清空筛选条件
清空筛选条件

Detect change between two values in an array

68 次查看（过去 30 天）
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.

请先登录，再回答此问题。

采纳的回答

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 %?
  4 个评论
显示 2更早的评论
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?

请先登录，再进行评论。

更多回答（1 个）

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
  6 个评论
显示 4更早的评论
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".

请先登录，再进行评论。

类别

在 Help Center 和 File Exchange 中查找有关 Logical 的更多信息

标签

Community Treasure Hunt

Find the treasures in MATLAB Central and discover how the community can help you!

Start Hunting!

Translated by