On 7/19/2012 11:22 AM, Smit, Christine E. (GSFC-610.2)[TELOPHASE CORP]
wrote:
I'm doing a double slice on a three-dimensional variable to get a 1-D slice and
then trying to read out the values. Unfortunately, indexing seems to give me
values from the full original array rather than the slice I'm working with.
Array twoD = array.slice(0, 1);
Array oneD = twoD.slice(0,1);
System.out.println(oneD.getDouble(0));
System.out.println(oneD);
System.out.println(array.getDouble(0));
This is what I see:
178.0
-9999 -9999 -9999 81 66 93 103 -9999 -9999 -9999 -9999 -9999
178.0
I would expect the first print statement to print -9999 since that is the first
element of the slice I'm working on. So this kind of looks like a bug to me.
How do I get the first element of my slice rather than of the entire parent
array?
Hi Christine:
It look s ok to me. heres an example you can modify. if you see a
problem send me the program.
public void testSlice3D() throws InvalidRangeException {
Array a = Array.makeArray(DataType.DOUBLE, 1000, 0.0, 1.0);
Array a3 = a.reshape(new int[] {10,10,10});
NCdumpW.printArray(a3);
Array twoD = a3.slice(0,1);
Array oneD = twoD.slice(0,1);
System.out.printf("%n%f%n", oneD.getDouble(0));
System.out.printf("%s%n", oneD);
System.out.printf("%f%n%n", a3.getDouble(0));
NCdumpW.printArray(oneD);
}
Note the signature for slice:
/**
* Create a new Array using same backing store as this Array, by
* fixing the specified dimension at the specified index value. This
reduces rank by 1.
*
* @param dim which dimension to fix
* @param value at what index value
* @return a new Array
*/
public Array slice(int dim, int value);
John
