What am I doing wrong with the function 'topkrows'

I am trying to use the function 'topkrows' - https://www.mathworks.com/help/matlab/ref/topkrows.html

Yet I cannot even do the example - when I try to use it I get the error "Undefined function 'topkrows' for input arguments type 'double'.

I also cannot find it when searching which topkrows.

Do I have a corrupted MATLAB download (using R2017a)

Any help would be great!

Answer 1

[Image Analyst]

It was introduced in R2016b (before your version). If you use which, you should see this:

>> which topkrows
C:\Program Files\MATLAB\R2017a\toolbox\matlab\datafun\topkrows.m

If you don't then call the Mathworks for fast and free friendly help because your installation is messed up, or you're not using R2017a like you thought.

[Systematically Neural]

Ok, I think there is an issue with 2017a's release. I will just go back to older version.

-Thanks

Answer 2

[Razvan Carbunescu]

topkrows was initially introduced in R2016b as a function for tall arrays and tables only.

In R2017b the functionality was added for regular matrices and tables.

As a workaround in R2017a should use S = sortrows(A); and then index S(1:k,:);