Using Arrays in Actions

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Array Notation Arrays and Custom Code

Array Notation

A Stateflow action uses C style syntax and zero-based indexing by default to access array elements. This syntax differs from MATLAB notation, which uses one-based indexing. For example, suppose you define a Stateflow input A of size [3 4]. To access the element in the first row, second column, use the expression A[0][1]. Other examples of zero-based indexing in Stateflow actions include:

local_array[1][8][0] = 10;

local_array[i][j][k] = 77;

var = local_array[i][j][k];

Note   Use the same notation for accessing arrays in Stateflow charts, from Simulink models, and from custom code.

As an exception to zero-based indexing, scalar expansion is available. This statement assigns a value of 10 to all the elements of the array local_array.

local_array = 10;

Scalar expansion is available for performing general operations. This statement is valid if the arrays array_1, array_2, and array_3 have the same value for the Sizes property.

array_1 = (3*array_2) + array_3;

Note   For more information, see Using Vectors and Matrices in Stateflow Charts.

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Arrays and Custom Code

Stateflow action language provides the same syntax for Stateflow arrays and custom code arrays.

Note   Any array variable that is referred to in a Stateflow chart but is not defined in the Stateflow hierarchy is identified as a custom code variable.

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Using Data and Event Arguments in Actions

Broadcasting Events to Synchronize States

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