converting the time data into Datetime Format

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muhammad choudhry
muhammad choudhry 2022-3-13
评论： Peter Perkins 2022-3-14
Hi,
I am transfering the data from ultrasonic sensor into the excel file attached and using the code below but I am keep getting error that my data not in right format, it ask me firstofall to read the data in matric rather then table I done both but still getting error. " i want to understand what am i doing wrong and how to correct it" please
Error while reading as table:
Error using datetime (line 597)
Numeric input data must be a matrix with three or six columns, or else three, six, or seven separate numeric arrays. You can also create datetimes from a
single numeric array using the 'ConvertFrom' parameter.
Error in dateformat (line 5)
th = datetime(Hdat.TimeStamp,'InputFormat','dd.MM.yyyy HH:mm:ss.SSS');
Error while reading as Matrix:
Dot indexing is not supported for variables of this type.
Error in dateformat (line 5)
th = datetime(Hdat.TimeStamp,'InputFormat','dd.MM.yyyy HH:mm:ss.SSS');
Code Used:
Hdat = readtable('F:\3-PIV_Experimental_Data\Outlet_110\Data_LaserSheet_D\Data_Head\Data_Raw\Head_Timestamps.xlsx');
th = datetime(Hdat.TimeStamp,'InputFormat','dd.MM.yyyy HH:mm:ss.SSS');
h = Hdat.Head_mm_;

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采纳的回答

Arif Hoq
Arif Hoq 2022-3-13
try this syntax:
th = datetime(A.TimeStamp,'InputFormat','dd.MM.yyyy HH:mm:ss.SSS','ConvertFrom','datenum');
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Arif Hoq
Arif Hoq 2022-3-13
try this:
th = datetime(A.TimeStamp,'Format','HH:mm:ss','ConvertFrom','datenum');

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更多回答（1 个）

Walter Roberson
Walter Roberson 2022-3-13
As discussed in your other Question, the field in the file stores fraction of days in numeric form, and has no date information.
th = days(A.TimeStamp);
th.Format = 'hh:mm:ss' ;

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