
Was thanked: 11 time(s) in 10 post(s)
|
 test_Cnd.sm (8kb) downloaded 11 time(s).The strange problem happens during symbolic evaluation of the function Cnd. The expression ii=rows(t) was interpreted in a wrong way. If I replace "ii" with number 2 the worksheet works fine. The result of rows(t) is correct and equal to 2. You can check the behavior changing the condition in "if" operator to 0 or 1. Edited by user 08 March 2022 21:50:08(UTC)
| Reason: Not specified
|
|
|
|
|
|
 Rank: Advanced Member Groups: Registered
Joined: 28/08/2014(UTC) Posts: 1,407  Was thanked: 859 time(s) in 545 post(s)
|
Hi. Notice that the degree of the numerator polynomial is not always equal to the degree of the denominator polynomial. Also the number of rows in rows(tt) for tt=numden(H(z)) is always going to equal two, and is not related to the degree of none of the previous polynomials. I think what you have to do is create separate loops for numerator and denominator, and you can get the degree of the polynomials in this way:  Finally, you can create the loop in the range ii..0 instead of 0..ii and thus avoid having to use reverse(), which the SMath token processor sometimes doesn't like. Best regards. Alvaro.
|
 1 user thanked Razonar for this useful post.
|
|
|
|
Rank: Advanced Member Groups: Registered
Joined: 22/02/2014(UTC)
Posts: 81
Was thanked: 11 time(s) in 10 post(s)
|
Hi Alvaro,
The worksheet is correct, the transfer function presented is from a real working project (digital PFC controller).
If the requested coefficient doesn't exist maple(coeff()) returns 0. I think it is correct behavior.
Sorry, I posted the report in a rush, so it might need more clarification.
The problem is that variable ii has correct value =2, you can check it easily.
If you manually set the loop range [0..2] - the worksheet works, but with the loop range [0..ii] - fails.
I have no reasonable explanation rather than a bug.
|
|
|
|
|
|
Rank: Advanced Member Groups: Registered
Joined: 28/08/2014(UTC) Posts: 1,407 Was thanked: 859 time(s) in 545 post(s)
|
Originally Posted by: tomtit  ... The problem is that variable ii has correct value =2, you can check it easily.
If you manually set the loop range [0..2] - the worksheet works, but with the loop range [0..ii] - fails.
I have no reasonable explanation rather than a bug.
Hi. Yes, same thing here, where SMath cannot evaluate rows(): https://en.smath.com/for...-Analysis.aspx#post69034 Best regards Alvaro.
|
|
|
|
|
|
Forum Jump
You cannot post new topics in this forum.
You cannot reply to topics in this forum.
You cannot delete your posts in this forum.
You cannot edit your posts in this forum.
You cannot create polls in this forum.
You cannot vote in polls in this forum.
