Readin a two-dimensional array using scala

Question

Suppose I have a txt file named "input.txt" and I want to use scala to read it in. The dimension of the file is not available in the beginning.

So, how to construct such an Array[Array[Float]]? What I want is a simple and neat way rather than write some code like in Java to iterates over lines and parse each number. I think functional programming should be quite good at it.. but cannot think of one up to now.

Best Regards

Are you sure that you want an Array? It is not needed if all you want is to iterate on it, and better structure, like iterators, may be better suited depending of your use cases. — fanf42
– fanf42, Commented Feb 10, 2013 at 14:55

Sergey Passichenko · Accepted Answer · 2013-02-10 16:42:32Z

5

If your input is correct, you can do it in such way:

val source = io.Source.fromFile("input.txt")
val data = source.getLines().map(line => line.split(" ").map(_.toFloat)).toArray
source.close()

Update: for additional information about using Source check this thread

edited Feb 10, 2013 at 16:42

answered Feb 10, 2013 at 14:18

Sergey Passichenko

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1 Comment

huynhjl Over a year ago

Note that this will leave a file descriptor open.

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