Should have FloatCol?

[wangtieqiao]

In the case to use Krangl for data pre-processing in Deep Learning (model operate on Float), to have FloatCol might be useful for large data set (memory usage). -- only see DoubleCol implemented.

[holgerbrandl]

I share the argument. Technically it would be even easy to do so. However. as we are currently use Array<Double?> to support NA, DoubleCol is not backed by a double-array, so we loose a lot of efficiency. The same would apply for FloatCol, so I'm not sure if adding using the current backend storage model makes much sense wrt to memory usage.

So my plan was/is to first find a more memory-efficient DoubleCol implementation, and then adopt the pattern when adding FloatCol.

Any help is welcome here.

[holgerbrandl]

See

krangl/src/main/kotlin/krangl/Columns.kt

Line 98 in bd5aa75

class DoubleCol(name: String, val values: Array<Double?>) : DataCol(name) {