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问题 Is there a way with Javascript (or jQuery) to draw lines between coordinates (not necessarily showing those lines) and then repeat an image or a letter along those "paths"? I am talking straight lines here, no bezier curves or anything. I would think it doesn't seem like a big deal and will give it a go, but I'd like to have others' opinion on this... something like (imaginary code): path = point1[x,y], point2[x,y], point3[x,y]; every20pixels-->renderimage('path/to/image') or letter('letter')

问题 How would i read lines with format intA intB intC intD charP where "charA" is optional? Also there is possibility of a comment marked with # text I tried something like this FILE = 'test.txt' while IFS=' ' read -r numA numB numC numD charP #do something with this done < FILE but i don't know whether i'm on a right path and what to do with charP sample: # comment 12345678 24 15 3 p 87654321 11 4 8 43218765 27 10 2 P 回答1: You're on the right track, but there are problems with your code: Remove

问题 I want to match the lines of one text file with another text file, line by line, there is a problem with my nested for loops, it must be simple, but I can't find it, for line1 in ratings: cont1+=1 for line2 in movies: cont2+=1 print(cont1,cont2) I simplified it with this loops, to check the error, The outer loop doesn't reach cont=2, 1 1 1 2 1 3 1 4 1 5 1 6 1 7 . . . 1 157 >>> 回答1: you need to loop over both files simultaneously ratings= open('ratings.txt') movies= open('movies.txt') for

问题 Right now I am working on a project that requires me to detect when a perforated line is in the middle of the video image and then output a serial command to control a cutter arm. Right now I can detect lines that are vertical (which is what I want), However I can not detect just when they are in the center of the screen. Also I imagine that using the output from the following line I could tell that there are lines being detected?: lines = cv2.HoughLinesP(edges, 1, math.pi/1, 1, None, 23, 1)

问题 Is there a way to view jpg images within command line PHP? I would like to loop thru a directory of photos within a command line PHP program and use a keystroke, by utilizing php stdin, to take an action on that photo, like move it to another directory. I have not been able to locate a method to output each image from command line PHP. Thanks Here is the code I have thus far. If I can view the jpg I think I might be ok … <?php // View the jpg images one at a time $files = glob("images/*.jpg")

问题 I am fully aware that there were many approaches to this problem. What I need is a simple Python script that would replace only 1 line in a large text file. It is always the fourth line from the beginning. As the file (actually, files) is bigger than 20GB, I don't want to load it to memory or create a copy, just replace one line efficiently. I'll be glad for any help in this regard. A. PS. I know vi can do it, but I need it as a script, so that someone non-vi-compatible would be able to do it

问题 I have a tab-delimited text file with 8 columns: Erythropoietin Receptor Integrin Beta 4 11.7 9.7 164 195 19 3.2 Erythropoietin Receptor Receptor Tyrosine Phosphatase F 10.8 2.6 97 107 15 3.2 Erythropoietin Receptor Leukemia Inhibitory Factor Receptor 12.0 3.6 171 479 14 3.2 Erythropoietin Receptor Immunoglobulin 9 10.4 3.1 100 108 24 3.3 Erythropoietin Receptor Collagen Alpha 1 Xx 10.7 2.7 93 105 18 3.3 Tumor Necrosis Factor Receptor Tumor Necrosis Factor Receptor 5 11.4 3.2 114 114 25 1.7

问题 I have declared a functor and made a call so std::sort with that functor as a parameter. Code: struct { bool operator() (const CString& item1, const CString& item2){ return MyClass::Compare( Order(_T("DESC")), item1, item2); } }Comparer; std::sort(AllObjects.GetData(), AllObjects.GetData() + AllObjects.GetSize(), Comparer); Simple question: can I do this in one line? 回答1: If your compiler supports c++11, you can use a lambda std::sort(AllObjects.GetData(), AllObjects.GetData() + AllObjects

问题 In an application I am developing I have a number of lines represented by Latitude and Longitude values. I want to check if another line intersects any of these lines at any point. Say I have the line A-B I want to know if it intersects the line C-D at any point. The first and second examples above would lead to no intersection whereas the third example would. For my scenario the actual intersection point is not necassary for the application to function, so a simple yes/no to the intersection

问题 "How to find a third point given both (2 points on a line) and (distance from third point to first point)?" Language: Visual Basic (2012) The third point is on the same line as the second, and may be either closer to the first point or it may be closer to the second. This is a function that will handle both (from arrays of data). Strangely I cannot seem to grasp the distance part of this question. Over reading many other questions on finding points from other points, I am unable to find