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KDB projection with multiple variables


KDB projection with multiple variables

By : Danny Lange
Date : November 17 2020, 11:55 AM
help you fix your problem Here is my understanding of your doubt:
You have a list of inputs as L:(inputs1;inputs2;...) , where inputs1 is a list of (date;symbol;starttime;endtime) and you want to apply 'test' function on each input list in 'L'.
code :
    q) f:{[a;b;c]  a+b+c}
    q) f . (1 2 3)
    q) 6
    q) f ./: ((1 2 3);(4 5 6))
    q) 6  15
    q)test ./:L


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Dynamic mongo projection - a projection that uses a field in the document to determine the projection

Dynamic mongo projection - a projection that uses a field in the document to determine the projection


By : Cormac Cotter
Date : March 29 2020, 07:55 AM
help you fix your problem Unfortunately this is not available yet as part of the aggregation framework. However, according to this JIRA ticket, it is currently "planned by not scheduled". The only way of doing this currently is by using the map/reduce functionality. If you want to go ahead and use that, it would mean doing something as follows:
Map each document by _id and emit the appropriate key. Since there will be only one value per key, the reduce function will not get called, but you still need to initialise the variable you use for the reduce function. You can use an empty function or an empty string. Run map/reduce, saving the results in a collection of your choice.
code :
var mapper = function() {
    var typeValue = this.types[this.default];
    emit(this._id, typeValue);
};
var reducer = "";

db.types.mapReduce(mapper, reducer, { out : "results" } );
> db.results.find();
{ "_id" : ObjectId("53d21a270dcfb83c7dba8da9"), "value" : 1 }
var mapper = function() {
    var typeValue = this.types[this.default],
        typeKey = "types." + this.default;

    emit(this._id, { key : typeKey, val : typeValue } );
};   
> db.results.find().pretty();
{
    "_id" : ObjectId("53d21a270dcfb83c7dba8da9"),
    "value" : {
        "key" : "types.x",
        "val" : 1
    }
}
Migrating from basemap Near Sided Perspective (nsper) projection to using cartopy Geostationary projection

Migrating from basemap Near Sided Perspective (nsper) projection to using cartopy Geostationary projection


By : Pierre de la Lande
Date : March 29 2020, 07:55 AM
it fixes the issue This looks like a bug to me. @ResMar's assertion that the extents aren't in a projection is incorrect. According to the documentation for get_extent():
Why is the opengl projection of a model not giving the exact same results as the opencv projection?

Why is the opengl projection of a model not giving the exact same results as the opencv projection?


By : user2738569
Date : March 29 2020, 07:55 AM
hope this fix your issue The source image has a barrel lens distortion. This is a non-linear distortion of the image that cannot be described by a projection matrix. OpenGL, on the other hand, uses a rectilinear projection: one that projects straight lines onto straight lines. So it cannot account for the lens distortion in the source image.
To solve this properly you need to render the image using a rectilinear projection and then distort it using the lens distortion coefficients, which you should be able to retrieve from OpenCV intrinsic camera parameters. This would require rendering to a texture and then sampling from that texture at the correct coordinates. See Distortion on Wikipedia for details.
How to pass variables to Expression Func Projection before compile

How to pass variables to Expression Func Projection before compile


By : user2834711
Date : March 29 2020, 07:55 AM
I wish this helpful for you I don't use EF so this might vary in your specific use case, but this seems to be a question about LINQ Expressions more than anything else.
The first big problem is that you are trying to use an Expression> where you really meant Expression> and that's not going to do what you want. Instead of binding to a variable you're invoking the indexed variant of Select. So instead of getting the same value of i for all rows you get the index of the row.
code :
public static Expression<Func<ApplicationUser, SearchResultItemViewModel>> Projection(int parm)
    => item => new SearchResultItemViewModel
        {
            Id = item.Id,
            Article = item.FirstName + parm.ToString()
        };
Mapping coordinates from 3D perspective projection to 2D orthographic projection in OpenGL in C++

Mapping coordinates from 3D perspective projection to 2D orthographic projection in OpenGL in C++


By : Jesus
Date : March 29 2020, 07:55 AM
I wish this help you You may be interested in using something like gluProject to go from your object coordinates to the actual (projected) position on screen. Once you have the screen coordinates of the object, it's easy to draw a line from one point to another.
In this case, you'll want to project the centre point of the sphere. For more complex objects I've found that it makes sense to project all of the corners of the object's bounding box and then take the extents of the screenspace position of those corners.
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