Writing a function that can take a financial time series or a vector

Question

Doug 2012-3-25

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/33369-writing-a-function-that-can-take-a-financial-time-series-or-a-vector

I am new to Matlab, and I trying to write a function that can accept either a financial time series or a vector. Something like:

   function y = mydiff(x)
      if istimeseries(x)
         vec = fts2mat(x.CLOSE);
      else
         vec = x;
      end
      y = diff(vec);
   end

I'm at a loss, however, on what to put in place of the istimeseries test. Is this possible?

Thanks in advance for the help.

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Answer 1

Rick Rosson 2012-3-25

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https://ww2.mathworks.cn/matlabcentral/answers/33369-writing-a-function-that-can-take-a-financial-time-series-or-a-vector#answer_41956

在 MATLAB Online 中打开

   if isa(x,'timeseries')
       ...
   else
       ...
   end

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Doug 2012-3-25

That worked like a charm. For the record, the class for a financial time series appears to be 'fints' and not 'timeseries' as I had assumed.

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