How to fix this problem?

Question

Julius Rinaldi Simanungkalit 2020-9-3

0
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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/588247-how-to-fix-this-problem

评论： Julius Rinaldi Simanungkalit 2020-9-3

function LihatData_Callback(hObject, eventdata, handles)
%% Tombol Lihat Data Testing
try
    data = get(handles.uitable1,'data');
    DataJ = str2double(data);%mengubah tipe data double dari cell ke bentuk float
    [baris, kolom] = size(DataJ);
    dataN = zeros(1,6);
    DataUji = str2num(get(handles.tfDataPengujian,'String'));
    th2=baris-DataUji+1;
    for x = 1:DataUji
        for y = 1:kolom
            dataN(x,y) = DataJ(th2,y);
            fprintf('\nData Testing Parameter Ke - %d Alternatif Ke - %d = %7.5f', y, th2, dataN(x,y));
        end
        th2=th2+1;
    end
    if all(cellfun(@isempty, data(:)))
        msgbox('Data Masih Kosong','Warning','warn');
    elseif isempty(DataUji)
        msgbox('Data Pengujian Tidak Boleh Kosong','Information','help');
    elseif all(~cellfun(@isempty, data(:))) && ~isempty(DataUji)
        fprintf('\nJumlah Data Pengujian = %d\n',DataUji);
        %dataNx = sprintfc('%7.5f', dataN);
        set(handles.uitable2,'data',dataN);
        set(handles.NaiveBayes, 'enable','on');
    end
catch exception
    msgbox(exception.identifier,'Error','error');
end

why i get NaN? and how to fix that?

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Answer 1

Walter Roberson 2020-9-3

0
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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/588247-how-to-fix-this-problem#answer_488932

Suppose that your input uitable is a cell array, and that the first column is character vectors, and the other columns are already numeric.

You str2double the entire cell array.

The first column has text that is not in the form of a number, so str2double converts it to nan.

If, hypothetically, the other entries are already numeric rather than character, then str2double would convert them to nan.

That is,str2double(123) does not look at the input and say "oh, it is already numeric, return it unchange!" : str2double would look at it and say that it is not a character vector or string() representing a valid number, and would return nan.