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Datetime coloumn in a matrix of double

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Andrea Sbaragli
Andrea Sbaragli 2021-5-12
评论： Stephan 2021-5-12
I start from this matrix A = mx 4 where
1- epoch time in nanosec
2- number double
3- number double
4- number double
Through this function "datetime(T1(i,1),'ConvertFrom','epochtime','TicksPerSecond',1e9,'Format','dd-MMM-yyyy HH:mm:ss.SSSSSSSSS')" I created an array mx1 where I converted the epoch time to date time
At this point I m looking to create the same matrix as before replacing the first coloumn with the new created vector but it returns me an error because date type are not equal. How to do that?

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Stephan
Stephan 2021-5-12
编辑：Stephan 2021-5-12
You can not mix data types in arrays - use a table or a timetable to do this. In your case the array2table or array2timetable might be useful.
  2 个评论
Andrea Sbaragli
Andrea Sbaragli 2021-5-12
Ok it works in this way but afterward I cannot operate anymore in values inside. What do you suggest? it is more convenient keep separate them?
Stephan
Stephan 2021-5-12
You access table elements using this notation:
A{:,1} % all rows of column 1
A{1:5,4} % rows 1...5 of column 4

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