{"action":"created","issue":{"url":"https://api.github.com/repos/gprMax/gprMax/issues/170","repository_url":"https://api.github.com/repos/gprMax/gprMax","labels_url":"https://api.github.com/repos/gprMax/gprMax/issues/170/labels{/name}","comments_url":"https://api.github.com/repos/gprMax/gprMax/issues/170/comments","events_url":"https://api.github.com/repos/gprMax/gprMax/issues/170/events","html_url":"https://github.com/gprMax/gprMax/issues/170","id":356335767,"node_id":"MDU6SXNzdWUzNTYzMzU3Njc=","number":170,"title":"Source: excitation_file/Built-in waveforms","user":{"login":"AlinaYLN","id":33473088,"node_id":"MDQ6VXNlcjMzNDczMDg4","avatar_url":"https://avatars1.githubusercontent.com/u/33473088?v=4","gravatar_id":"","url":"https://api.github.com/users/AlinaYLN","html_url":"https://github.com/AlinaYLN","followers_url":"https://api.github.com/users/AlinaYLN/followers","following_url":"https://api.github.com/users/AlinaYLN/following{/other_user}","gists_url":"https://api.github.com/users/AlinaYLN/gists{/gist_id}","starred_url":"https://api.github.com/users/AlinaYLN/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/AlinaYLN/subscriptions","organizations_url":"https://api.github.com/users/AlinaYLN/orgs","repos_url":"https://api.github.com/users/AlinaYLN/repos","events_url":"https://api.github.com/users/AlinaYLN/events{/privacy}","received_events_url":"https://api.github.com/users/AlinaYLN/received_events","type":"User","site_admin":false},"labels":[],"state":"open","locked":false,"assignee":null,"assignees":[],"milestone":null,"comments":6,"created_at":"2018-09-03T02:01:51Z","updated_at":"2018-09-12T05:11:19Z","closed_at":null,"author_association":"NONE","body":"I would like to ask if I can specify the excitation source using my own functions , just like the built-in waveforms,  instead of specifying an ASCII file that contains columns of amplitude values. If possible, where should I write code to create my own excitation source. Thank you for reading and guiding. "},"comment":{"url":"https://api.github.com/repos/gprMax/gprMax/issues/comments/420514192","html_url":"https://github.com/gprMax/gprMax/issues/170#issuecomment-420514192","issue_url":"https://api.github.com/repos/gprMax/gprMax/issues/170","id":420514192,"node_id":"MDEyOklzc3VlQ29tbWVudDQyMDUxNDE5Mg==","user":{"login":"springliu","id":9677588,"node_id":"MDQ6VXNlcjk2Nzc1ODg=","avatar_url":"https://avatars2.githubusercontent.com/u/9677588?v=4","gravatar_id":"","url":"https://api.github.com/users/springliu","html_url":"https://github.com/springliu","followers_url":"https://api.github.com/users/springliu/followers","following_url":"https://api.github.com/users/springliu/following{/other_user}","gists_url":"https://api.github.com/users/springliu/gists{/gist_id}","starred_url":"https://api.github.com/users/springliu/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/springliu/subscriptions","organizations_url":"https://api.github.com/users/springliu/orgs","repos_url":"https://api.github.com/users/springliu/repos","events_url":"https://api.github.com/users/springliu/events{/privacy}","received_events_url":"https://api.github.com/users/springliu/received_events","type":"User","site_admin":false},"created_at":"2018-09-12T05:11:19Z","updated_at":"2018-09-12T05:11:19Z","author_association":"NONE","body":"@craig-warren thanks for your attention and the advises. using the linear extrapolate can solve the problem, however the result of the waveform is wrong.\r\n![image](https://user-images.githubusercontent.com/9677588/45403432-d92bc080-b68c-11e8-85ff-193c5b36025f.png)\r\nthe result of the gprMax  is shown in up. and it should be like this: \r\n![image](https://user-images.githubusercontent.com/9677588/45403501-4d666400-b68d-11e8-8283-a67aa32c1650.png)\r\n\r\n\r\n\r\n\r\n"}}
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