Need help with 'Undefined function or method 'minus' for input arguments of type 'cell'

Question

Philip Spratt 2013-5-30

0
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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/77476-need-help-with-undefined-function-or-method-minus-for-input-arguments-of-type-cell

I can't understand why I keep getting this error. A similar script does not experience this. Below is the snippet of code causing the error. scan_acquisition_time is of char type. ScanValue is of double type.

Please can someone help?

    scan_acquisition_time = cellstr(num2str(MLTdata(2:end,3)/(1000*60),4)); % Convert to minutes
    lowestDifference = 9999999;
    lowestPos = 0;
    for i = 1:length(scan_acquisition_time)
       currentDifference = abs(scan_acquisition_time(i) - ScanValue);
       if currentDifference == 0
           nearestRT = i;
           break;
       else
           if currentDifference < lowestDifference
              lowestDifference = currentDifference;
              lowestPos = i;
           end
           % Check to see if this is the lowest
           nearestRT = lowestPos;
       end
    end