# How to compare exponential numbers with 7-9 digits of accuracy

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theblueeyeswhitedragon 2018 年 4 月 30 日
コメント済み: dpb 2018 年 4 月 30 日
I am creating a GUI that allows the user to delete data points from a graph by clicking on them. The method has been working for most types of graphs, but for plots that have X-values expressed in exponential form, for example, 7.371477206897944e+05, the code does not work. Also the data range is 7.371476 e+05 to 7.371478 e+05, which makes the elements' X-values really close to each other.
V = event.IntersectionPoint(1:2);
V(1) = V(1);
V(2) = round(V(2),2);
ChosenPointScatter = scatter(V(1), V(2), 'markerfacecolor', 'k', 'markeredgecolor', 'k','parent', subplotRemoval{2});
indx = find(cell{15}(:,1) == V(1));
indy = find(cell{15}(:,2) == V(2));
Basically, I am trying to find the matrix index numbers for the element that equals 7.371477206897944e+05, but I get an empty value for every data point I select. Can you suggest any method for comparing exponential numbers like the one presented?

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### 採用された回答

dpb 2018 年 4 月 30 日
doc ismembertol
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dpb 2018 年 4 月 30 日
It's a hard'un; there's no reason to think of that name for the purpose and there are very few links from places one might be in the documentation pointing to it...took me almost two years before I could reliably think of what it was named when wanted it.

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