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Checklist\r\n\r\n- [x] Run unit tests: `./runTests.py test/unit`\r\n- [x] Run cpplint: `make cpplint`\r\n- [x] Declare copyright holder and open-source license: see below\r\n\r\n#### Summary:\r\nRename `matrix_exp_action` function to `matrix_exp_multiply` & `scale_matrix_exp_multiply`.\r\n\r\n#### Intended Effect:\r\nAs discussed in https://github.com/stan-dev/math/issues/892, the `matrix_exp_action` from https://github.com/stan-dev/math/pull/830 is split into \r\n```Stan\r\nmatrix_exp_multiply(A, B);\r\nscale_matrix_exp_multiply(t, A, B);\r\n```\r\nThese functions will be exposed in Stan language.\r\n\r\nUnit tests are added to reflect the changes.\r\n\r\n#### How to Verify:\r\nUnit tests.\r\n\r\n#### Side Effects:\r\nn/a\r\n\r\n#### Copyright and Licensing\r\nMetrum Research Group, LLC\r\nPlease list the copyright holder for the work you are submitting (this will be you or your assignee, such as a university or company):\r\n\r\nBy submitting this pull request, the copyright holder is agreeing to license the submitted work under the following licenses:\r\n- Code: BSD 3-clause (https://opensource.org/licenses/BSD-3-Clause)\r\n- Documentation: CC-BY 4.0 (https://creativecommons.org/licenses/by/4.0/)\r\n","created_at":"2018-06-12T15:54:41Z","updated_at":"2018-06-12T15:54:41Z","closed_at":null,"merged_at":null,"merge_commit_sha":null,"assignee":null,"assignees":[],"requested_reviewers":[],"requested_teams":[],"labels":[],"milestone":null,"commits_url":"https://api.github.com/repos/stan-dev/math/pulls/904/commits","review_comments_url":"https://api.github.com/repos/stan-dev/math/pulls/904/comments","review_comment_url":"https://api.github.com/repos/stan-dev/math/pulls/comments{/number}","comments_url":"https://api.github.com/repos/stan-dev/math/issues/904/comments","statuses_url":"https://api.github.com/repos/stan-dev/math/statuses/4362752457218a7388176c8a3ed66f7abbf872cb","head":{"label":"yizhang-cae:feature/892_rename_matrix_exp_action","ref":"feature/892_rename_matrix_exp_action","sha":"4362752457218a7388176c8a3ed66f7abbf872cb","user":{"login":"yizhang-cae","id":33104304,"node_id":"MDQ6VXNlcjMzMTA0MzA0","avatar_url":"https://avatars0.githubusercontent.com/u/33104304?v=4","gravatar_id":"","url":"https://api.github.com/users/yizhang-cae","html_url":"https://github.com/yizhang-cae","followers_url":"https://api.github.com/users/yizhang-cae/followers","following_url":"https://api.github.com/users/yizhang-cae/following{/other_user}","gists_url":"https://api.github.com/users/yizhang-cae/gists{/gist_id}","starred_url":"https://api.github.com/users/yizhang-cae/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/yizhang-cae/subscriptions","organizations_url":"https://api.github.com/users/yizhang-cae/orgs","repos_url":"https://api.github.com/users/yizhang-cae/repos","events_url":"https://api.github.com/users/yizhang-cae/events{/privacy}","received_events_url":"https://api.github.com/users/yizhang-cae/received_events","type":"User","site_admin":false},"repo":{"id":114936337,"node_id":"MDEwOlJlcG9zaXRvcnkxMTQ5MzYzMzc=","name":"math","full_name":"yizhang-cae/math","owner":{"login":"yizhang-cae","id":33104304,"node_id":"MDQ6VXNlcjMzMTA0MzA0","avatar_url":"https://avatars0.githubusercontent.com/u/33104304?v=4","gravatar_id":"","url":"https://api.github.com/users/yizhang-cae","html_url":"https://github.com/yizhang-cae","followers_url":"https://api.github.com/users/yizhang-cae/followers","following_url":"https://api.github.com/users/yizhang-cae/following{/other_user}","gists_url":"https://api.github.com/users/yizhang-cae/gists{/gist_id}","starred_url":"https://api.github.com/users/yizhang-cae/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/yizhang-cae/subscriptions","organizations_url":"https://api.github.com/users/yizhang-cae/orgs","repos_url":"https://api.github.com/users/yizhang-cae/repos","events_url":"https://api.github.com/users/yizhang-cae/events{/privacy}","received_events_url":"https://api.github.com/users/yizhang-cae/received_events","type":"User","site_admin":false},"private":false,"html_url":"https://github.com/yizhang-cae/math","description":"Stan 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