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What are the differences between concepts and template constraints?
...onstraints as appeared in Dlang or the new concepts-lite proposal for C++1y ).
3 Answers
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How to crop an image in OpenCV using Python
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It's very simple. Use numpy slicing.
import cv2
img = cv2.imread("lenna.png")
crop_img = img[y:y+h, x:x+w]
cv2.imshow("cropped", crop_img)
cv2.waitKey(0)
s...
how to check the dtype of a column in python pandas
...s to treat numeric columns and string columns. What I am doing now is really dumb:
6 Answers
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Scala list concatenation, ::: vs ++
Is there any difference between ::: and ++ for concatenating lists in Scala?
4 Answers
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multiple packages in context:component-scan, spring config
...following approach is correct:
<context:component-scan base-package="x.y.z.service, x.y.z.controller" />
Note that the error complains about x.y.z.dao.daoservice.LoginDAO, which is not in the packages mentioned above, perhaps you forgot to add it:
<context:component-scan base-package="...
Modular multiplicative inverse function in Python
Does some standard Python module contain a function to compute modular multiplicative inverse of a number, i.e. a number y = invmod(x, p) such that x*y == 1 (mod p) ? Google doesn't seem to give any good hints on this.
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C++ stl stack/queue 的使用方法 - C/C++ - 清泛网 - 专注C/C++及内核技术
...元素。
访问栈顶，如例：s.top()
判断栈空，如例：s.empty()，当栈空时，返回true。
访问栈中的元素个数，如例：s.size()。
2、queue
queue 模板类的定义在<queue>头文件中。
与stack 模板类很相似，queue 模板类也需要两个模板参数...
Imitate Facebook hide/show expanding/contracting Navigation Bar
... Facebook iPhone app, when the user scrolls up the navigationBar gradually hides itself to a point where it completely vanishes. Then when the user scrolls down the navigationBar gradually shows itself.
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Is there a way to automate the android sdk installation?
...AVD Manager, and then install the APIs, tools through the UI. Is there a way to automate this process?
12 Answers
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Background color of text in SVG
...not have background-... presentation attributes.
To simulate this effect you could draw a rectangle behind the text attribute with fill="green" or something similar (filters). Using JavaScript you could do the following:
var ctx = document.getElementById("the-svg"),
textElm = ctx.getElementById(...