Questions tagged [norm]
NoRM is a MongoDB driver for .Net designed to provide access to strongly/statically-typed documents and collections.
norm
142
questions
83
votes
2
answers
20k
views
Too much data duplication in mongodb?
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 ...
- 831
29
votes
9
answers
31k
views
MongoDB transactions in .NET in 2010?
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 of ...
- 46.6k
28
votes
5
answers
75k
views
Get the 1-norm of a vector in Python
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
dhiv
26
votes
7
answers
9k
views
What is the most mature MongoDB driver for C#?
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 they ...
- 1,580
22
votes
3
answers
17k
views
When to use Singleton vs Transient vs Request using Ninject and MongoDB
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 the ...
- 6,893
12
votes
2
answers
13k
views
When should i be opening and closing MongoDB connections?
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.
...
- 5,836
10
votes
4
answers
24k
views
How should I normalize a vector in Matlab where the sum is 1?
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 vector
...
- 15k
9
votes
5
answers
5k
views
How to pass ObjectId from MongoDB in MVC.net
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 :
...
- 6,893
8
votes
2
answers
5k
views
linalg.norm not taking axis argument
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, axis=1)...
- 681
8
votes
4
answers
1k
views
MongoDB, C# and NoRM + Denormalization
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 problem....
- 20.5k
7
votes
4
answers
15k
views
Norm of a arrays of vectors in python
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, ...
- 14.5k
7
votes
2
answers
432
views
Interpreting the effect of LK Norm with different orders on training machine learning model with the presence of outliers
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. Generally ...
- 2,312
6
votes
3
answers
5k
views
Get norm of numpy sparse matrix rows
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')
...
- 3,935
6
votes
5
answers
16k
views
How to calculate Euclidean length of a matrix without loops?
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 ...
- 2,405
5
votes
2
answers
16k
views
Normalizing rows of matrix, so that their norm is equal to 1 (MATLAB)
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,:))==1)
...
- 2,440
5
votes
2
answers
817
views
Compute distance in Cartesian Coordinate System in Mathematica
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 use ...
- 6,569
5
votes
2
answers
534
views
Polymorphism problem in MongoDb with NoRM driver
I have classes
[MongoDiscriminated]
public abstract class Content
{
public int? Id { get; set; }
public int? ParentId { get; set; }
public string Slug { get; set; }
public string Path ...
- 1,898
4
votes
2
answers
6k
views
Lazy loading in MongoDB with NoRM
I have a model similar to this:
(simplified)
Question:
public class Question
{
public string QuestionID { get; set; }
public string Title { get; set; }
public string Body { get; set; }
...
- 37.9k
4
votes
3
answers
2k
views
c# MongoDB (noRM) - Repository pattern with embedded documents
I’m developing an application with a model similar to Stack Overflow (question / answer etc...)
Modelling a NoSQL Forum Application with C# / ASP.net MVC
The model looks something like this (...
- 37.9k
4
votes
1
answer
2k
views
Sort (symmetric) numpy 2D array by function. (norm)
How to sort a matrix by the norm of its rows efficiently(using numpy.ndarrays)?
I want to sort the matrix A:
A = np.array( ( [ 10, 1, 6, 3 ],
[ 1,12, 2, 4 ],
[ 6, 2,...
- 740
4
votes
1
answer
6k
views
How to store nested objects in different mongodb collection?
I need to store some objects of this classes:
public class Category{
public ObjectId Id {get;set;}
public string Name {get;set;}
public string Description {get;set;}
public List<...
- 45
4
votes
1
answer
1k
views
Mongo one to many relation and update problems
I'm implementing blog based on MongoDB.
Let's look at first how Mongo guys recommend us to store blog post and its comments (http://www.mongodb.org/display/DOCS/Schema+Design):
posts should be a ...
- 24.9k
4
votes
2
answers
1k
views
MongoDB Norm query nested objects
Does anyone have a sample of how to query for nested/inner objects in MongoDB using NORM (C#)? For example, if a typical document in a collection looks like Order/OrderItems, how can I look up a ...
- 165
3
votes
1
answer
18k
views
Calculating the norm of each row in a matrix [duplicate]
I have a Nx3 matrix (A) the columns are X,Y,Z respectively. I want to calculate the norm that is sqrt(X^2+Y^2+Z^2) for each row. I did a for loop for that:
for i = 1:length(A)
Result(i) = norm(A(i,:)...
- 881
3
votes
2
answers
1k
views
Modelling a NoSQL Forum Application with C# / ASP.net MVC
I'm currently developing a Forum (Question / Answer) based application.
Using C# ASP.net MVC and MongoDB for data storage.
I'm currently looking at the model.
I was thinking of having separate ...
- 37.9k
3
votes
1
answer
3k
views
MongoDB - Hosting on multiple servers
I am wanting to use MongoDB on my Windows Server and I am using the .NET code at:
https://github.com/atheken/NoRM/wiki/
I have 2 web servers that I need to host MongoDB on and keep the database on ...
- 10.9k
3
votes
1
answer
748
views
Implementing a blog with MongoDB and NoRM: Relationships?
I'm starting to learn MongoDB, using the NoRM C# driver in an ASP.NET MVC project. I'm just writing POCO classes right now, and have question on how to implement relationships between Blog Posts, ...
- 5,039
3
votes
1
answer
64
views
Discretized function becomes complex while free propagating a real function when sampled at even number of points using FFT and IFFT in Python
My code involves propagation of a real function using Fourier transform and inverse Fourier transform. Specifically, the function evolves as
∂ψ(z,t)/∂t - v ∂ψ(z,t)/∂z =0
I solve this problem by ...
- 33
3
votes
1
answer
184
views
Numerical problems with qnorm
I'm having a numeric issue using qnorm(psn()). The problem is numeric.
Firstly, the Skew-Normal CDF round the result, since psn(9) is not 1:
library(sn)
psn(9)
#[1] 1
then
qnorm(psn(9))
#[1] Inf
...
- 693
3
votes
2
answers
697
views
Using the HiLoIdGenerator in NoRM for MongoDB to create a unique identifier
I have been struggling a little with the HiLoIdGenerator that comes with NoRM (http://normproject.org/); I want to use it to generate a unique identifier that I can use as a SLUG for my blog posts. At ...
- 463
3
votes
1
answer
104
views
Problems with MATLAB nested statements and bisection
New to the site, but I'm trying to hone up on some MATLAB skills for work and school, and was looking for some help with the following:
I want to write my own algorithm for finding the Hinf norm of a ...
3
votes
1
answer
966
views
MongoDb NORM - Pagination and Total Documents
Using the MongoDb NORM driver, does anyone know whether it's possible to get the cursor to a 'queried' collection similar to below, so that a 'page' of documents can be retrieved as well as the total ...
- 57
3
votes
1
answer
3k
views
Storing multiple types of objects in one collection in MongoDB using NoRM
MongoDB is schema-less. So, I can technically store any number of different types within one collection. We currently have the need to store multiple objects that inherit from the same base class in ...
- 4,779
3
votes
1
answer
654
views
How to do an order by not case sensitive
I'm starting to work with MongoDB and NoRM and I would like to do an orderBy that is not Ccase sensitive, is it possible?
Thanks for the help!
- 6,893
2
votes
1
answer
2k
views
What is the difference between a Metric and a Norm?
From my understanding, a metric defines a more abstract entity than a norm, but I don't feel like I truly understand. Can someone please explain it to me in layman's terms?
- 1,442
2
votes
1
answer
2k
views
tf.norm error ValueError: 'ord' must be a supported vector norm, got fro
I am trying to calculate the Frobenius Norm of my tensor
W = tf.Variable(tf.random_normal([3072,20],stddev=0.1))
temp = tf.matmul(tf.transpose(W),W)
fro_W = tf.norm(temp, ord ='fro')
This produces ...
- 381
2
votes
2
answers
587
views
normrnd() and norm() operations without "for loop"
I have been searching around to write the following code without the "for loop". I have looked into array operations such as bsxfun(),arrayfun, or other MATLAB built-in functions but could not really ...
- 260
2
votes
3
answers
1k
views
How can I use mongodb with linq for store large binary objects(files)?
I know two most popular C# drivers for mongodb, this are mongodb-csharp and NoRM. Both of them have some problems. For example, with mongodb-csharp I can't use full functional linq and with NoRM I can'...
- 6,699
2
votes
1
answer
214
views
Matrix of norm differences from two coordinates matrices (numpy)
Let v, u be the 3D-coordinate matrices of shapes (n, 3) and (m, 3), respectively.
I want to compute the matrix M of shape (n, m) such that M[i, j] = ||v[i] - u[j]|| -- the second vector norm. The task ...
- 45
2
votes
1
answer
6k
views
Normalize.css does not fully add reset to react app
I'm following the instructions on Reacts official site here. I have an index.css file setup in the root of my src directory with the import as the say:
@import-normalize;
I then import the index.css ...
- 14.1k
2
votes
2
answers
624
views
Python Numpy Question and Python Version Question
I want to use Numpy with Python 3.2 and it won't work; it says I need 3.1. Does anyone know how to get around this issue, other than using 3.1? What do I have to import in order to make this work in a ...
- 646
2
votes
1
answer
211
views
How to make a change in a numeric solution to an ODE after it has been solved?
I have two Second Order ODE's of which I want to calculate the error between them using (with Maple)
|| B(t) - A(w*t) || = sqrt(int(B(t) - A(w*t) )^2), t = 0..T)
Where A(t) is the solution to the ...
2
votes
1
answer
7k
views
looking for a 3D version of numpy.linalg.norm
I'm looking for a build-in function in python. It should compute the frobenius norm of a 3D array.
My current approach is:
np.sqrt(np.sum(np.square(x[:,:,:])))
but this is too slow for the size ...
- 424
2
votes
2
answers
1k
views
Mongodb NoRM and POCO
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 ...
- 4,997
2
votes
1
answer
2k
views
Any Differences in `cvxpy` Library Between L2 Norm and `sum_of_square()`?
I am trying to use cvxpy lib to solve a very simple least square problem. But I found that cvxpy gave me very different results when I use sum_squares and norm(x,2) as loss functions.
The same ...
- 21
2
votes
1
answer
1k
views
how to store files using MongoDb C# Norm
Can someone help me with a complete sample how to store a file using MongoDB, C# and Norm and manage the limitation size. I have read some ideas about but is not really clear for me.
Thanks.
- 1,423
2
votes
2
answers
1k
views
how to add new field in mongodb, if i use norm or csharp-mongodb drivers
I have two projects which are based on mongodb database. One project use csharp-mongodb and another - norm driver.
I make request to my db only with generic methods like GetCollection.
How can i add ...
- 705
2
votes
0
answers
526
views
How to normalize matplotlib colormap on Natural Logarithm scale
I would like to use imshow for plotting a matrix whose elements are in [1, 64]. To normalise the colormap, I could only find "LogNorm", however, I need something like "LnNorm", normalising the matrix ...
- 771
2
votes
1
answer
282
views
normalization of the same vector gives different values at two cases?
r_capr
Out[148]: array([[-0.42300825, 0.90516059, 0.04181294]])
r_capr
np.linalg.norm(r_capr.T)
Out[149]: 0.99999999760432712
a.T
Out[150]: array([[-0.42300825, 0.90516059, 0.04181294]])
a....
- 551
1
vote
2
answers
9k
views
Norm function in OpenCV
How can I take easily norm of an array?
I tried this and I have an error:
too many initializers error C2440: 'initializing' : cannot convert
from 'cv::OutputArray (__cdecl *)(void)' to 'double'
...
- 73