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灰度图中找出深色像素并给出坐标 · App Inventor 2 中文网
...、蓝、透明度四个数；灰度图的三个颜色分量相等，第 1 项就是灰度值（0 最黑，255 最白）；
颜色抽屉的「是深色吗」：直接判断一个颜色是不是深色。
思路：取颜色 → 算灰度 → 和阈值比较。灰度小于阈值就算深色，阈...
How can I plot with 2 different y-axes?
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update: Copied material that was on the R wiki at http://rwiki.sciviews.org/doku.php?id=tips:g...
Ruby - elegantly convert variable to an array if not an array already
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Set every cell in matrix to 0 if that row or column contains a 0
Given a NxN matrix with 0s and 1s. Set every row that contains a 0 to all 0 s and set every column that contains a 0 to all 0 s.
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Downloading jQuery UI CSS from Google's CDN
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The Google AJAX Libraries API, which includes jQuery UI (currently v1.10.3), also includes popular themes as per the jQuery UI blog:
Google Ajax Libraries API (CDN)
Uncompressed: http://ajax.googleapis.com/ajax/libs/jqueryui/1.10.3/jquery-ui.js
Compressed: http://ajax.googleapis.com/ajax/l...
How to convert floats to human-readable fractions?
Let's say we have 0.33 , we need to output 1/3 .
If we have 0.4 , we need to output 2/5 .
26 Answers
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Programmatically obtain the Android API level of a device?
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You can obtain API level programatically by the system constant (Build.VERSION.SDK_INT). For e...
How to round up to the nearest 10 (or 100 or X)?
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