Aha.
You're trying to read and write whole vectors.
Split them into scalar values, because read/write does on value at a time.

Try the below code - it ought to work.

//---------------------Head------------------------

#declare Vector1 = array[2][3] //2 rows and 3 columns
#declare Vector2 = array[2][3]

#fopen MyFile "data.txt" read
#fopen MyFile1 "data.out" write

#while (defined(MyFile))
#read  (MyFile, Scalar1, Scalar2, Scalar3, Scalar4, Scalar5, Scalar6)
// {Be sure to include debug.inc file!}
#debug concat( " Scalar1 = ", str(Scalar1, 3, 1),  " Scalar2 = ", str(Scalar2,
3, 1), " Scalar3 = ", str(Scalar3, 3, 1), "\n")
#debug concat( " Scalar4 = ", str(Scalar4, 3, 1),  " Scalar5 = ", str(Scalar5,
3, 1), " Scalar6 = ", str(Scalar6, 3, 1), "\n")

#declare Vector1 = <Scalar1, Scalar2, Scalar3>;
#declare Vector2 = <Scalar4, Scalar5, Scalar6>;

#debug concat( "Vector1 = ", vstr(3, Vector1, ", ", 3, 0), " \n")
#debug concat( "Vector2 = ", vstr(3, Vector2, ", ", 3, 0), " \n")

#debug " \n \n"
#write (MyFile1, Scalar1, Scalar2, Scalar3, Scalar4, Scalar5, Scalar6)// check
what I am reading in any data
#end

#fclose MyFile
#fclose MyFile1
//---------------------end--------------------------------

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