Passing Matrix List to Java Method ,error:No method 'list_method' with matching signature found for class

Hi,

   On Matlab Part : 

           matrix =[22,11,33,44,22,44,22,54]; % 1-by-8 matrix 

if true
  % code
import edu.lipreading.*;
  import java.util.Vector;
  training = MainMethod;
  training.list_method(matrix);

end
On Java Part

if true
  % code
public  void list_method(List<Integer> points){
System.out.println("Welcome to List Method");
}
end

Note : When I have run my matlab code i got error like No method 'list_method' with matching signature found for class 'edu.lipreading.MainMethod'. // edu.lipreading Package Name ,MainMethod Class name

[SAMEER ahamed]

I have already asked look @ Passing List ,still awaiting for result .if any body know please let me know Thanks.

Answer 1

[Malcolm Lidierth]

Try

public  void list_method(double[] points){
...
}

Note that MATLAB vectors/matrices contain doubles by default and are passed to Java as a copy.

[SAMEER ahamed]

Thank's for reply me , my java code i need add list Items like

on Java Code :

   public void list_method(List<Integer> points){
  Sample recordedSample = new Sample ();
  recordedSample.getMatrix().add(points);
  }

on Matlab I have multiple dynamic matrices list values so i wanna need to add list method .

Example : matrix =[33,5,45,2,4,2,1,1]
                  [3,2,2,5,3,2,2,2]; etc.

[SAMEER ahamed]

When I have change from java method argument List to double again i have got error below like

    if true
      % code
  matrix
  [12,34,113,34,61,1,61,66]
  No method 'list_method' with matching signature found for class
  'edu.lipreading.MainMethod'.
    end

[SAMEER ahamed]

When I have change from java method argument List to double again and again i have got error below like . Please reply me any idea ? thanks . please review previous forum for understanding ?

    if true
      % code
  matrix
  [12,34,113,34,61,1,61,66]
  No method 'list_method' with matching signature found for class
  'edu.lipreading.MainMethod'.
    end

Answer 2

[Malcolm Lidierth]

OK, if you are stuck with a List java-side, you need to create a list MATLAB-side.

In MATLAB:

• Create a concrete list class

list=java.util.ArrayList()

• Add the elements to it

for k=1:length(matrix)
list.add(int32(matrix(k)));
end

• Check its size:

>> list.size()

ans =

     8

Note that the "<Integer>" annotation in your Java code is only relevant at compile time. Casting the MATLAB variable to int32 above ensures that the ArrayList will add a java.lang.Integer to the list at run-time. You could do that explicitly using

list.add(java.lang.Integer.valueOf(matrix(k)));

instead.

Within MATLAB you can access the list elements using "get":

e.g.

list.get(0)

Note that when MATLAB receives the returned Integer, it creates a MATLAB primitive double from it:

>> class(list.get(0))

ans =

double

Java will not - it will use the java.lang.Integer instance in the list.

[SAMEER ahamed]

Thanks for reply me below i have mentioned my full code , u can easily solve my issues.

On Matlab code-side

matrix =[33,122,3,2,2,3,2,4];
outsprintf=sprintf('%d,',matrix);
outsprintf=sprintf('[%s\b]',outsprintf);
disp(outsprintf);

here result is [33,122,3,2,2,3,2,4] like getting so this values i need to pass java method arguments List<Integer> points.

Note 2:About Java Class Please Look at my Attached file .