Why isn't this value being saved using ismember and round?

Question

Wolfgang McCormack 2021-3-13

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https://ww2.mathworks.cn/matlabcentral/answers/771983-why-isn-t-this-value-being-saved-using-ismember-and-round

回答： Star Strider 2021-3-13

采纳的回答： Star Strider

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Hi all,

I have the following code and it almost works for all my values except two. Nothing being saved in Xsaved

   AllRatios = ([0.1:0.05:1])
   %it does not work for the following ratios:  0.45 and 0.65. I wonder if
   %that's because thry are less than 0.45 and are rounded or not!
   
Actualvalue = 0.448533333333333
CurRatio= round(Actualvalue,2) % it returns 45, I tried it with 'significant' method as well
for i = 62:62
           if ismember(CurRatio,AllRatios)
            Xsaved(1,i) = ([CurRatio])
               
        else
NoSaved = 0
        end
   end

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Answer 1

Star Strider 2021-3-13

1
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https://ww2.mathworks.cn/matlabcentral/answers/771983-why-isn-t-this-value-being-saved-using-ismember-and-round#answer_647088

Since decimal fractions are never exact (even using round), use ismembertol (introduced in R2015a) for the comparisons. It will be necesary to experiment with the tolerance value to get it to work as desired.