I try to read a matrix with readRealMatrix and mutiply it by a vector x.

How can I create the vector x with dimension equal to those of the matrix :

model TestRead
  "Demonstrate usage of function Streams.readRealMatrix"
  import Modelica.Utilities.Streams.print;
  extends Modelica.Icons.Example;
   final parameter String file1 = Modelica.Utilities.Files.loadResource("modelica://Modelica/Resources/Data/Utilities/Test_RealMatrix_v4.mat") "File name of check matrix 1";

  final parameter String matrixName1 = "Matrix_A" "Names of check matrices";
  final parameter Integer dim1[2] = Modelica.Utilities.Streams.readMatrixSize(file1,matrixName1) "Dimension of check matrix 1";

  final parameter Real A1[:,:] = Modelica.Utilities.Streams.readRealMatrix(file1,matrixName1,dim1[1],dim1[2]) "Data of check matrix 1";

  Real x[dim1[1]] (each fixed = false)  "Dummy state" ;
  Real y ;
  initial equation
  x = fill(1.,dim1[1]) ;
equation

y  = -A1[1,1]*x[1];

end TestRead;