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====== Differences ====== This shows you the differences between two versions of the page.

--- analysis:amplipex:artifacts [2014/01/20 19:16]
ecarmichael
+++ analysis:amplipex:artifacts [2018/04/17 15:20] (current)
@@ Line 20: / Line 20: @@
 cfg.alim        = [];
 cfg.coninuous   = 'yes';
-cfg.viewmode    = 'vertical';
+cfg.viewmode    = 'vertical'; % this shows all of the channels vertically
-cfg = ft_databrowser(cfg,data_art_rem);
+cfg = ft_databrowser(cfg,data_trl);
+data_trl.cfg = cfg; % rewrite the cfg back into the data set
 </code>
+The browser will let you scroll through the trials and use the cursor to highlight a section of the data containing an artifact.
+{{:analysis:amplipex:artifact_wiki.png?750|}}
+The selected artifact regions are not altered within the data itself, instead the start and end of each artifact are saved as part of the cfg structure: data_trl.cfg.artfctdef.visual.artifact . So now can change these regions to any value of our choice.
+<code matlab>
+%% Mannual Artifact removal
+art_value = 0; %Value to replace the data within artifact regions
+artifacts = data_trl.cfg.artfctdef.visual.artifact;
+trials = data_trl.cfg.trl;
+for iArt = 1:length(artifacts)
+    for iTrial = 1:length(trials)
+        if trials(iTrial,1)<= artifacts(iArt,1) && trials(iTrial,2)>= artifacts(iArt,2)
+            if artifacts(iArt,1)-trials(iTrial,1) ==0
+                data_trl.trial{1,iTrial}(1:16,(1:artifacts(iArt,2)-trials(iTrial,1)))=art_value;
+            else
+            data_trl.trial{1,iTrial}(1:16,(artifacts(iArt,1)-trials(iTrial,1):artifacts(iArt,2)-trials(iTrial,1)))=art_value;
+            end
+        end
+    end
+end
+</code>
+Now we can visualize the data regions that have been replaced to ensure they have been correctly converted.
+<code matlab>
+cfg.viewmode    = 'vertical'; % this shows all of the channels vertically
+ft_databrowser(cfg,data_trl);
+</code>
+From here we can run any further ft analysis.

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