how to fix this error "Dot indexing is not supported for variables of this type"

nuser = kernel_param.nuser;

nmovie = kernel_param.nmovie;

ndata = kernel_param.ndata;

this is my code and when i run this code, i get the following error,

""Dot indexing is not supported for variables of this type""

what does this error mean, and how to solve it, please

[Allen]

@Waseem Abbas you should also provide some details on your data set to the kernel_param variable or a sample set of that data.

Answer 1

[Voss]

It means kernel_param is not a struct.

Here kernel_param is a struct, so it works fine:

kernel_param = struct('nuser',0,'nmovie',99)

kernel_param = struct with fields:
     nuser: 0
    nmovie: 99

nuser = kernel_param.nuser

nuser = 0

nmovie = kernel_param.nmovie

nmovie = 99

And here kernel_param is not a struct, so you get that error:

kernel_param = [1 2 3]

kernel_param = 1×3

1 2 3

nuser = kernel_param.nuser

Dot indexing is not supported for variables of this type.

How to solve it? Check where kernel_param comes from, and figure out why it's not a struct when it should be, or figure out why your code expects it to be a struct when it's not.

[Waseem Abbas]

thanks for the answer, i have another file in which these kernel are struct, so i have to run that file before runing this file?

am i right?

[Voss]

Possibly. I have no way to know what that file does.