If condition with a cell include both number string and text string?

Question

Khanh 2014-10-21

0
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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/159542-if-condition-with-a-cell-include-both-number-string-and-text-string

评论： Khanh 2014-10-22

采纳的回答： Robert Cumming

在 MATLAB Online 中打开

Hi everyone,

I have a cell:

mycell ={'text','-1','0','','textnumber01234','3123','0.111'}

I'm trying using if condition for showing a error window with each value of each cell element except two last elements ('3123','0.111'). These string elements which are converted to number by str2double have values greater than 0.

mycell={'text','-1','0','','text-with-number01234','3123','0.111'}
for ii=1:length(mycell)
    if strcmp(mycell(ii),'') || str2num(mycell(ii))<=0 || isempty(mycell(ii))
        % --- FIGURE -------------------------------------
    figure1= figure( ...
      'Tag', 'figure1', ...
      'Units', 'pixels', ...
      'Position', [515 655 310 90], ...
      'Name', 'Wrong format data', ...
      'MenuBar', 'none', ...
      'NumberTitle', 'off', ...
      'Color', [0.941 0.941 0.941]);
    % --- STATIC TEXTS -------------------------------------
        uicontrol( ...
      'Parent', figure1, ...
      'Tag', 'text1', ...
      'Style', 'text', ...
      'Units', 'pixels', ...
      'Position', [25 17 250 50], ...
      'FontSize', 10, ...
      'String', {'Please enter right format data'}, ...
      'HorizontalAlignment', 'left');
        return
    end
end

My code doesn't work properly.

Could someone help me?

Thanks.

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Answer 1

Robert Cumming 2014-10-21

1
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/159542-if-condition-with-a-cell-include-both-number-string-and-text-string#answer_156075

编辑：Robert Cumming 2014-10-21

在 MATLAB Online 中打开

The problem here is the use of str2num in your conversion and the fact one of your inputs is text (which is a matlab function name which returns a handle), try:

str2num ( 'text' )

the result may surprise you....

the quirky result is because str2num uses eval. - str2double is generally a much better solution, with that in mind see below:

 mycell={'text','-1','0','','text-with-number01234','3123','0.111'};
 index = cellfun ( @str2double, mycell );
 flags = ~(isnan(index) + index>0);
 for ii=1:length(mycell)
    if flags(ii)
        % --- FIGURE -------------------------------------
    figure1= figure( ...
      'Tag', 'figure1', ...
      'Units', 'pixels', ...
      'Position', [515 655 310 90], ...
      'Name', 'Wrong format data', ...
      'MenuBar', 'none', ...
      'NumberTitle', 'off', ...
      'Color', [0.941 0.941 0.941]);
    % --- STATIC TEXTS -------------------------------------
        uicontrol( ...
      'Parent', figure1, ...
      'Tag', 'text1', ...
      'Style', 'text', ...
      'Units', 'pixels', ...
      'Position', [25 17 250 50], ...
      'FontSize', 10, ...
      'String', {'Please enter right format data'}, ...
      'HorizontalAlignment', 'left');
        return
    end
 end