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

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Waseem Abbas
Waseem Abbas 2022-5-24
评论： Voss 2022-5-24
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

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回答（1 个）

Voss
Voss 2022-5-24
编辑：Voss 2022-5-24
Ran in:
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.

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