Re: [Pharo-dev] About Matrix API access
stepharo wrote ... | matrix23 | matrix23 := Matrix rows: 3 columns: 2. matrix23 at: 1 at: 1 put: 11. What? #at:at:put:? That *will* cause errors. The ats are effectively anonymous keywords. I hope the API can still be changed. e.g. #atRow:column:put: and possibly also #atColumn:row:put:. Thaks, Richard -- View this message in context: http://forum.world.st/About-Matrix-API-access-tp4805746p4806237.html Sent from the Pharo Smalltalk Developers mailing list archive at Nabble.com.
[Pharo-dev] About Matrix API access
Hi I'm wondering why | matrix23 | matrix23 := Matrix rows: 3 columns: 2. matrix23 at: 1 at: 1 put: 11. matrix23 at: 1 at: 2 put: 12. matrix23 at: 1 at: 3 put: 13. matrix23 at: 2 at: 1 put: 21. matrix23 at: 2 at: 2 put: 22. matrix23 at: 2 at: 3 put: 23. is not equivalent to | matrix23 | matrix23 := Matrix rows: 3 columns: 2. matrix23 atColumn: 1 atRow: 1 put: 11. matrix23 atColumn: 1 atRow: 2 put: 12. matrix23 atColumn: 1 atRow: 3 put: 13. matrix23 atColumn: 2 atRow: 1 put: 21. matrix23 atColumn: 2 atRow: 2 put: 22. ^ matrix23 atColumn: 2 atRow: 3 put: 23 I always thought that math notation was x,y (row,colum) How is it done in other languages? I checked the implementation so I know but why this choice in the API.
Re: [Pharo-dev] About Matrix API access
this is correct | matrix23 | matrix23 := Matrix rows: 3 columns: 2. matrix23 at: 1 at: 1 put: 11. is equivalent to | matrix23 | matrix23 := Matrix rows: 3 columns: 2. matrix23 at: 1 atRow: 1 putColumn: 11. In ruby [i,j] Returns element (i,j) of the matrix. That is: row i, column j. This is strange that we cannot map i to x and j to y position and that i is in fact mapped to y Hi I'm wondering why | matrix23 | matrix23 := Matrix rows: 3 columns: 2. matrix23 at: 1 at: 1 put: 11. matrix23 at: 1 at: 2 put: 12. matrix23 at: 1 at: 3 put: 13. matrix23 at: 2 at: 1 put: 21. matrix23 at: 2 at: 2 put: 22. matrix23 at: 2 at: 3 put: 23. is not equivalent to | matrix23 | matrix23 := Matrix rows: 3 columns: 2. matrix23 atColumn: 1 atRow: 1 put: 11. matrix23 atColumn: 1 atRow: 2 put: 12. matrix23 atColumn: 1 atRow: 3 put: 13. matrix23 atColumn: 2 atRow: 1 put: 21. matrix23 atColumn: 2 atRow: 2 put: 22. ^ matrix23 atColumn: 2 atRow: 3 put: 23 I always thought that math notation was x,y (row,colum) How is it done in other languages? I checked the implementation so I know but why this choice in the API.
Re: [Pharo-dev] About Matrix API access
Le 15/2/15 11:23, Sven Van Caekenberghe a écrit : http://en.wikipedia.org/wiki/Matrix_(mathematics) ? yes Since i, j, are the nearly the same for me, as well as row and columns I always got to be really concentrated during my math exam :) Stef On 15 Feb 2015, at 11:13, stepharo steph...@free.fr wrote: Hi I'm wondering why | matrix23 | matrix23 := Matrix rows: 3 columns: 2. matrix23 at: 1 at: 1 put: 11. matrix23 at: 1 at: 2 put: 12. matrix23 at: 1 at: 3 put: 13. matrix23 at: 2 at: 1 put: 21. matrix23 at: 2 at: 2 put: 22. matrix23 at: 2 at: 3 put: 23. is not equivalent to | matrix23 | matrix23 := Matrix rows: 3 columns: 2. matrix23 atColumn: 1 atRow: 1 put: 11. matrix23 atColumn: 1 atRow: 2 put: 12. matrix23 atColumn: 1 atRow: 3 put: 13. matrix23 atColumn: 2 atRow: 1 put: 21. matrix23 atColumn: 2 atRow: 2 put: 22. ^ matrix23 atColumn: 2 atRow: 3 put: 23 I always thought that math notation was x,y (row,colum) How is it done in other languages? I checked the implementation so I know but why this choice in the API.
Re: [Pharo-dev] About Matrix API access
http://en.wikipedia.org/wiki/Matrix_(mathematics) ? On 15 Feb 2015, at 11:13, stepharo steph...@free.fr wrote: Hi I'm wondering why | matrix23 | matrix23 := Matrix rows: 3 columns: 2. matrix23 at: 1 at: 1 put: 11. matrix23 at: 1 at: 2 put: 12. matrix23 at: 1 at: 3 put: 13. matrix23 at: 2 at: 1 put: 21. matrix23 at: 2 at: 2 put: 22. matrix23 at: 2 at: 3 put: 23. is not equivalent to | matrix23 | matrix23 := Matrix rows: 3 columns: 2. matrix23 atColumn: 1 atRow: 1 put: 11. matrix23 atColumn: 1 atRow: 2 put: 12. matrix23 atColumn: 1 atRow: 3 put: 13. matrix23 atColumn: 2 atRow: 1 put: 21. matrix23 atColumn: 2 atRow: 2 put: 22. ^ matrix23 atColumn: 2 atRow: 3 put: 23 I always thought that math notation was x,y (row,colum) How is it done in other languages? I checked the implementation so I know but why this choice in the API.
