This should work in JAVA mode but since it uses native libraries it probaly won't work in JAVASCRIPT or ANDROID modes.

Assuming you have a byte array called b[] then to read this as a series of doubles

1. import java.nio.*;
2. 
   
3. ByteBuffer buf = ByteBuffer.wrap(b);
4. 
   
5. // The default ByteOrder is BIG_ENDIAN but depending on the source of
6. // the byte array you may have to change it to LITTLE_ENDIAN
7. // Only add the next line if it proves neccessary
8. buf.order(ByteOrder.LITTLE_ENDIAN);
9. 
   
10. // Each double requires 8 bytes make a double array big enough
11. double[] darray = new double(b.length / 8);
12. 
    
13. for(int i = 0; i < darray.length; i++){
14.       darray[i] = buf.readDouble();
15. }

Thanks Quarks, that's awesome. I had to change buf.readDouble(); to buf.getDouble(); but it works a treat.