Detect change between two values in an array

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Muneer
Muneer 2013-10-1
评论： Image Analyst 2018-8-25
Is there any function in Matlab that allows you to read through a column in an array and see if a previous value is the same as a current value? I know there is the "detect change" function block in Simulink and was looking to do something similar with code, however.

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Sean de Wolski
Sean de Wolski 2013-10-1
编辑：Sean de Wolski 2013-10-1
x = [1 1 2 3 4 4 5 6 6 6 6 7];
diff(x)==0 %?
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Brandon Leonard
Brandon Leonard 2018-4-16
编辑：Brandon Leonard 2018-4-16
Sean de Wolski would this same approach work for two values from data collected (e.g. day = 1; night = 2) to locate where this change occurs in continuous data if data was stored in a timeseries? Could it be logged as a event(e.g. tsdata.event.EventData = logical(diff(x)) somehow?

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Image Analyst
Image Analyst 2013-10-1
Try this:
x=[ 0 0 4 5 7 3 3 87 2 5 1 1]
changedIndexes = diff(x)~=0
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Image Analyst
Image Analyst 2018-8-25
Table variables can be nan, just like double variables. Actually a column of a table has to be a predetermined type, like double, char, int32, or whatever. So if a column is double, then it's allowable for a row in that double column to have a value of "nan".

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