converting Object[] to double[]?

[Daniel]

Using Java 1.4.2, I'm trying to convert a vector to a double[].
If I try this:
double[] foo = vector.toArray(new double[5]);
I get a compile error. But it compiles just fine if I use Double[]
Can I convert a vector to double[], or is there a quick conversion from
Double[] to double[]?

 

[Lothar Kimmeringer]

Using Java 1.4.2, I'm trying to convert a vector to a double[].
If I try this:
double[] foo = vector.toArray(new double[5]);
I get a compile error. But it compiles just fine if I use Double[]

double is a primitive type and Vector is using an Object[] for
keeping the values, so it's possible to get a double[] out of
an Object[].

Can I convert a vector to double[], or is there a quick conversion from
Double[] to double[]?

Why can't you use a Double[] instead of a double[]? The only
thing you have to change is a call of doubleValue() when working
with the values.


Regards, Lothar
--
Lothar Kimmeringer E-Mail: (e-mail address removed)
PGP-encrypted mails preferred (Key-ID: 0x8BC3CD81)

Always remember: The answer is forty-two, there can only be wrong
questions!

 

[Daniel]

I can't use Double[] because I'm using a library that needs me to pass in a
double[]
so I'd need to convert it to double[] before passing it it. I was hoping java
provides a method to take Double[] --> double[] without my having to build a
loop to do it manually.

Using Java 1.4.2, I'm trying to convert a vector to a double[].
If I try this:
double[] foo = vector.toArray(new double[5]);
I get a compile error. But it compiles just fine if I use Double[]

double is a primitive type and Vector is using an Object[] for
keeping the values, so it's possible to get a double[] out of
an Object[].

Can I convert a vector to double[], or is there a quick conversion from
Double[] to double[]?

Why can't you use a Double[] instead of a double[]? The only
thing you have to change is a call of doubleValue() when working
with the values.

Regards, Lothar
--
Lothar Kimmeringer E-Mail: (e-mail address removed)
PGP-encrypted mails preferred (Key-ID: 0x8BC3CD81)

Always remember: The answer is forty-two, there can only be wrong
questions!

 

[Lothar Kimmeringer]

I can't use Double[] because I'm using a library that needs me to pass in a
double[]
so I'd need to convert it to double[] before passing it it. I was hoping java
provides a method to take Double[] --> double[] without my having to build a
loop to do it manually.

You can also implement your own Vector working with double:

void DoubleVector.add(double);
double DoubleVector.get(int i);
....

A vector isn't very complicated to be implemented or just
use the existing sources of the classic vectors and
change the signature/underlying array.


Regards, Lothar
--
Lothar Kimmeringer E-Mail: (e-mail address removed)
PGP-encrypted mails preferred (Key-ID: 0x8BC3CD81)

Always remember: The answer is forty-two, there can only be wrong
questions!

 

[Roedy Green]

Can I convert a vector to double[], or is there a quick conversion from
Double[] to double[]?

see http://mindprod.com/converter.html for how to interconvert Double
and double (or anything else).

Then put it in a loop. Allocate a new array of the correct type and
size before you start.