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Werner_E25-Diamond I
25-Diamond I
June 15, 2014
Question

Issue with error() function

  • June 15, 2014
  • 2 replies
  • 3041 views

Does anybody know if there is a documentation of the error function telling why some strings lead to strange behaviour?

The effect can be confirmed not only in MC15 but back in Mathcad 11, too - the errormessages are slightly different, though.

Its annyoing - ever so often I am not allowed to add pictures to the post. The insert image window would open but never completes showing its full contenet - no buttons, etc.

So I only attach the files and maybe I am able to edit that post later adding a pic.

error_issue.png

Now inserting the image seemed to have worked.

BTW, ever so often I see "currently being moderated" flashing at the upper left of my messages. Anybody any information about the moderation done here? I ever so often reply to a thread and after I sent my post I see some other answers which, according to the time stamp, should have been there when I first looked at the thread but they weren't. Time delay as of moderation?

2 replies

M
MikeArmstrong1-Visitor
1-Visitor
June 16, 2014

Werner Exinger wrote:

Does anybody know if there is a documentation of the error function telling why some strings lead to strange behaviour?

The effect can be confirmed not only in MC15 but back in Mathcad 11, too - the errormessages are slightly different, though.

error_issue.png

I have to admit I have never seen that before, but has to go down a fundamental bug. Have you reported it?

V
VladimirN24-Ruby III
24-Ruby III
June 16, 2014

I corrected your document (added "\n" to end of string). And here is procedure for "error()" built-in function:

Pic_1.png

M
MikeArmstrong1-Visitor
1-Visitor
June 16, 2014

But why has this worked?

P
PhilipOakley1-Visitor
1-Visitor
June 16, 2014

I suspect it's because of an exact match to certain internal short-names linked to the tool tips, so that the user gets to pick up the internal error message support.

I'm not sure where Vladimir picked up the code sample from, and hence which language facilities it's using (much of mathcad uses on the fly evaluation, so can determine the common err-string name issue I suspect is the rooot cause.

--Edit--

Have a look at the developers reference manual (on the Help menu, 3rd item :V15), and then look for the descriptions about "CreateUserErrorMessageTable" and "Creating Mathcad-Readable Function Libraries" - What isn't covered (as far as I can see) is how the tool-tips are generated which, as you see, can be different from the error strings.


As you can see there, the error messages are referenced by number, and there are functions to add new messages. So I suspect, as above, that duplicates are avoided, so you get the prior entry's results, and tool tips (which can't be set via those functions).

The error() function has three parts:

  1. create the red warning aspect
  2. produce a tool tip reponse
  3. write out the user defined string (the extra bit of the exposed functio)

Try typing 1/0= to see the first two in action for an internal error. The problem is then finding their short string variants (e.g. those you have discovered). I suspect that with internationalisation (i18n) and localisation (l10n) that the strings are now another layer of dereference, so even further disconnected.

Philip

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