R (D)COM how to import c# arrays into R to apply some R algorithms on it

R (D)COM how to import c# arrays into R to apply some R algorithms on it

By : user2948529
Date : November 14 2020, 04:51 PM
Hope this helps I cannot answer regarding R(D)COM, but there is no issue whatsoever with R.NET to do what you describe, so far as I can see. See https://github.com/jmp75/rdotnet-onboarding including a newly added SupportSamples project, reproduced below for information. It ran just fine, on a Linux box at least.
I suspect you call engine.Dispose() several times. Don't call it until you are really done with all calculations. An R limitation, not an R.NET bug. If you still have an issue, log it as such with reproducible code.
code :
static void stackoverflow_27689786_2752565 ()
    REngine engine = REngine.GetInstance();

    var rand = new System.Random (0);
    double[] randValues;

    for (int i = 0; i < 10; i++) {
        randValues = mkValues (rand, 100);
        Console.WriteLine ("std dev iteration {0} = {1}", i + 1, calcSDev (engine, randValues));
    // you should always dispose of the REngine properly.
    // After disposing of the engine, you cannot reinitialize nor reuse it

static double[] mkValues (Random rand, int n)
    double[] res = new double[n];
    for (int i = 0; i < n; i++) {
        var v = rand.NextDouble ();
        res [i] = (v < 0 ? -1 : 1) * v * v;
    return res;

static double calcSDev (REngine engine, double[] arr)
    // Note: only one quick and slightly dirty way to do it
    NumericVector rVector = engine.CreateNumericVector(arr);
    engine.SetSymbol ("x", rVector);
    return engine.Evaluate ("sd(x)").AsNumeric () [0];

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Apply algorithms considering a specific edge subset

Apply algorithms considering a specific edge subset

By : user1937549
Date : March 29 2020, 07:55 AM
Hope this helps Finally I think the boost::graph way to do this is to use boost:filtered_graph and demo for usage
"The filtered_graph class template is an adaptor that creates a filtered view of a graph. The predicate function objects determine which edges and vertices of the original graph will show up in the filtered graph."
Which sort algorithms does PHP's usort apply?

Which sort algorithms does PHP's usort apply?

By : James Jin
Date : March 29 2020, 07:55 AM
should help you out I want to sort files by modification time ascending and descending. , At php.net/sort I found this:
Examples of mathematics algorithms that apply to game development

Examples of mathematics algorithms that apply to game development

By : jrdn
Date : March 29 2020, 07:55 AM
wish helps you Not knowing Final fantasy at all, here are some thoughts.
Attack/Defence could either be a 'chance to hit/block' or 'damage done/mitigated' (or, possibly, a blend of both). If you decide to go for 'damage done/mitigated', you'll probably want to do one of: Generate a random number in a suitable range, added/subtracted from the base attack/defence value. Generate a number in the range 0-1, multiplied by the attack/defence Generate a number (with a Gaussian or Poisson distribution and a suitable standard deviation) in the range 0-2 (or so, to account for the occasional crit), multiplied by the attack/defence
machine learning algorithms that can not apply map reduce model

machine learning algorithms that can not apply map reduce model

By : simpresands
Date : March 29 2020, 07:55 AM
it should still fix some issue The MapReduce does not work when there are computational dependencies in the data. This limitation makes it difficult to represent algorithms that operate on structured models.
C++ apply standard library algorithms to functions

C++ apply standard library algorithms to functions

By : Jayson Brooks
Date : March 29 2020, 07:55 AM
hope this fix your issue Hypothetically, you could use something like boost::iterator::counting_iterator. E.g., the following finds that 4 is the number whose square is 16:
code :
#include <algorithm>                                                                                                                                                                                         
#include <iostream>

#include <boost/iterator/counting_iterator.hpp>

using namespace std;

int main(int, char**)

    auto f = std::find_if(
        [](int i){return i * i == 16;});
    cout << std::distance(
        f) << endl;

    return 0;
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