Gather

6 events

when toggle format	what		by	license	comment
S Sep 23, 2016 at 20:50	history	suggested	LCarvalho	CC BY-SA 3.0	Formatting for better presentation
Sep 23, 2016 at 20:35	review	Suggested edits
S Sep 23, 2016 at 20:50
Feb 23, 2016 at 16:51	comment	added	Steve		Similarly GatherBy[rings[3], Lmag@Coefficient[#1, {q1, q2, q3}] &] gives the output in reversed order? Obviously I could Reverse it, but I need to understand it much more generally for later cases with many more subsets.
Feb 23, 2016 at 16:50	comment	added	Steve		Gather[rings[3], Lmag@Coefficient[#1, {q1, q2, q3}] <= Lmag@Coefficient[#2, {q1, q2, q3}] &] gives almost the correct result, except that the two sets are backwards in that case. You can check things like N@Lmag[{2, -1, 0}] and N@Lmag[{1, 1, -1}] to see that the Gather is collecting the larger "Sqrt[7]-magnitude" elements before the smaller "2-magnitude" elements
Feb 23, 2016 at 16:36	comment	added	Steve		Thank you for the syntax error! Indeed, someone else just found that in the comments a moment ago. I understand that a reader here wouldn't know, but, unfortunately that output is not the desired. The desired output would be a list of two lists. The first list should contain 3 elements which are linear combinations including all 3 qs (like q1-q2+q3). The second list should contain 6 elements which are linear combinations including a prefactor 2 (like -q1+2 q2).
Feb 23, 2016 at 16:34	history	answered	Jack LaVigne	CC BY-SA 3.0