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Computing Histogram of Oriented Gradients

The third parameter channels in the call to cv::calcHist(...) should not be 0 (which makes it a null pointer). OpenCV expects here a pointer to an array of indices depicting the channels of interest.

Since you want to use the first channels (index 0), your code should look like this:

int channels[] = { 0 };
calcHist(&cell_fourPx, 1, channels, ...);

Categories : C++

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Juce c++ using gradients
you can use Path class and use void fillPath (const Path &path, const AffineTransform &transform= AffineTransform::identity) or any other similar method. you have a lead now you can research on this.

Categories : C++
Object Oriented Modelling Advice
My thoughts are that Products should be a module(?), as other classes 'have products', as opposed to 'are products’? I'd prefer to make Product an AR::Model. In fact it is a separate entity with its own behavior and state. It is a core model of your app, if I understood everything right. I’m unsure that I even need a Product library (would it just be products.all?)? If you will

Categories : Ruby On Rails
Object-Oriented Programming and databases
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Java object oriented - data structures
Pretty much any built in class that implements the List interface (e.g. LinkedList or ArrayList can be used to store as much data as the JVM will allow your program to use. To store these after the program closes, you'll need a way to store the data in either a file or a database of some sort, which you can load into a List as needed. As the List interface includes the contains(Object o) method, a

Categories : Java
Computing an ODE in Matlab
Please note that matrix exponential is defined for square matrices. Your attempt to multiply the attenuation coefs with the time vector doesn't give you what you'd want (which should be a 3D matrix that should be exponentiated slice by slice). One of the simple ways would be this: A = [-2.1, 1.6; -3.1, 2.6]; t = 0:5; n = numel(t); %'number of samples' y = NaN(2, n); y(:,1) = [1;2]; for k =2

Categories : Matlab
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