How do I convert a vector column to a primitive array column?
How can I convert a Deephaven vector column to a primitive array column in Deephaven?
You can convert a Deephaven vector column to a primitive array column by using the array() method in a selection method's query string. Similarly, the vec() method can convert a primitive array type to a Deephaven vector type. Here, the array method converts an IntVector column to an int[] array. Here's an example:
from deephaven import empty_table
# Create a table with an IntVector column
t = empty_table(10).update(["X = i%2", "Y = i"]).group_by("X")
tm = t.meta_table
# Convert the IntVector column to an int[] column with array()
t1 = t.update("YJArray = array(Y)")
t1m = t1.meta_table
# Convert the int[] column to an IntVector column with vec()
t2 = t1.update("YDHVec = vec(YJArray)")
t2m = t2.meta_table
- t
- tm
- t1
- t1m
- t2
- t2m
The vec and array methods can handle the following types:
vec() | array() |
|---|---|
| byte[] | ByteVector |
| char[] | CharVector |
| double[] | DoubleVector |
| float[] | FloatVector |
| int[] | IntVector |
| long[] | LongVector |
| short[] | ShortVector |
note
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