在Scala中创建具有一定数字范围（双精度型）的数组的最佳方法

Question

I want to create a range number for an array. The data type is Double, not Int. it looks like: [1.0,2.0,3.0,4.0....]

Now I am doing like

val arraydataInt=1 to 1000 toArray
val arraydata = arraydataInt.map(x=>x.toDouble)

I am just not sure if the way is efficient.

Answer 1

Iterate or tabulate, take your pick.

Array.iterate(1.0,1000)(1.+)
// or
Array.tabulate(1000)(1.0.+)

Answer 2

在范围内使用双打

1d to 1000d by 1d toArray