R help - Jun 2021 - Mean absolute error from data matrix

I have data matrix of order 24*2192 where 2192 are the days and 24 are
hour's of a single day,so simple words I have 2192 days and each day having
24 observations.the data matrix is divided into two matrix,the ist matrix is of
order 24*1827 and second is of order 24*365. Suppose the ist column of the
second matrix is Sunday then we choose each column of the first matrix having
Sunday. The takeing the first column of data matrix is converted into vector and
all the Sunday columns are converted into vectors. Then we calculate mean
absolute errors for different pairs of the first vector of the second matrix
with each vector of first matrix. Similarly process is repeated for the rest of
the week days. It clear that such process is quite time consuming and hard if
perform manually. Can any one provides the easiest way to do such
problem.Regard?

Sent from Yahoo Mail on Android
	[[alternative HTML version deleted]]

Hi.

First, please do not post in HTML. It usually scrambles any posted code.

Second, as you did not post any code or data your message was not scrambled 
but I wonder what are columns and what are rows and what do you actually 
calculates.

From

Suppose the ist column of the
> second matrix is Sunday then we choose each column of the first matrix
> having Sunday
I deduct that you have 24 rows and 1827 or 365 columns.

It sems to me that you will have easier situation if you transpose matrix, set 
column with dates. From that you can choose all dates fulfilling criteria 
(being Sunday)
See help page for Date
weekdays(.leap.seconds)

and you can do any calculation for each row
See tapply, aggregate, ...

Cheers
Petr

> -----Original Message-----
> From: R-help <r-help-bounces at r-project.org> On Behalf Of Faheem
Jan via
> R-help
> Sent: Wednesday, June 23, 2021 8:03 PM
> To: R-help Mailing List <r-help at r-project.org>
> Subject: [R] Mean absolute error from data matrix
>
> I have data matrix of order 24*2192 where 2192 are the days and 24 are
> hour's of a single day,so simple words I have 2192 days and each day
having
> 24 observations.the data matrix is divided into two matrix,the ist matrix
is
> of
> order 24*1827 and second is of order 24*365. Suppose the ist column of the
> second matrix is Sunday then we choose each column of the first matrix
> having Sunday. The takeing the first column of data matrix is converted
into
> vector and all the Sunday columns are converted into vectors. Then we
> calculate mean absolute errors for different pairs of the first vector of 
> the
> second matrix with each vector of first matrix. Similarly process is 
> repeated
> for the rest of the week days. It clear that such process is quite time
> consuming and hard if perform manually. Can any one provides the easiest
> way to do such problem.Regard
>
> Sent from Yahoo Mail on Android
> 	[[alternative HTML version deleted]]
>
> ______________________________________________
> R-help at r-project.org mailing list -- To UNSUBSCRIBE and more, see
> https://stat.ethz.ch/mailman/listinfo/r-help
> PLEASE do read the posting guide http://www.R-project.org/posting-
> guide.html
> and provide commented, minimal, self-contained, reproducible code.