The InitialConditions property must be a scalar, vector or matrix. When you specify a vector, its length must be equal t

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The InitialConditions property must be a scalar, vector or matrix. When you specify a vector, its length must be equal to the number of delay elements in the filter.
When you specify a matrix, the matrix must have the same number of columns as the input signal. The number of rows in the matrix must equal the number of delay elements in the filter.

system