{"action":"opened","issue":{"url":"https://api.github.com/repos/LSSTDESC/CCL/issues/333","repository_url":"https://api.github.com/repos/LSSTDESC/CCL","labels_url":"https://api.github.com/repos/LSSTDESC/CCL/issues/333/labels{/name}","comments_url":"https://api.github.com/repos/LSSTDESC/CCL/issues/333/comments","events_url":"https://api.github.com/repos/LSSTDESC/CCL/issues/333/events","html_url":"https://github.com/LSSTDESC/CCL/issues/333","id":297974555,"number":333,"title":"Read in arbitrary tomographic dN/dz","user":{"login":"ssamuroff","id":12500857,"avatar_url":"https://avatars2.githubusercontent.com/u/12500857?v=4","gravatar_id":"","url":"https://api.github.com/users/ssamuroff","html_url":"https://github.com/ssamuroff","followers_url":"https://api.github.com/users/ssamuroff/followers","following_url":"https://api.github.com/users/ssamuroff/following{/other_user}","gists_url":"https://api.github.com/users/ssamuroff/gists{/gist_id}","starred_url":"https://api.github.com/users/ssamuroff/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/ssamuroff/subscriptions","organizations_url":"https://api.github.com/users/ssamuroff/orgs","repos_url":"https://api.github.com/users/ssamuroff/repos","events_url":"https://api.github.com/users/ssamuroff/events{/privacy}","received_events_url":"https://api.github.com/users/ssamuroff/received_events","type":"User","site_admin":false},"labels":[{"id":542008189,"url":"https://api.github.com/repos/LSSTDESC/CCL/labels/Development","name":"Development","color":"f0d0ee","default":false},{"id":366272387,"url":"https://api.github.com/repos/LSSTDESC/CCL/labels/Enhancement","name":"Enhancement","color":"84b6eb","default":false},{"id":366272390,"url":"https://api.github.com/repos/LSSTDESC/CCL/labels/Question","name":"Question","color":"cc317c","default":false}],"state":"open","locked":false,"assignee":null,"assignees":[],"milestone":null,"comments":0,"created_at":"2018-02-17T03:23:44Z","updated_at":"2018-02-17T03:23:44Z","closed_at":null,"author_association":"NONE","body":"As far as I can see, setting up a dNdz_tomog object requires a redshift error function p(z_phot | z_spec) to be provided, which is then integrated with the dN/dz from Chang et al. One possibly useful extension is the ability to read in an arbitrary set of tomographic dN/dz directly without having to specify an underlying analytic error model. So, for example, one might want to input the DES Y1 redshift distributions from a file, and pass them through the subsequent theory calculations to predict Cls, xi_+/- etc.\r\n\r\nI appreciate this functionality is already there in CosmoSIS and CosmoLike, but I think it's a nice feature to have for forecasting. It would also be needed if we want to be able to call CCL for the modelling part of a likelihood analysis involving real data.\r\nDo people agree this would be useful? If so I could look into implementing it.\r\n\r\n(Also, I think this is similar but non-identical to issue #298 - sorry if I'm actually repeating what was requested there, or if I've misunderstood the code as-is and this is already possible)."}}
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