Convert java.util.HashMap keys to vector in Matlab

Question

I have a HashMap object that contains key=>value set which are both integers.

F = java.util.HashMap;
F.put(1, 123);
F.put(3, 432);
F.put(7, 31);

I need to extract keys to the vector. I access keys with:

F.keySet.toArray

It returns Object:

ans =

java.lang.Object[]:
    [1]
    [3]
    [7]

How to convert it to vector ?

[1 3 7]

what is a regular vector? can you explain please?

Juvanis
– Juvanis

2012-11-17 14:07:05 +00:00
Commented Nov 17, 2012 at 14:07 — Juvanis
– Juvanis, Commented Nov 17, 2012 at 14:07
I mean standard vector like [1 3 7]

hsz
– hsz

2012-11-17 14:07:44 +00:00
Commented Nov 17, 2012 at 14:07 — hsz
– hsz, Commented Nov 17, 2012 at 14:07

Eastsun · Accepted Answer · 2012-11-17 14:41:30Z

4

You may try as following:

>> F = java.util.HashMap;
F.put(1, 123);
F.put(3, 432);
F.put(7, 31);
>> vec = cell2mat(F.keySet.toArray.cell)
vec =
     3
     7
     1
>> whos
  Name      Size            Bytes  Class                 Attributes

  F         1x1                    java.util.HashMap               
  ans       0x0                 0  double                          
  vec       3x1                24  double                          
  z         3x1                    java.lang.Object[]

answered Nov 17, 2012 at 14:41

Eastsun

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Comments

Mukul Goel · Accepted Answer · 2012-11-17 14:14:44Z

0

is this what you looking for?

Vector V=new Vector();
for(int i=0;i<3;i++)
V.add(ans[i]);

where ans is the Object[] that you have?

answered Nov 17, 2012 at 14:14

Mukul Goel

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