How to calculate the max and Min Values For 24.4±0.015? Options  Email this topic  Watch this topic  Print this topic » Normal Threaded

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cmohanc		#1 Posted : 29 July 2012 09:15:22(UTC)
Rank: Newbie Groups: Registered Joined: 07/03/2012(UTC) Posts: 5 Location: India		I have a data : 24.4±0.015 I want to find out the maximum without having to write a code. How is it possible?
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Ber7		#2 Posted : 29 July 2012 11:09:08(UTC)
Rank: Advanced Member Groups: Registered Joined: 15/07/2010(UTC) Posts: 437 Location: Beer-Sheva Was thanked: 520 time(s) in 288 post(s)		For example, the so- http://smath.info/live/?file=3857 Edited by user 29 July 2012 11:15:40(UTC)  | Reason: Not specified
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jabadu		#3 Posted : 29 July 2012 15:14:23(UTC)
Rank: Advanced Member Groups: Registered Joined: 10/11/2010(UTC) Posts: 37 Location: Germany Was thanked: 1 time(s) in 1 post(s)		Hey, this would be a very elegant way for the analysis of tolerance chains. But there would be a Problem: How can you enter a value of e.g. 25 +0,1/-0,2 or 25 +0/-0,2 ?? Any ideas?
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Davide Carpi		#4 Posted : 29 July 2012 18:16:07(UTC)
Rank: Advanced Member Groups: Registered, Advanced Member Joined: 13/01/2012(UTC) Posts: 2,654 Location: Italy Was thanked: 1340 time(s) in 879 post(s)		Hi, Originally Posted by: jabadu How can you enter a value of e.g. 25 +0,1/-0,2 or 25 +0/-0,2 ?? It's not difficult, just use the multiple values item (type "sys(" or click on the curly bracket in the "functions" right panel) Open in SMath Cloud regards, w3b5urf3r Edited by user 29 July 2012 18:22:57(UTC)  | Reason: Not specified
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1 user thanked Davide Carpi for this useful post.		on 30/07/2012(UTC)
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jabadu		#5 Posted : 30 July 2012 15:01:43(UTC)
Rank: Advanced Member Groups: Registered Joined: 10/11/2010(UTC) Posts: 37 Location: Germany Was thanked: 1 time(s) in 1 post(s)		Thanks w3b5urf3r, but then I have the same question as in the beginning of this thread: how do I get the min / max-value of this result? example (btw how did you enter the preview of the live file in your post?)
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Davide Carpi		#6 Posted : 30 July 2012 15:34:43(UTC)
Rank: Advanced Member Groups: Registered, Advanced Member Joined: 13/01/2012(UTC) Posts: 2,654 Location: Italy Was thanked: 1340 time(s) in 879 post(s)		HI Originally Posted by: jabadu Thanks w3b5urf3r, but then I have the same question as in the beginning of this thread: how do I get the min / max-value of this result? example (btw how did you enter the preview of the live file in your post?) For the max() and min() values use the snippet sys2mat() in the attachment To show the preview click on "Get link..." in the bottom-right corner of Live SMath and copy&paste in your post the 2nd link best regards, w3b5urf3r Edited by user 30 July 2012 15:38:37(UTC)  | Reason: Not specified File Attachment(s): sys2mat.sm (5kb) downloaded 51 time(s). sys2mat_example.sm (12kb) downloaded 49 time(s). Davide Carpi attached the following image(s):
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1 user thanked Davide Carpi for this useful post.		on 17/09/2012(UTC)
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jabadu		#7 Posted : 30 July 2012 17:02:06(UTC)
Rank: Advanced Member Groups: Registered Joined: 10/11/2010(UTC) Posts: 37 Location: Germany Was thanked: 1 time(s) in 1 post(s)		Great - but one problem: I get an error message "mat()-function is not defined" on every term below the line tc:= sys2mat(tc) I use Smath 0.95 build 4594 on linux (same also on version 0.94 on linux). :'(
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omorr		#8 Posted : 30 July 2012 18:37:16(UTC)
Rank: Administration Groups: Registered, Advanced Member Joined: 23/06/2009(UTC) Posts: 1,740 Was thanked: 318 time(s) in 268 post(s)		Hello, Here is a screenshot from Ubuntu 12.04 No errors reported. Regards, Radovan omorr attached the following image(s):
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jabadu		#9 Posted : 31 July 2012 13:04:37(UTC)
Rank: Advanced Member Groups: Registered Joined: 10/11/2010(UTC) Posts: 37 Location: Germany Was thanked: 1 time(s) in 1 post(s)		Hmmm - this looks like it's my computer (running on the older ubuntu 8.04 (server version)) that have this problem. Update is scheduled, let's see how it changes. Another question: Does SMath have something like a median-Funktion (= find the value between two given numbers)? Because the usual production process tries to work in the middle of the tolerance field this value could also be interesting to know in a tolerance chain. Btw, why isn't it possible to transcode a system into a matrix with a build-in function? Or enhance the min/max/lenght/... function to work also with a system and not only with a matrix/vector? Is this not a common problem?
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omorr		#10 Posted : 31 July 2012 14:44:39(UTC)
Rank: Administration Groups: Registered, Advanced Member Joined: 23/06/2009(UTC) Posts: 1,740 Was thanked: 318 time(s) in 268 post(s)		Hello, Originally Posted by: jabadu Hmmm - this looks like it's my computer (running on the older ubuntu 8.04 (server version)) that have this problem. Update is scheduled, let's see how it changes. Try this SMath DEB packages. During the installation, missing dependencies will be reported, if any. Regards, Radovan
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Davide Carpi		#11 Posted : 31 July 2012 15:02:45(UTC)
Rank: Advanced Member Groups: Registered, Advanced Member Joined: 13/01/2012(UTC) Posts: 2,654 Location: Italy Was thanked: 1340 time(s) in 879 post(s)		Hi Originally Posted by: jabadu Another question: Does SMath have something like a median-Funktion (= find the value between two given numbers)? Because the usual production process tries to work in the middle of the tolerance field this value could also be interesting to know in a tolerance chain. You can try with linterp() or building a function like med(A;A+/2 Originally Posted by: jabadu Btw, why isn't it possible to transcode a system into a matrix with a build-in function? Or enhance the min/max/lenght/... function to work also with a system and not only with a matrix/vector? Is this not a common problem? I don't know, it's not yet implemented but SMath is in continuous development and something can escape... I'm sure that in a future version there will be some improvements, specially if you report your Feature Requests... f.e. an improvement of max() and min() is requested from several users (max and min), and the support of systems is something that should be included but it's not reported regards, w3b5urf3r
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Basile		#12 Posted : 31 July 2012 16:17:08(UTC)
Rank: Advanced Member Groups: Registered Joined: 13/10/2010(UTC) Posts: 172 Location: USA Was thanked: 8 time(s) in 7 post(s)		Hello, Why I am getting different answers? (http://www.yourfilelink.com/get.php?fid=816752&dv=1) Thanks, Basile Edited by user 31 July 2012 16:19:33(UTC)  | Reason: Not specified
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Davide Carpi		#13 Posted : 31 July 2012 16:44:27(UTC)
Rank: Advanced Member Groups: Registered, Advanced Member Joined: 13/01/2012(UTC) Posts: 2,654 Location: Italy Was thanked: 1340 time(s) in 879 post(s)		Originally Posted by: Basile Hello, Why I am getting different answers? (http://www.yourfilelink.com/get.php?fid=816752&dv=1) Thanks, Basile yourfilelink.com report: "Incorrect linking code. Please try again." can't you attach the file on your post? w3b5urf3r
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Basile		#14 Posted : 31 July 2012 17:50:24(UTC)
Rank: Advanced Member Groups: Registered Joined: 13/10/2010(UTC) Posts: 172 Location: USA Was thanked: 8 time(s) in 7 post(s)		Here should be... Basile attached the following image(s):
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Davide Carpi		#15 Posted : 31 July 2012 19:14:00(UTC)
Rank: Advanced Member Groups: Registered, Advanced Member Joined: 13/01/2012(UTC) Posts: 2,654 Location: Italy Was thanked: 1340 time(s) in 879 post(s)		Originally Posted by: Basile Here should be... Hi, it's the optimization in the definition of R, R,eq and R,e (see optimization of coloured equations in the attachment) regards, w3b5urf3r Edited by user 31 July 2012 19:19:54(UTC)  | Reason: Not specified File Attachment(s): sys.sm (14kb) downloaded 17 time(s).
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omorr		#16 Posted : 31 July 2012 19:19:38(UTC)
Rank: Administration Groups: Registered, Advanced Member Joined: 23/06/2009(UTC) Posts: 1,740 Was thanked: 318 time(s) in 268 post(s)		Hello, Pay attention how sys() is working. In this simple example, every element from both sys() are combined with each other: sys(1,20,2,1)+sys(50,300,2,1)=sys(51,70,301,320,4,1) Sometimes it behaves differently, it depends on optimization applied. Optimization numeric: sys(1,20,2,1)+sys(1,20,2,1)=sys(2,21,21,40,4,1) Optimization symbolic: sys(1,20,2,1)+sys(1,20,2,1)=2*sys(1,20,2,1) Actually: 2*sys(1,20,2,1)=sys(2,40,2,1) To be honest, because sys() in the calculations can sometimes be quite confusing, my advice is to avoid it in calculations. Actually, I did not figure out yet where the sys() environment is the most useful for using - excluding plots. Regards, Radovan Edited by user 31 July 2012 19:28:40(UTC)  | Reason: Not specified
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Basile		#17 Posted : 31 July 2012 19:42:21(UTC)
Rank: Advanced Member Groups: Registered Joined: 13/10/2010(UTC) Posts: 172 Location: USA Was thanked: 8 time(s) in 7 post(s)		Thank you both for your replies. But how somebody will know a priori to leave the default or change the optimization? Thanks, Basile
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jabadu		#18 Posted : 01 August 2012 18:57:54(UTC)
Rank: Advanced Member Groups: Registered Joined: 10/11/2010(UTC) Posts: 37 Location: Germany Was thanked: 1 time(s) in 1 post(s)		Hello w3b5urf3r, I found the reason why your snippets don't work on my machine. Change the decimal symbol to comma and the arguments separator to semicolon and you get the same errors. With decimal symbol "period" and argument separator "comma" everything is fine. Haven't tested if this is a bug or a feature... Because Andrey is improving the min/max-function in near future these snippets won't be needed any more (probably/hopefully) greetings jabadu
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Davide Carpi		#19 Posted : 02 August 2012 04:26:17(UTC)
Rank: Advanced Member Groups: Registered, Advanced Member Joined: 13/01/2012(UTC) Posts: 2,654 Location: Italy Was thanked: 1340 time(s) in 879 post(s)		Originally Posted by: jabadu Hello w3b5urf3r, I found the reason why your snippets don't work on my machine. Change the decimal symbol to comma and the arguments separator to semicolon and you get the same errors. With decimal symbol "period" and argument separator "comma" everything is fine. Haven't tested if this is a bug or a feature... Because Andrey is improving the min/max-function in near future these snippets won't be needed any more (probably/hopefully) greetings jabadu Thank you very much... seem it's an issue (BUG?) of the built-in functions str2num(#) and num2str(#) that have different behavior changing interface settings (see the attachments) (probably the wrong behavior is in num2str(#) but I'm not sure) regards, w3b5urf3r Edited by user 02 August 2012 04:35:24(UTC)  | Reason: Not specified File Attachment(s): num2str_str2num_bug.sm (6kb) downloaded 13 time(s). Davide Carpi attached the following image(s):
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Andrey Ivashov		#20 Posted : 02 August 2012 21:16:08(UTC)
Rank: Administration Groups: Developers, Registered, Knovel Developers, Administrators, Advanced Member Joined: 11/07/2008(UTC) Posts: 1,616 Was thanked: 1978 time(s) in 666 post(s)		Thank you! Bug of str2num function fixed. Regards.
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1 user thanked Andrey Ivashov for this useful post.		on 02/08/2012(UTC)
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