{"action":"created","issue":{"url":"https://api.github.com/repos/gap-system/gap/issues/3114","repository_url":"https://api.github.com/repos/gap-system/gap","labels_url":"https://api.github.com/repos/gap-system/gap/issues/3114/labels{/name}","comments_url":"https://api.github.com/repos/gap-system/gap/issues/3114/comments","events_url":"https://api.github.com/repos/gap-system/gap/issues/3114/events","html_url":"https://github.com/gap-system/gap/issues/3114","id":391677997,"node_id":"MDU6SXNzdWUzOTE2Nzc5OTc=","number":3114,"title":"Error when computing irreducibles of a permutation group","user":{"login":"ThomasBreuer","id":25204833,"node_id":"MDQ6VXNlcjI1MjA0ODMz","avatar_url":"https://avatars3.githubusercontent.com/u/25204833?v=4","gravatar_id":"","url":"https://api.github.com/users/ThomasBreuer","html_url":"https://github.com/ThomasBreuer","followers_url":"https://api.github.com/users/ThomasBreuer/followers","following_url":"https://api.github.com/users/ThomasBreuer/following{/other_user}","gists_url":"https://api.github.com/users/ThomasBreuer/gists{/gist_id}","starred_url":"https://api.github.com/users/ThomasBreuer/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/ThomasBreuer/subscriptions","organizations_url":"https://api.github.com/users/ThomasBreuer/orgs","repos_url":"https://api.github.com/users/ThomasBreuer/repos","events_url":"https://api.github.com/users/ThomasBreuer/events{/privacy}","received_events_url":"https://api.github.com/users/ThomasBreuer/received_events","type":"User","site_admin":false},"labels":[{"id":1053182310,"node_id":"MDU6TGFiZWwxMDUzMTgyMzEw","url":"https://api.github.com/repos/gap-system/gap/labels/backport-to-4.10","name":"backport-to-4.10","color":"f7f3a5","default":false},{"id":300486400,"node_id":"MDU6TGFiZWwzMDA0ODY0MDA=","url":"https://api.github.com/repos/gap-system/gap/labels/kind:%20bug:%20unexpected%20error","name":"kind: bug: unexpected error","color":"e11d21","default":false},{"id":300489417,"node_id":"MDU6TGFiZWwzMDA0ODk0MTc=","url":"https://api.github.com/repos/gap-system/gap/labels/regression","name":"regression","color":"eb6420","default":false},{"id":577473073,"node_id":"MDU6TGFiZWw1Nzc0NzMwNzM=","url":"https://api.github.com/repos/gap-system/gap/labels/topic:%20library","name":"topic: library","color":"c0d9f7","default":false}],"state":"open","locked":false,"assignee":{"login":"hulpke","id":7890800,"node_id":"MDQ6VXNlcjc4OTA4MDA=","avatar_url":"https://avatars0.githubusercontent.com/u/7890800?v=4","gravatar_id":"","url":"https://api.github.com/users/hulpke","html_url":"https://github.com/hulpke","followers_url":"https://api.github.com/users/hulpke/followers","following_url":"https://api.github.com/users/hulpke/following{/other_user}","gists_url":"https://api.github.com/users/hulpke/gists{/gist_id}","starred_url":"https://api.github.com/users/hulpke/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/hulpke/subscriptions","organizations_url":"https://api.github.com/users/hulpke/orgs","repos_url":"https://api.github.com/users/hulpke/repos","events_url":"https://api.github.com/users/hulpke/events{/privacy}","received_events_url":"https://api.github.com/users/hulpke/received_events","type":"User","site_admin":false},"assignees":[{"login":"hulpke","id":7890800,"node_id":"MDQ6VXNlcjc4OTA4MDA=","avatar_url":"https://avatars0.githubusercontent.com/u/7890800?v=4","gravatar_id":"","url":"https://api.github.com/users/hulpke","html_url":"https://github.com/hulpke","followers_url":"https://api.github.com/users/hulpke/followers","following_url":"https://api.github.com/users/hulpke/following{/other_user}","gists_url":"https://api.github.com/users/hulpke/gists{/gist_id}","starred_url":"https://api.github.com/users/hulpke/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/hulpke/subscriptions","organizations_url":"https://api.github.com/users/hulpke/orgs","repos_url":"https://api.github.com/users/hulpke/repos","events_url":"https://api.github.com/users/hulpke/events{/privacy}","received_events_url":"https://api.github.com/users/hulpke/received_events","type":"User","site_admin":false}],"milestone":null,"comments":1,"created_at":"2018-12-17T11:52:52Z","updated_at":"2018-12-17T13:56:11Z","closed_at":null,"author_association":"CONTRIBUTOR","body":"The following happens in GAP 4.10.0 as well as in the current master branch.\r\n\r\n```\r\ngap> g:= AtlasGroup( \"U3(8).3^2\" );;\r\ngap> Irr( g );;\r\nError, List Element: <list>[19] must have an assigned value in\r\n  M[s][t] := M[s][t] + T[2][i]; at /.../ctblgrp.gi:1790 called from\r\nD.ClassMatrixColumn( D, M, bestMat, col\r\n ); at /.../ctblgrp.gi:716 called from\r\nSplitStep( D, bsm ); at /.../ctblgrp.gi:2065 called from\r\nDixonSplit( D ) at /.../ctblgrp.gi:2171 called from\r\nIrrDixonSchneider( G, rec(\r\n     ) ) at /.../ctblgrp.gi:2152 called from\r\nIrrDixonSchneider( G ) at /.../ctblgrp.gi:2194 called from\r\n...  at *stdin*:2\r\ntype 'quit;' to quit to outer loop\r\n```\r\n\r\n(The error messages are not exactly the same in the two versions,\r\nin the sense that they point to different positions in `<list>`.)\r\n\r\nGAP 4.9.0 does not have this problem.\r\nThe same holds for GAP 4.7.6.\r\n(And the computation in GAP 4.9.0 is much faster than that in GAP 4.7.6.)"},"comment":{"url":"https://api.github.com/repos/gap-system/gap/issues/comments/447854036","html_url":"https://github.com/gap-system/gap/issues/3114#issuecomment-447854036","issue_url":"https://api.github.com/repos/gap-system/gap/issues/3114","id":447854036,"node_id":"MDEyOklzc3VlQ29tbWVudDQ0Nzg1NDAzNg==","user":{"login":"ThomasBreuer","id":25204833,"node_id":"MDQ6VXNlcjI1MjA0ODMz","avatar_url":"https://avatars3.githubusercontent.com/u/25204833?v=4","gravatar_id":"","url":"https://api.github.com/users/ThomasBreuer","html_url":"https://github.com/ThomasBreuer","followers_url":"https://api.github.com/users/ThomasBreuer/followers","following_url":"https://api.github.com/users/ThomasBreuer/following{/other_user}","gists_url":"https://api.github.com/users/ThomasBreuer/gists{/gist_id}","starred_url":"https://api.github.com/users/ThomasBreuer/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/ThomasBreuer/subscriptions","organizations_url":"https://api.github.com/users/ThomasBreuer/orgs","repos_url":"https://api.github.com/users/ThomasBreuer/repos","events_url":"https://api.github.com/users/ThomasBreuer/events{/privacy}","received_events_url":"https://api.github.com/users/ThomasBreuer/received_events","type":"User","site_admin":false},"created_at":"2018-12-17T13:56:11Z","updated_at":"2018-12-17T13:56:11Z","author_association":"CONTRIBUTOR","body":"@hulpke Thanks for investigating this problem.\r\nFor the sake of simplicity, take the two permutation generators as given by `AtlasGroup`,\r\nstart GAP without packages, and construct the group just from the given permutations.\r\nIn this situation, I get the abovementioned error message, and the GAP banner looks as follows.\r\n```\r\n ┌───────┐   GAP 4.10.0 of 01-Nov-2018\r\n │  GAP  │   https://www.gap-system.org\r\n └───────┘   Architecture: x86_64-pc-linux-gnu-default64\r\n Configuration:  gmp 6.1.2, Julia 1.1.0-DEV, readline\r\n Loading the library and packages ...\r\n Packages:   GAPDoc 1.6.2, PrimGrp 3.3.2, SmallGrp 1.3, TransGrp 2.0.4\r\n Try '??help' for help. See also '?copyright', '?cite' and '?authors'\r\n```\r\n`gcc --version` says `gcc (Ubuntu 5.4.0-6ubuntu1~16.04.10) 5.4.0 20160609`."}}
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