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App Inventor 2开发简单计算器 - App Inventor 2 中文网 - 清泛IT论坛，有思想、有深度
...就会出现一些莫名其妙的状况，这里要讲解的是一个只有20个按键的简易计算器，实现了加减乘除的简单运算，以及清除、回退、求相反数等，如图2-1所示，更为复杂的运算，如求乘方、方根及三角函数的运算，可以利用开发工...
Is there a way to detect if an image is blurry?
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12 Answers
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Are 2^n and n*2^n in the same time complexity?
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232
You will have to go to the formal definition of the big O (O) in order to answer this question...
Why does 2 mod 4 = 2?
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Mod just means you take the remainder after performing the division. Since 4 goes into 2 zero ti...
Dynamically update values of a chartjs chart
... on a line chart: http://jsbin.com/yitep/4/edit
Original Post
As of Nov 2013, there seem to be very few options for updating charts.
There is a good example here (duplicated below) of adding new points to a line chart. Still kind of jumpy but not too bad. However, I think the effect probably...
Ruby Bundle Symbol not found: _SSLv2_client_method (LoadError)
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I just fixed a similar issue on my system. You need to rebuild your install of Ruby 2.1.2 and ...
How to convert float to int with Java
...ted May 7 '15 at 18:03
user719662
answered Aug 18 '09 at 17:41
tw39124tw39124
8,00722 ...
Applying a function to every row of a table using dplyr?
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As of dplyr 0.2 (I think) rowwise() is implemented, so the answer to this problem becomes:
ir...
Summarizing multiple columns with dplyr? [duplicate]
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The dplyr package contains summarise_all for this aim:
library(dplyr)
df %>% group_by(grp) ...