Matlab coder logical indexing structs

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Mohammed Kagalwala 2020-2-18

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编辑： Stephen23 2020-2-18

Hello,

I currently have a struct defined as such,

struct(1).a

struct(2).a

struct(3).a

...

struct(N).a

where the field a is a 3x3 matrix. When I'm attempting to convert Matlab code to C through the code I run into the follwing error when trying to access the above struct through a logical index, lg.

What I'm attempting:

b = blkdiag(struct(lg).a);

Error I get:

"Directly accessing field or property of nonscalar struct or object not supported for code code generation."

I'm not fully understanding the error. Furthermore isn't 'struct' a scalar struct in this case. Note: 'struct' does have other fields that are matrices, scalars and logicals as well.

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Stephen23 2020-2-18

编辑：Stephen23 2020-2-18

在 MATLAB Online 中打开

"I currently have a struct defined as such,"

struct(1).a
struct(2).a
struct(3).a
...
struct(N).a

Hopefully you do NOT have a structure named struct. That would be a very unfortunate name for a structure, as it would shadow the inbuilt struct function.

"Furthermore isn't 'struct' a scalar struct in this case."

Only if N==1. If N~=1 then the structure is non-scalar.

Just like any other array, a scalar structure has size 1x1x1x1x1x1...

If N~=1, then regardless of what dimension it corresponds to, the structure cannot be scalar.

https://www.mathworks.com/help/matlab/matlab_prog/access-multiple-elements-of-a-nonscalar-struct-array.html

Note: the number of fields a structure has is completely independent of its size.

Mohammed Kagalwala 2020-2-18

I do not have a struct named struct, this is just a simple label for example purposes. From some trial and error it seems the C Coder does NOT support the use of logicals to index into such structs

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