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Dear all, Thanks for your great help!! In this sample, when I iterate to find θ, I have no problem at the first time.  test.sm (29kb) downloaded 19 time(s).Then, when I want to calculate SM matrix, something goes wrong: - Do you know what is the problem? - The expression to find θ and SM is the same. Could I use only one expression to calculate these 2 variables? Then, if y change Cm coefficients in order to find a new θ value, the expression don't work, - I'm lost Some feedback?? Thanks in advance!
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Originally Posted by: Pablo001  Dear all,
Then, when I want to calculate SM matrix, something goes wrong:
- Do you know what is the problem?
- The expression to find θ and SM is the same. Could I use only one expression to calculate these 2 variables?
Hi. Actually I can't find why your code don't works, it looks fine to me. But, some problem have, because the error message. About to use only one expression for both, I guess that this is the solution:  Hope this helps. Best regards. Alvaro.
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Joined: 30/03/2020(UTC) Posts: 31  Location: KU Was thanked: 3 time(s) in 2 post(s)
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Originally Posted by: Pablo001 Dear all,
Then, if y change Cm coefficients in order to find a new θ value, the expression don't work,
- I'm lost
Your first calulation block return theta AND assin it to theta - if your block has finished you have calculated matrizes theta, MM, SM it is not necessary to assin theta again I think you made a endless loop in the 2. block make assinments to theta and SM return SM and assign it to itself. Removing the assinment of the blocks. BTW. what is the difference in calculation SM in 2. block to the one in 1. block? seems to me SM is ident in both cases From Newby to Newby ;-) Start Debugger 1. mark code line 2. set breakpoint 3. start debugger F11 4. continue to breakpoint 5. copy to empty page (better to a 2. instance runing) to examine what you have  Edited by user 01 May 2020 13:27:59(UTC)
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 2 users thanked hawe for this useful post.
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on 01/05/2020(UTC), on 01/05/2020(UTC)
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 Rank: Advanced Member Groups: Registered, Advanced Member Joined: 13/01/2012(UTC) Posts: 2,648   Location: Italy Was thanked: 1331 time(s) in 876 post(s)
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The error happens because inside the SM procedure (it's a procedure when line is used on the RHS of a variable) you are trying to assign a matrix element to an existing scalar (Θ, defined in the procedure right above). To avoid it, you should initialize the nested variables before using them, f.e. using or If the existing variable θ was already a matrix, you would have ended overwriting the original values without warnings. This is a powerful feature of the program but if you are not aware of it you might end with some crazy results. In general when you are inside a function or a procedure it's a good practice to always initialize the variables that are meant to be "local"; if you want to inherit a variable and change his value(s) only locally you have to assign it to a local variable. Obviously it can be avoided, if you are aware of the behaviors and you are sure there won't be any accidental inheritance/interference in the worksheet, like for small examples and such. Edited by user 01 May 2020 15:00:33(UTC)
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Originally Posted by: Pablo001 Then, if y change Cm coefficients in order to find a new θ value, the expression don't work,
- I'm lost Best never used the consumed variables Your 3 data sets from doctored ? test (4 try this).sm (37kb) downloaded 14 time(s).
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Joined: 23/01/2014(UTC) Posts: 5
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Hi, Thanks everyone for your help! Understood, it's better to clear the matrix to re-use it. Jean, your file shows black sentences in my computer. 
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Originally Posted by: Pablo001 Jean, your file shows black sentences in my computer. That's the mutual freak between 7251 6179 and vice versa. Select all, background white.
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