augment() and stack()

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augment() and stack()

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omorr		#1 Posted : 14 April 2012 21:09:43(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 Andrey, I wonder if the augment() and stack() could be made to receive a scalar argument in the case of merging vectors and scalars. This is not working at the moment Array dimensions do not match: c:mat(x,y,z,1,3) augment(a,b,c)=#@# stack(a,b,transpose(c))=#@# But this will: c:mat(x,y,z,1,3) a:mat(a,1,1) b:mat(b,1,1) augment(a,b,c)=mat(a,b,x,y,z,1,5) stack(a,b,transpose(c))=mat(a,b,x,y,z,5,1) We had to make "a" and "b" variables as single element vectors. It seems to me a bit redundant. Andrey, could you make that augment() and stack() could have scalars as their arguments as well, in the cases of merging row or column matrices (vectors)? Regards, Radovan
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1 user thanked omorr for this useful post.		on 16/06/2012(UTC)
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Andrey Ivashov		#2 Posted : 17 June 2012 13:21:45(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)		Hello Radovan. I've checked what could be done with stack/augment to fix issues you are mentioned and I've made corrections to your approach: symbolic engine will not either evaluate augment/stack functions or raise an exception if dimensions of the arguments don't match. It will pass these functions to allow numeric engine make a final decision about what is error and what is not. Please see Use case section of the screenshot below for understanding the reasons. Andrey Ivashov attached the following image(s):
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omorr		#3 Posted : 17 June 2012 14:39:58(UTC)
Rank: Administration Groups: Registered, Advanced Member Joined: 23/06/2009(UTC) Posts: 1,740 Was thanked: 318 time(s) in 268 post(s)		Thank you Andrey for this fix Loking forward to the next release Regards, Radovan
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omorr		#4 Posted : 17 June 2012 17:10:19(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 Andrey, SMath 0.95 was just released and I must be annoying about this issue. Therefore, I appologize Just wondering why this could not be possible in v0.95. Why the first element could not be a scalar - it must be a vector. augment(1,mat(2,3,4,1,3))=#@# stack(1,mat(2,3,4,3,1))=#@# Regards, Radovan
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Andrey Ivashov		#5 Posted : 17 June 2012 17:29:19(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)		Ahh yes. The separate logic for this case presented in the program... It's my fault. Will be fixed in the next release.
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omorr		#6 Posted : 17 June 2012 17:40:01(UTC)
Rank: Administration Groups: Registered, Advanced Member Joined: 23/06/2009(UTC) Posts: 1,740 Was thanked: 318 time(s) in 268 post(s)		Thank you Andrey , BTW, in v0.95 this is possible: stack() and augment() with all scalars - very good augment(1,2,3)=mat(1,2,3,1,3) stack(1,2,3)=mat(1,2,3,3,1) Regards, Radovan
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