Re: [Scilab-users] add number arrays efficiently, how?
Erhy, Your code only works if the input arrays are oriented similiarly (both column or row vectors). For the following input your code would not run: SumArr = [ 1 2 3 ]; toAdd = [ 7 8 9 10 ]'; SumArr( (length(SumArr)+1) : (length(SumArr)+length(toAdd)) ) = toAdd; !--error 15 Submatrix incorrectly defined. //You could try: function y=add_b2a(a, b) [mx,k]=max(size(a)); if k==1 then y= [a(:); b(:)]; else y= [a(:); b(:)]'; end endfunction // Examples: SumArr = [ 1 2 3 ]; toAdd = [ 7 8 9 10 ]'; add_b2a(SumArr, toAdd) ans = 1.2.3.7.8.9.10. SumArr = [ 1 2 3]'; toAdd = [ 7 8 9 10 ]; add_b2a(SumArr, toAdd) ans = 1. 2. 3. 7. 8. 9. 10. Regards, Rafael -- View this message in context: http://mailinglists.scilab.org/add-number-arrays-efficiently-how-tp4035946p4035976.html Sent from the Scilab users - Mailing Lists Archives mailing list archive at Nabble.com. ___ users mailing list users@lists.scilab.org http://lists.scilab.org/mailman/listinfo/users
Re: [Scilab-users] add number arrays efficiently, how?
PabloF wrote > May be im missing something, but i think in both cases you need to know > the arrays in advance, dont you? > > Also, i think SumArr = [SumArr toAdd] has better performance... > Perhaps im not understanding the question.. Perhaps merge arrays would be a appropriate subject. If I code, I'm always uncertain about the orientation of the created array. My first alternative works in any case. -- View this message in context: http://mailinglists.scilab.org/add-number-arrays-efficiently-how-tp4035946p4035974.html Sent from the Scilab users - Mailing Lists Archives mailing list archive at Nabble.com. ___ users mailing list users@lists.scilab.org http://lists.scilab.org/mailman/listinfo/users
Re: [Scilab-users] add number arrays efficiently, how?
Le 23/03/2017 à 00:50, Tim Wescott a écrit : On Thu, 2017-03-23 at 00:28 +0100, Samuel Gougeon wrote: Le 22/03/2017 à 23:15, Erhy a écrit : Hello! I'm thinking in arrays - and I write SumArr = [ 1 2 3 ]; toAdd = [ 7 8 9 10 ]; SumArr( (length(SumArr)+1) : (length(SumArr)+length(toAdd)) ) = toAdd; How to code it smarter? SumArr = [SumArr toAdd] If you know them in advance, yes. which is the case: Hello! I'm thinking in arrays - and I write SumArr = [ 1 2 3 ]; toAdd = [ 7 8 9 10 ]; ___ users mailing list users@lists.scilab.org http://lists.scilab.org/mailman/listinfo/users
Re: [Scilab-users] add number arrays efficiently, how?
Hi, I would have also written SumArr = [SumArr toAdd] Why is this answer different to the original? SumArr( (length(SumArr)+1) : (length(SumArr)+length(toAdd)) ) = toAdd; May be im missing something, but i think in both cases you need to know the arrays in advance, dont you? Also, i think SumArr = [SumArr toAdd] has better performance... Perhaps im not understanding the question.. Obtener Outlook para Android<https://aka.ms/ghei36> From: users <users-boun...@lists.scilab.org> on behalf of Tim Wescott <t...@wescottdesign.com> Sent: Wednesday, March 22, 2017 8:50:26 PM To: Users mailing list for Scilab Subject: Re: [Scilab-users] add number arrays efficiently, how? On Thu, 2017-03-23 at 00:28 +0100, Samuel Gougeon wrote: > Le 22/03/2017 à 23:15, Erhy a écrit : > > > > Hello! > > I'm thinking in arrays - and I write > > > > SumArr = [ 1 2 3 ]; toAdd = [ 7 8 9 10 ]; > > SumArr( (length(SumArr)+1) : (length(SumArr)+length(toAdd)) ) = > > toAdd; > > > > How to code it smarter? > SumArr = [SumArr toAdd] > If you know them in advance, yes. My answer was predicated on not knowing "toAdd" at the same time as the 1x3 SumArr. > -- Tim Wescott www.wescottdesign.com<http://www.wescottdesign.com> Control & Communications systems, circuit & software design. Phone: 503.631.7815 Cell: 503.349.8432 ___ users mailing list users@lists.scilab.org http://lists.scilab.org/mailman/listinfo/users ___ users mailing list users@lists.scilab.org http://lists.scilab.org/mailman/listinfo/users
Re: [Scilab-users] add number arrays efficiently, how?
On Thu, 2017-03-23 at 00:28 +0100, Samuel Gougeon wrote: > Le 22/03/2017 à 23:15, Erhy a écrit : > > > > Hello! > > I'm thinking in arrays - and I write > > > > SumArr = [ 1 2 3 ]; toAdd = [ 7 8 9 10 ]; > > SumArr( (length(SumArr)+1) : (length(SumArr)+length(toAdd)) ) = > > toAdd; > > > > How to code it smarter? > SumArr = [SumArr toAdd] > If you know them in advance, yes. My answer was predicated on not knowing "toAdd" at the same time as the 1x3 SumArr. > -- Tim Wescott www.wescottdesign.com Control & Communications systems, circuit & software design. Phone: 503.631.7815 Cell: 503.349.8432 ___ users mailing list users@lists.scilab.org http://lists.scilab.org/mailman/listinfo/users
Re: [Scilab-users] add number arrays efficiently, how?
Le 22/03/2017 à 23:15, Erhy a écrit : Hello! I'm thinking in arrays - and I write SumArr = [ 1 2 3 ]; toAdd = [ 7 8 9 10 ]; SumArr( (length(SumArr)+1) : (length(SumArr)+length(toAdd)) ) = toAdd; How to code it smarter? SumArr = [SumArr toAdd] ___ users mailing list users@lists.scilab.org http://lists.scilab.org/mailman/listinfo/users
Re: [Scilab-users] add number arrays efficiently, how?
On Wed, 2017-03-22 at 15:15 -0700, Erhy wrote: > Hello! > I'm thinking in arrays - and I write > > SumArr = [ 1 2 3 ]; toAdd = [ 7 8 9 10 ]; > SumArr( (length(SumArr)+1) : (length(SumArr)+length(toAdd)) ) = > toAdd; > > How to code it smarter? That's probably the best way to append an array if you can't anticipate ahead of time how big your ending array will be. However, each time you do that Scilab has to allocate space for a bigger array, copy, and destroy the old copy of the array. If you DO know how big your ending array will be, then you can speed things up by creating a zero array of full size, then populating it as you go. I.e., in this case you'd create SumArr to be 1x7, then populate the first three elements, then populate the last four. -- Tim Wescott www.wescottdesign.com Control & Communications systems, circuit & software design. Phone: 503.631.7815 Cell: 503.349.8432 ___ users mailing list users@lists.scilab.org http://lists.scilab.org/mailman/listinfo/users
