Unable to perform assignment because dot indexing is not supported for variables of this type.

Hello everyone.

There is the code that I want to use, but there is still error with it. How can I fix it?

AUTHMET.Hour.Format= "HH:00"

writetable (AUTHMET, '20230205_AUTHMET_hourly.txt')

[Walter Roberson]

What is

class(AUTHMET.Hour)

It appears that you are expecting it to be either datetime or duration

[Amelia]

Yes, it should be time

[Walter Roberson]

Put a breakpoint in the code and run to there. show us

classs(AUTHMET) 
class(AUTHMET.Hour)

There is a chance that one of those two is [] the empty array

Answer 1

[Arun]

Hi Amelia,

I understand that you want to set the hour format to “HH:00” for AUTHMET which is a datetime data type.

The “setDefaultFormats” property would be useful in this case. Here is a modified code of your implementation that might be useful for your issue:

% sample value for AUTHMET
AUTHMET = datetime('2022-01-01 12:00:23');
% set the format for Hour as hh:00
datetime.setDefaultFormats('default','yyyy-MM-dd hh:00');
%verify the values.
display(AUTHMET.Hour);    %Hour value for AUTHMET 

    12

display(AUTHMET.Year);    %Year value for AUTHMET

        2022

display(AUTHMET);         %Value of AUTHMET 

AUTHMET = datetime
   2022-01-01 12:00

writematrix(AUTHMET, '20230205_AUTHMET_hourly.txt'); %write the text to the file.

for more information regarding the following topics please refer to the MATLAB documentation links:

1. Datetime data: https://www.mathworks.com/help/matlab/ref/datetime.html

2. Set Date and Time Display format: https://www.mathworks.com/help/matlab/matlab_prog/set-display-format-of-date-and-time-arrays.html

I hope this helps.

[Dyuman Joshi]

Functionality or property might be better fitting to describe "setDefaultFormats"