Simple string to number help; how to convert this into a number?

Question

Nick Kabourek 2015-2-25

0
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https://ww2.mathworks.cn/matlabcentral/answers/180182-simple-string-to-number-help-how-to-convert-this-into-a-number

编辑： Hikaru 2015-2-25

I'm not sure how I would convert the string into a number for this part of my program;

   H1 = inputdlg('Number of rows');
%not sure how to get H1 to a number
   if H1 <=0
     H1 = inputdlg('Positive number of rows');
   else
     numRows = (H1);
   end

*Undefined function 'le' for input arguments of type 'cell'.*

trying to get H1 as a positive number but this error keeps showing up because it is a string

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Answer 1

Hikaru 2015-2-25

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https://ww2.mathworks.cn/matlabcentral/answers/180182-simple-string-to-number-help-how-to-convert-this-into-a-number#answer_169196

编辑：Hikaru 2015-2-25

在 MATLAB Online 中打开

Assuming that H1 contains only one value, you could use

     n = H1{1} % to access that value in the cell
     if c <=0
      c = inputdlg('Positive number of rows');
     else
       numRows = (c); %note that numRows is stored as 'char'
     end