Let me guess, you're trying to rename the Time of a timetable.
dt = datetime('today') + days(1:4).';
t = array2timetable(magic(4), 'RowTimes', dt)
t =
Time Var1 Var2 Var3 Var4
___________ ____ ____ ____ ____
20-Jun-2022 16 2 3 13
21-Jun-2022 5 11 10 8
22-Jun-2022 9 7 6 12
23-Jun-2022 4 14 15 1
t.Properties
ans =
TimetableProperties with properties:
Description: ''
UserData: []
DimensionNames: {'Time' 'Variables'}
VariableNames: {'Var1' 'Var2' 'Var3' 'Var4'}
VariableDescriptions: {}
VariableUnits: {}
VariableContinuity: []
RowTimes: [4×1 datetime]
StartTime: 20-Jun-2022
SampleRate: NaN
TimeStep: 1d
CustomProperties: No custom properties are set.
Use
addprop and
rmprop to modify CustomProperties.
t2 = renamevars(t, 'Time', 'Date')
Error using tabular/renamevars
Renaming dimension names is not supported using RENAMEVARS.
While Time looks like a variable, it's actually the name of the first dimension of t. You can use t.Time to get all of the row times, just like you can (if they can be concatenated into one array) use t.Variables to get all the data in the array.
See the description of DimensionNames in the Name-Value Arguments subsection under the Input Arguments section as well as the description of DimensionNames in the Properties section of this documentation page for more information about dimension names for a timetable. This would work (but not in this Answers post, since MATLAB threw an error above.)
t.Properties.DimensionNames{1} = 'Date';
