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Hi. There are not try-catch here.  Best regards. Alvaro. Edited by moderator 06 October 2018 16:03:26(UTC)
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Originally Posted by: Razonar  There are not try-catch here. There are not too many applications in this forum. It works numerically ... visit this application. Jean  Image Rotate RGB Copy.sm (350kb) downloaded 15 time(s).
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This seems to be a workaround for the bug.  Length_Try_Catch.sm (9kb) downloaded 9 time(s).Functions like this Length, and equivalents for Rows and Cols are a standard way in Mathcad to check if one works with matrices or scalars, avoiding the use of IsMatrix (absent in SMath at this time), and saving some program steps. Best regards. Alvaro. PD: Try-catch is the name in Maple and others for the SMath try-on error. Edited by user 06 October 2018 15:25:10(UTC)
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Added in the BTS as SS-3568P.S. as for now, if you have custom functions:  |
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Originally Posted by: Davide Carpi Added in the BTS as SS-3568P.S. as for now, if you have custom functions: Hi Davide. Thanks. Best regards. For the plugin and for add as issue. Alvaro
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With this version of IsMatrix you catch the length for symbolic matrices. Also, avoiding the use of strings have some advantages over the simple version, here as IsMat. Length.sm (49kb) downloaded 14 time(s). Best regards. Alvaro
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Described behavior of the try...catch is by design.
In your example length(x) calculated symbolically and does not raise an error. You can check it by calculating length(x) with symbolic optimization.
To have the behavior you want please use eval(lenght(x)) instead.
Best regards.
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Originally Posted by: Andrey Ivashov Described behavior of the try...catch is by design.
Best regards. Hi Andrey. Thanks for the clarification. I guess that the origin of this behavior is from about which is the "default unassigned variable type" in SMath. In maple and mathcad it is a complex number, but in SMath it seems to be a matrix or anything else:  If this is the case, it's correct to return rows, cols and length as an error in numerical evaluations and unevaluated form in symbolic ones. For other side, it seems that if actuate like having something like evalb (maple's eval boolean), forcing the numerical evaluation, as it is showed in the yellow regions, and widely apply in the attached. This behavior is very useful, at least to me, because enable following routines for Length, Rows, Cols, IsMatrix (without using num2str which causes some issues for some applications) and others useful tools, which yield the same result for numeric and symbolic evaluations, making more easy the live to me. Length.sm (62kb) downloaded 18 time(s).Best regards. Alvaro. PD: It seems that in the attached file I change the default font color, but don't know how, neither how to revert it to black.
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Originally Posted by: Razonar Hi Andrey. Thanks for the clarification. I guess that the origin of this behavior is from about which is the "default unassigned variable type" in SMath. In maple and mathcad it is a complex number, but in SMath it seems to be a matrix or anything else Unassigned variables are considered as unknown type; there were problems in the past because they were consider scalar or matrices... I suggest to open a separate correction request here or in the bug tracker to improve behavior of length/rows/cols when a matrix contains unknowns...  Edited by user 01 November 2018 02:47:19(UTC)
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... plenty of things will reflect in "on-error" Maths on_error.sm (16kb) downloaded 13 time(s).
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Hi Davide. Thanks for your answer. Originally Posted by: Davide Carpi
Unassigned variables are considered as unknown type; there were problems in the past because they were consider scalar or matrices...
Good to know. So, the results for rows, length, etc. it's correct. I don't have enough time nor ideas about how to test try...on error function, but guess that it is correcto too. Originally Posted by: Davide Carpi I suggest to open a separate correction request here or in the bug tracker to improve behavior of length/rows/cols when a matrix contains unknowns... Thanks for the suggestion. But don't know what could be more convenient. For instance, maple have evalb (booleans), evalm (matrix, but obsolete in news versions), evalc (complexes) and some others for modify the way that evaluations are done. Also, the eval maple's function is like the "at" function in the Custom Functions plugin. So, maybe instead of modify rows and those functions, could be more practical introduce a second argument for eval, of the type of "complex", or "scalar", or "matrix" or things like this. Or maybe there are some simplify function under development which can handle those cases, or ... I actually don't know enogh for say which is the best path to follow. Best regards. Alvaro.
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Originally Posted by: Andrey Ivashov Described behavior of the try...catch is by design. What should it do that is missing ? Catch errors piecewise in program ? Cheers ... Jean
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