X Y scatter data Color Contour of Frequency Distribution spatially in 125km circle

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Utsav
Utsav 2016-2-4
评论： Utsav 2016-2-12
I have X-Y scatter data. I plotted Frequency Distribution spatially with 5km box resolution, I need values outside 125km radius to show white instead of 0. I understand NaN is the option. How do I implement NaN selectively through code
my code is
binmin = -125; binmax = 125; binwidth = 5;
xbin = 1 + floor((X(:) - binmin) / binwidth);
ybin = 1 + floor((Y(:) - binmin) / binwidth);
nbins = ceil((binmax - binmin) / binwidth);
counts = accumarray([xbin, ybin], 1, [nbins, nbins]);
figure(1)
surf(counts,'EdgeColor','none','LineStyle','none');
view(-270,-90);
any help shall be appreciated

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回答（1 个）

Walter Roberson
Walter Roberson 2016-2-4
  1 个评论
Utsav
Utsav 2016-2-12
Thats okay, circlePixels will produce an array of 0 and 1. \ But I have some embedded zero within the circle of 1 too as well as outside How to selectively filter out the outside zeros.

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