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Is this right, that a set operation can instead change the dictionary passed? Maybe the set should do nothing if not known, and a get is needed to access the value?","created_at":"2016-09-26T06:59:36Z","updated_at":"2016-09-26T06:59:36Z","html_url":"https://github.com/nest/nest-simulator/pull/467#discussion_r80416689","pull_request_url":"https://api.github.com/repos/nest/nest-simulator/pulls/467","_links":{"self":{"href":"https://api.github.com/repos/nest/nest-simulator/pulls/comments/80416689"},"html":{"href":"https://github.com/nest/nest-simulator/pull/467#discussion_r80416689"},"pull_request":{"href":"https://api.github.com/repos/nest/nest-simulator/pulls/467"}}},"pull_request":{"url":"https://api.github.com/repos/nest/nest-simulator/pulls/467","id":82162047,"html_url":"https://github.com/nest/nest-simulator/pull/467","diff_url":"https://github.com/nest/nest-simulator/pull/467.diff","patch_url":"https://github.com/nest/nest-simulator/pull/467.patch","issue_url":"https://api.github.com/repos/nest/nest-simulator/issues/467","number":467,"state":"open","locked":false,"title":"Structural Plasticity steering","user":{"login":"sdiazpier","id":12412962,"avatar_url":"https://avatars.githubusercontent.com/u/12412962?v=3","gravatar_id":"","url":"https://api.github.com/users/sdiazpier","html_url":"https://github.com/sdiazpier","followers_url":"https://api.github.com/users/sdiazpier/followers","following_url":"https://api.github.com/users/sdiazpier/following{/other_user}","gists_url":"https://api.github.com/users/sdiazpier/gists{/gist_id}","starred_url":"https://api.github.com/users/sdiazpier/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/sdiazpier/subscriptions","organizations_url":"https://api.github.com/users/sdiazpier/orgs","repos_url":"https://api.github.com/users/sdiazpier/repos","events_url":"https://api.github.com/users/sdiazpier/events{/privacy}","received_events_url":"https://api.github.com/users/sdiazpier/received_events","type":"User","site_admin":false},"body":"This pull request enables the dynamic steering of structural plasticity parameters. This can be used to progressively explore the connectivity parameter space in a network and allows the stable creation of connections. It is specially useful in networks with multiple populations, where each must reach different target activity or when a base fixed connectivity is provided and strong activity dependencies between populations are 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