dimension

问题 I want to handle a date dimension in a MySQL datawarehouse. (I m a newbie in the DW world) I made some searches with google and saw a lot of table structures (most of) date dimension where the Primary Key is a simple UNSIGNED INTEGER . Why don't use a DATE field as primary key since with MySQL it is 3 Bytes VS 4 Bytes for INTEGER ? Ex: CREATE TABLE dimDate id INTEGER UNSIGNED NOT NULL PRIMARY AUTOI_NCREMENT, date DATE NOT NULL, dayOfWeek ... VS CREATE TABLE dimDate date DATE NOT NULL PRIMARY,

问题 I want to handle a date dimension in a MySQL datawarehouse. (I m a newbie in the DW world) I made some searches with google and saw a lot of table structures (most of) date dimension where the Primary Key is a simple UNSIGNED INTEGER . Why don't use a DATE field as primary key since with MySQL it is 3 Bytes VS 4 Bytes for INTEGER ? Ex: CREATE TABLE dimDate id INTEGER UNSIGNED NOT NULL PRIMARY AUTOI_NCREMENT, date DATE NOT NULL, dayOfWeek ... VS CREATE TABLE dimDate date DATE NOT NULL PRIMARY,

问题 Im currently using the following function to load an image, however i could not figure out a way to find the width of the loaded image, which i intend to use before placing the next image using the same function. Note that q is a a variable (a number) which is used to load differant images. =X i need help obtainning the loaded image width... function LoadImage(q) { var imageLoader:Loader = new Loader(); var image:URLRequest = new URLRequest("GalleryImages/Album1/"+q+".jpg"); imageLoader.load

问题 Closed . This question is opinion-based. It is not currently accepting answers. Want to improve this question? Update the question so it can be answered with facts and citations by editing this post. Closed 5 years ago . I am trying to create an array in Fortran similar to a cell in MATLAB. Basically (for example) I am trying to create an array X(10) where the element X(1) is an array with dimension (20,2), X(2) is an array with dimension (25,2), etc. How can I do this? 回答1: The equivalent

问题 I am working on this game in Java, and I just rewrote all my window related code from being based on java.awt to javax.swing. Soon after, I realized that things were a bit more complicated now, and so i did some research and and found out how to draw things, how to set the size of a JFrame, etc. But for some reason, the size of my JFrame always goes 10 pixels beyond the size I've specified it to become. In this case, I wanted it to be 640 by 640 pixels. Here's my code: package chrononaut;

问题 I'm trying to make some geometric transformations (e.g. scale,shear) on an image already loaded in a bitmap object I then found a Built-in Matrix class in C# , I used it but I'm not sure on how to initialize a 2x2 matrix or a column vector etc. The 4th overloaded constructor forces me to enter 6 values representing 3x2 ,but that I don't want! I used this reference but couldn't find an answer https://msdn.microsoft.com/en-us/library/system.drawing.drawing2d.matrix(v=vs.110).aspx 回答1: As

问题 I am trying to set my function f as an array, but I get the following error: Program received signal SIGSEGV: Segmentation fault - invalid memory reference. Backtrace for this error: #0 0x6f8b36e3 #1 0x6f8a2722 #2 0x402752 #3 0x747bd411 I have to solve the Kepler's equation: f=psi-e*sin(psi)-M for each value of M .So, if I have an array M of dimension 8, my program will calculate 8 zeros. The thing is that, if I write f=psi-e*sin(psi)-M(1) I will calculate the first zero,and if I write f=psi

问题 This question already has answers here : Closed 7 years ago . Possible Duplicate: iterating one key in a python multidimensional associative array i created a dictionary on 2 dimensions myaddresses['john','smith'] = "address 1" myaddresses['john','doe'] = "address 2" How can i iterate over one dimension in the fashion for key in myaddresses.keys('john'): 回答1: Bad news: you can't (not directly at least). What you did was not a "2 dimensions" dict, but a dict with tuples (string pairs in your

问题 I'm trying to make some geometric transformations (e.g. scale,shear) on an image already loaded in a bitmap object I then found a Built-in Matrix class in C# , I used it but I'm not sure on how to initialize a 2x2 matrix or a column vector etc. The 4th overloaded constructor forces me to enter 6 values representing 3x2 ,but that I don't want! I used this reference but couldn't find an answer https://msdn.microsoft.com/en-us/library/system.drawing.drawing2d.matrix(v=vs.110).aspx 回答1: As

问题 I read all posts in the net adressing the issue where people forgot to change the target vector to a matrix, and as a problem remains after this change, I decided to ask my question here. Workarounds are mentioned below, but new problems show and I am thankful for suggestions! Using a convolution network setup and binary crossentropy with sigmoid activation function, I get a dimension mismatch problem, but not during the training data, only during validation / test data evaluation. For some