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2023年10月11日签到记录贴 - 签到区 - 清泛IT社区，为创新赋能！
...另外我还额外获得了 小红花 10.我今天最想说:「每天就是123」.
2023年10月12日签到记录贴 - 签到区 - 清泛IT社区，为创新赋能！
...花 8,另外我还额外获得了 小红花 10.我今天最想说:「天天123」.
2023年10月14日签到记录贴 - 签到区 - 清泛IT社区，为创新赋能！
...花 7,另外我还额外获得了 小红花 10.我今天最想说:「天天123」.
2023年12月29日签到记录贴 - 签到区 - 清泛IT社区，为创新赋能！
...另外我还额外获得了 小红花 10.我今天最想说:「每天就是123」.
Bad arguments to +：The operation + cannot accept the arguments:, [&qu...
...符串，不能有效地转换成数字，所以报错。
比如"123"这个字符串可以自动转数字，但是空文本不行。
文本要判断空，然后给数字 0。
同理，空文本不但不能转数字，也不能转列表、字典等数据类型，否则都会发...
Sorting 1 million 8-decimal-digit numbers with 1 MB of RAM
...swer or the later answer with arithmetic encoding. Below you may find some fun, but not a 100% bullet-proof solution.
This is quite an interesting task and here is an another solution. I hope somebody would find the result useful (or at least interesting).
Stage 1: Initial data structure, rough co...
What is the best comment in source code you have ever encountered? [closed]
... The first time I've ever been truly RickRolled - and it was funny. When I see links to YouTube I always expect to be RickRolled (camel cased English!!), but I never never never expected to be RickRolled in code comments.
– Vincent McNabb
Jul 28 '...
How do I dump an object's fields to the console?
...
Using introspection is part of the fun of Ruby. It's often useful to subtract an Object's instance_methods from the class' in question to get the methods that are unique: (String.instance_methods - Object.instance_methods).sort
– the Tin ...
Numbering rows within groups in a data frame
...
Use ave, ddply, dplyr or data.table:
df$num <- ave(df$val, df$cat, FUN = seq_along)
or:
library(plyr)
ddply(df, .(cat), mutate, id = seq_along(val))
or:
library(dplyr)
df %>% group_by(cat) %>% mutate(id = row_number())
or (the most memory efficient, as it assigns by reference w...
How to apply multiple transforms in CSS?
...ct the 4x4 matrix yourself
I grabbed the following image from some random site I found while googling which shows rotational matrices:
Rotation around x axis:
Rotation around y axis:
Rotation around z axis:
I couldn't find a good example of translation, so assuming I remember/understand it rig...