大约有 4,761 项符合查询结果（耗时：0.0416秒） [XML]
Check if a value is within a range of numbers
I want to check if a value is in an accepted range. If yes, to do something; otherwise, something else.
7 Answers
...
Cosine Similarity between 2 Number Lists
I need to calculate the cosine similarity between two lists , let's say for example list 1 which is dataSetI and list 2 which is dataSetII . I cannot use anything such as numpy or a statistics module. I must use common modules (math, etc) (and the least modules as possible, at that, to reduc...
Inserting a Python datetime.datetime object into MySQL
I have a date column in a MySQL table. I want to insert a datetime.datetime() object into this column. What should I be using in the execute statement?
...
How to remove a single, specific object from a ConcurrentBag?
With the new ConcurrentBag<T> in .NET 4, how do you remove a certain, specific object from it when only TryTake() and TryPeek() are available?
...
reducing number of plot ticks
I have too many ticks on my graph and they are running into each other.
7 Answers
7
...
How do I replace NA values with zeros in an R dataframe?
...
See my comment in @gsk3 answer. A simple example:
> m <- matrix(sample(c(NA, 1:10), 100, replace = TRUE), 10)
> d <- as.data.frame(m)
V1 V2 V3 V4 V5 V6 V7 V8 V9 V10
1 4 3 NA 3 7 6 6 10 6 5
2 9 8 9 5 ...
Why can't I access DateTime->date in PHP's DateTime class?
Using the DateTime class, if I try to run the following code:
5 Answers
5
...
How can I repeat a character in Bash?
...
You can use:
printf '=%.0s' {1..100}
How this works:
Bash expands {1..100} so the command becomes:
printf '=%.0s' 1 2 3 4 ... 100
I've set printf's format to =%.0s which means that it will always print a single = no ma...
Ignore mapping one property with Automapper
...utomapper and I have the following scenario:
Class OrderModel has a property called 'ProductName' that isn't in the database.
So when I try to do the mapping with:
...
How is Math.Pow() implemented in .NET Framework?
I was looking for an efficient approach for calculating a b (say a = 2 and b = 50 ). To start things up, I decided to take a look at the implementation of Math.Pow() function. But in .NET Reflector , all I found was this:
...