9. Vectors and arrays

For large data sets (e.g. increments of aerodynamic coefficients due to control surface deflections) it is advantageous to map them via vectors and arrays instead of using a sequence of nodes for each data value. Therefore vectors and arrays are defined as semicolon-separated lists in CPACS. Via the documentation (derived from the XSD) of the corresponding nodes it has to be checked whether it is a vector or an array.

• Vector

  The vector is meant as a one-dimensional-array. In such a node, the values are given in a semicolon separated list:

  <angleOfAttack>0.;1.5;3.;4.5;6;7.5;9.</angleOfAttack>

• Array

  As for vectors, multi-dimensional arrays provide values in a semicolon separated list. An array is always preceded by a sequence of vectors, containing the dimensions and index values. Which vectors of an array are dimensioning is specified in the respective documentation of the array.

  <altitude>1000.;2000.;3000.</altitude> <!-- vector element -->
  <incrementMaps>
      <incrementMap uID="incMap_b3ac2">
          <controlSurfaceUID>InnerWingFlap</controlSurfaceUID>
          <controlParameters>-1;-0.5;0;1</controlParameters> <!-- vector element -->
          <!-- array of dimension length(altitude) x length(controlParameters): -->
          <dcl>11.;12.;13.;14.;21.;22.;23.;24.;31.;32.;33.;34.</dcl>
          ...
      </incrementMap>
  </incrementMaps>

  Values for cl increments:

  	Control parameter = -1	Control parameter = -0.5	Control parameter = 0	Control parameter = 1
  Altitude = 1000m	11.	12.	13.	14.
  Altitude = 2000m	21.	22.	23.	24.
  Altitude = 3000m	31.	32.	33.	34.