cdm/src/main/java/ucar/ma2/MAMath.java
public static boolean conformable(int[] shapeA, int[] shapeB) {
    if (reducedRank(shapeA) != reducedRank(shapeB))
      return false;

    int rankB = shapeB.length;

    int dimB = 0;
    for (int aShapeA : shapeA) {
      //System.out.println(dimA + " "+ dimB);

      //skip length 1 dimensions
      if (aShapeA == 1)
        continue;
      while (dimB < rankB)
        if (shapeB[dimB] == 1) dimB++;
        else break;

      // test same shape (NB dimB cant be > rankB due to first test)
      if (aShapeA != shapeB[dimB])
        return false;
      dimB++;
    }

    return true;
  }
public static boolean conformable(int[] shapeA, int[] shapeB) {
    if (reducedRank(shapeA) != reducedRank(shapeB))
      return false;

    int rankB = shapeB.length;

    int dimB = 0;
    for (int aShapeA : shapeA) {
      //System.out.println(dimA + " "+ dimB);

      //skip length 1 dimensions
      if (aShapeA == 1)
        continue;
      while (dimB < rankB)
        if (shapeB[dimB] == 1) dimB++;
        else break;

      // test same shape (NB dimB cant be > rankB due to first test)
      if (aShapeA != shapeB[dimB])
        return false;
      dimB++;
    }

    return true;
  }
Check that two array shapes are conformable.
The shapes must match exactly, except that dimensions of length 1 are ignored.

@param shapeA shape of array 1
@param shapeB shape of array 2
@return true if conformable