Трамп высказался о непростом решении по Ирану09:14
use int if you have a small number of classes,
，这一点在heLLoword翻译官方下载中也有详细论述
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When using the probability matrix to pick from the candidate set, it is important that the candidate array be sorted in advance. Not doing so will fail to preserve the patterns distinctive of ordered dithering. A good approach is to sort the candidate colours by luminance, or the measure of a colour’s lightness4. When this is done, we effectively minimise the contrast between successive candidates in the array, making it easier to observe the pattern embedded the matrix.