Stateflow get dimension of variable

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Roger Innes 2024-2-15

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https://ww2.mathworks.cn/matlabcentral/answers/2082658-stateflow-get-dimension-of-variable

评论： Fangjun Jiang 2024-2-23

I would like to get the dimension of an input/parameter to a stateflow model?

C code would be something like this.

Vartype Var[MaxArraySize];

size_t MaxArraySize = sizeof(Var) / sizeof(Vartype);

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Answer 1

Fangjun Jiang 2024-2-15

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https://ww2.mathworks.cn/matlabcentral/answers/2082658-stateflow-get-dimension-of-variable#answer_1409718

If action language is MATLAB, you can use size(input), or size(input,1), size(input,2)

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Roger Innes 2024-2-23

The issue was I was indexing the matix on the same line. size( input )(x) which is invalid matlab syntax. Using size( input, x) where x = 1 I got the length of the 1 by 3 matrix as 3.

The error I was getting was.

Parse error: ()-indexing must appear last in an index expression. State 'Test' "size( input )"

Which made it hard to understand what I was doing wrong. Which lead me to concluded the "size" command was invalid but it works correctly in stateflow.

Fangjun Jiang 2024-2-23

size( input )(x) is not valid in MATLAB.

"Using size( input, x) where x = 1 I got the length of the 1 by 3 matrix as 3"

If not specified, a 1x3 or 3x1 vector in Simulink shows size as 3 (at least in Simulink diagram signal line). If you specify the dimension of "input" as 1x3, I think size(input,1) will return 1.

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