When using scatter, how can I delete all the repeated values except the minimum for each x value?

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Lance Noel 2015-6-17

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https://ww2.mathworks.cn/matlabcentral/answers/224328-when-using-scatter-how-can-i-delete-all-the-repeated-values-except-the-minimum-for-each-x-value

评论： Lance Noel 2015-6-18

I am plotting data that has more than one y value for every x value. I'm using scatter(x,y) to plot this, but I want to only show the minimum of each x value. Both x and y are 14641 x 1 vectors. Any suggestions?

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Answer 1

Walter Roberson 2015-6-18

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https://ww2.mathworks.cn/matlabcentral/answers/224328-when-using-scatter-how-can-i-delete-all-the-repeated-values-except-the-minimum-for-each-x-value#answer_183081

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[ux, iax, icx] = unique(x);
min_at_x = accumarray(icx, y, [], @min);
scatter(ux, min_at_x);

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Lance Noel 2015-6-18

编辑：Lance Noel 2015-6-18

I think that this worked, to a degree, but it's still not exactly what I want. See the image- essentially I only want the points at the bottom edge of that "curve". So there might be a min that's substantially higher than its neighboring min's that I would want to delete. I guess there's another step involved.

Lance Noel 2015-6-18