How can I calculate the 1-norm of the difference of two vectors, ||a - b||_1 = sum(|a_i - b_i|) in Python? a = [1,2,3,4] b = [2,3,4,5] ||a - b||_1 = 4

Both the RMSE and the MAE are ways to measure the distance between two vectors: the vector of predictions and the vector of target values. Various distance measures, or norms, are possible. General...

Playing around with MongoDB and NoRM in .NET. Thing that confused me - there are no transactions (can't just tell MongoConnection.Begin/EndTransaction or something like that). I want to use Unit ...

I need to normalize a vector of N integers so that: Each value is proportional to its original value (the value will be between 0 and 1) The sum of all values is =1 For instance: If I have a v...

I have this array A = array([[-0.49740509, -0.48618909, -0.49145315], [-0.48959259, -0.48618909, -0.49145315], [-0.49740509, -0.47837659, -0.49145315], ..., [ 0.03079315, -0.01194593, -0.068...

I have a sparse matrix that I obtained by using Sklearn's TfidfVectorizer object: vect = TfidfVectorizer(sublinear_tf=True, max_df=0.5, analyzer='word', vocabulary=my_vocab, stop_words='english') ...

It seems like the answer to this should be simple, but I am stumped. I have a matrix of Nx3 matrix where there 1st 2nd and 3rd columns are the X Y and Z coordinates of the nth item. I want to calcu...

I'm starting a new project with Mongo, NoRM and MVC .Net. Before I was using FluentNHibernate so my IDs were integer, now my IDs are ObjectId. So when I have an Edit link my URL looks like this : ...

I'm not quite sure when I should use SingletonScope() vs TransientScope() vs RequestScope() when I do my binding in my global.cs file. I have for example my call to MongoSession (using NoRM and th...

So, there are mongodb-csharp simple-mongodb NoRM as C# drivers for MongoDB available. Which one of them is the most mature and stable one? Why would you choose one over the other two? Are th...

i am very new to MongoDB and NoSQL in general and i've just started building a site with MongoDB / Norm / ASP.NET MVC 3. I am wondering how i should be scoping the connections to my Mongo database...

I am using Python 3 within Pyzo. Please could you tell me why the linalg.norm function does not recognise the axis argument. This code: c = np.array([[ 1, 2, 3],[-1, 1, 4]]) d=linalg.norm(c, axi...

I have a following problem - I have a matrix A of size 16x22440. What I need to do is to normalize each row of this matrix, so that the norm of each of them is equal to 1 (for n=1:16 norm(A(n,:))=...

I am experimenting with Mongodb and NoRM in C#. From what I have read the ObjectId that uniquely identifies a document in Mongodb is a sort of "special" Guid (in the sense that is unique) but has ...

I am trying to use MongoDB, C# and NoRM to work on some sample projects, but at this point I'm having a much harder time wrapping my head around the data model. With RDBMS's related data is no prob...

Analyzing Eye-movements on a screen, I set my origin to the bottom left corner of it (Hard to modify at that point). Trying to compute distance between some points and the center of the screen I ...

What are the best solution to preserve left joins in a NoSQL solutions like MongoDB/Norm if you can not modify the complete architecture of one cms. Experiences, Samples, Cost. Thanks.

I'm new to this whole NOSQL stuff and have recently been intrigued with mongoDB. I'm creating a new website from scratch and decided to go with MONGODB/NORM (for C#) as my only database. I've been ...