restricting get method to not process all the values

I have a get method that calulates a 2-d matrix based on data in a 3d-matrix. This calculation takes some time to perform if I have allot of data in the object.

function out = get.FWHM(obj)
    for RowNo=1:obj.NRows
        for ColumnNo=1:obj.NColumns
            out(RowNo,ColumnNo)=fwhmFunctionGivingSingleValueOut( obj.Data(RowNo,ColumnNo,:) );
        end
    end
end

I've tried to restrict the rows and columns to be process, when I dont need to have all the values calculated, like this:

function out = get.FWHM(obj,RowIND,ColIND)
    for RowNo=RowIND
        for ColumnNo=ColIND
            out(RowNo,ColumnNo)=fwhmFunctionGivingSingleValueOut( obj.Data(RowNo,ColumnNo,:) );
        end
    end
end

But Matlab doesnt like that. In principle I could place some property in the obj that keep strack of the rows and columns to operate on, but that does not seem like the best way to do it

What is the best way to restrict the get-method to only process some of the values?

Answer 1

[Matt J]

There doesn't seem to be a good reason for this to be a get method. Just use a regular method.

function out = FWHM(obj,RowIND,ColIND)
    for RowNo=RowIND
        for ColumnNo=ColIND
            out(RowNo,ColumnNo)=fwhmFunctionGivingSingleValueOut( obj.Data(RowNo,ColumnNo,:) );
        end
    end
end

[Micke Malmström]

Of course! Thanks!