transformation

问题 Given a list of objects, I am needing to transform it into a dataset where each item in the list is represented by a row and each property is a column in the row. This DataSet will then be passed to an Aspose.Cells function in order to create an Excel document as a report. Say I have the following: public class Record { public int ID { get; set; } public bool Status { get; set; } public string Message { get; set; } } Given a List records, how do I transform it into a DataSet as follows: ID

问题 I need to implement DCT transform, but i can't use float or double types. There is a lot of implementations on the internet, but all of them use float. Does anyone know any source with DCT on integers? P.S I need it to implement Color Layout Descriptor. 回答1: I found a blog post that describes the integer based DCT and IDCT here and gives an implementation in Matlab. The code he used is on GitHub, available here. I used the method bink_dct_B2.m. This calculates a scaled 1D-DCT transform, so if

问题 I'm trying to rotate a Bitmap where the pixels are stored in an Array int pixels[] . I got the following method: public void rotate(double angle) { double radians = Math.toRadians(angle); double cos, sin; cos = Math.cos(radians); sin = Math.sin(radians); int[] pixels2 = pixels; for (int x = 0; x < width; x++) for (int y = 0; y < height; y++) { int centerx = this.width / 2, centery = this.height / 2; int m = x - centerx; int n = y - centery; int j = (int) (m * cos + n * sin); int k = (int) (n

问题 Input XML: <?xml version="1.0" encoding="UTF-8" standalone="yes"?> <ns2:VendorMessageRequest xmlns:ns2="http://order.com.company.com"> <ns2:purchaseOrder> <assignedTo> <firstName>firstnm</firstName> <lastName>lstnm</lastName> </assignedTo> </ns2:purchaseOrder> </ns2:VendorMessageRequest> using XSLT as: <xsl:stylesheet version="2.0" xmlns:xsl="http://www.w3.org/1999/XSL/Transform" xmlns:ns2="http://www.company.com/services/entity/v1" xmlns:ns3="http://www.company.com/services/dataobject/v1"

问题 I found this CanvasRenderingContext2D and i played around a little bit with it. I was able to scale and to rotate my Image using this context: crop: function () { var canvas = document.createElement("canvas"); var context = canvas.getContext("2d"); canvas.width = this.options.width / this.scale; canvas.height = this.options.height / this.scale; var currWidth = this.imgWidth * this.scale; var currHeight = this.imgHeight * this.scale; var correctX = (currWidth - this.imgWidth) / 2; var correctY

问题 I ran into an R problem, which seems to be a little bit tricky. I have a data.frame that looks like this: Ident | A1 | ... | An | Z1 | ... | Zn 1 | 1 | ... | 1 | 1 | ... | 0 2 | 6 | ... | 4 | 0 | ... | 1 3 | 4 | ... | 4 | 1 | ... | 0 4 | 1 | ... | 4 | 0 | ... | 0 Now, what I want is to transform the original data.frame to the following structure: Z | A1 | ... | An Z1 | 1 | ... | 1 Zn | 6 | ... | 4 Z1 | 4 | ... | 4 Only rows are taken into the resulting data if any of the rows Z's is 1. Any

问题 I have the same rectangle in an untransformed form and in a perspective form. Both, the coordinates from the untransformed form as well as from the perspective form are in the untransformed coordinate system. Is there a way to reconstruct the transformation matrix which leads to this transformation? I think it should be possible to do that by solving the 4 equations given by the 4 corners but I am not sure where to start. // Edit: It looks like I am victim of a xy problem here. All answers

问题 Hello friends I am working on a project and I have a problem. See Images below This purple rectangle is my main region which I want to rotate and transform. I have rotated this using Qtransform rotate at 30 degrees and has size(180,173). I have calculated the cords of inner region and pass those to paint event and when I resize outer Rectangle this inner rectangle is drawn using painterpath see image below Now this purple region in img 2 looks like transformed because I have drawn only cords

问题 I have a well functioning NetLogo model of pedestrians in a generic, urban environment loaded from shapefiles - including projection/transformation (See selected code lines below). How do I export the xcor's and ycors of turtles to text files, projected/transformed into the original projection system? Thanks in advance code examples... gis:load-coordinate-system (word "../data/testLines_2.prj") set ODLines gis:load-dataset "../data/testLines_2.shp" setUpEnvelopeExtented ODLines 10 回答1: maybe

问题 Need help with building an XSL version 2.0 file in converting XML file to text output. Below is the XML file. For all the elements that have field as "Checked = 'Y'" we need a "[X]" concatenated before the text output. Tab spaces should be based on the level of ansestor-tags. <Review> <Assignment/> <Authorization/> <Criteria> <Components/> <OrganizationalPolicy/> <DecisionPoints/> <Notes/> <QualityIndicators/> <Responses> <Response CPID="AISD01590403010101" Checked="Y"/> <Response CPID=