transformation | 易学教程

R: Insert multiple rows (variable number) in data frame

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问题 I have a data frame with, say, 5 rows, for 2 observables. I need to insert "dummy" or "zero" rows in the data frame so that number of rows per observable is the same (and can be bigger than N rows for longer one). E.g.: # This is what I have: x = c("a","a","b","b","b") y = c(2,4,5,2,6) dft = data.frame(x,y) print(dft) x y 1 a 2 2 a 4 3 b 5 4 b 2 5 b 6 Here's what I'd like to get, i.e. add N rows per observable to 4. Mock up df x1 = c("a","a","a","a","b","b","b","b") y1 = c(2,4,0,0,5,2,6,0)

Spark中执行transformation和action的区别

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1，transformation是得到一个新的RDD，方式很多，比如从数据源生成一个新的RDD，从RDD生成一个新的RDD 2，action是得到一个值，或者一个结果（直接将RDDcache到内存中）所有的transformation都是采用的懒策略，就是如果只是将transformation提交是不会执行计算的，计算只有在action被提交的时候才被触发。从运行层面来看，Transformation实际上是一种链式的逻辑Action，记录了RDD演变的过程。Action则是实质触发Transformation开始计算的动作，由于在每个Transformation的过程中都有记录，所以每个RDD是知道上一个RDD是怎样转变为当前状态的，所以如果出错就可以很容易的重新演绎计算过程。 Reference： 1. http://blog.csdn.net/map_lixiupeng/article/details/41958561 2. http://www.dataguru.cn/thread-588091-1-1.html 3. http://my.oschina.net/hanzhankang/blog/200275 来源： oschina 链接： https://my.oschina.net/u/2243330/blog/633058

Matlab calculate 3D similarity transformation. fitgeotrans for 3D

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How can I calculate in MatLab similarity transformation between 4 points in 3D? I can calculate transform matrix from T*X = Xp , but it will give me affine matrix due to small errors in points coordinates. How can I fit that matrix to similarity one? I need something like fitgeotrans , but in 3D Thanks The answer by @rayryeng is correct, given that you have a set of up to 3 points in a 3-dimensional space. If you need to transform m points in n-dimensional space ( m>n ), then you first need to add m-n coordinates to these m points such that they exist in m-dimensional space (i.e. the a matrix

convert xml to soap request using xslt transformation in mule

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问题 How to convert xml to soap message using XSLT in mule? I am using mule community addition so I can't use mule datamapper. Can any one help me how to convert xml to soap message using XSLT tranformation? I have below xml: <file> <header> <documentType>CEN_ORD</documentType> <version>1.0</version> <createDate>01/01/15 02:11</createDate> <originator>IKEA</originator> <timeZone>PST</timeZone> <dateFormat>MM/dd/yy HH:mm</dateFormat> <currencyFormat>USD</currencyFormat> <weightUnits>lbs<

WPF client to screen point transformation

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问题 I'm looking for a way to transofrm given points that are relative to a Visual to Points on the screen. I found this solution: http://social.msdn.microsoft.com/Forums/vstudio/en-US/b327c0bc-d27e-44fe-b833-c7db3400d632/how-to-get-control-location-in-screen-coordinate-system I can't understand the different beween the pointRoot and the pointClient as they seem to be equal all the time: // [...] // Translate the point from the visual to the root. GeneralTransform transformToRoot = relativeTo

Show password characters for a short while before hiding them

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In my application I've implemented a num-pad of my own, which is used for entering (number-based) passcodes. The 'password', or rather the 'dot'-representation of it, is shown on 4 EditTexts implemented in 4 boxes above the num-pad. When you enter a number one of those boxes will get filled in with a dot - for this I use the TransformationMethod PasswordTransformationMethod - but I'd want the number you punch in to be visible for a short while before it gets hidden (Like ~200ms). Is there any implementation of this readily-done in Android or how would you implement this the best way? I'm sure

2D numpy array- check to see if all adjacent terms are equal

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问题 I am starting with a nxm boolean array, that defines regions- true if it is in the region, false if not. For example: r = np.array([[ 0, 0, 1, 1, 1], [ 0, 1, 1, 0, 0], [ 0, 1, 1, 1, 0], [ 1, 1, 1, 0, 0], [ 1, 1, 0, 0, 0]]) The line between regions can be defined as an n-1 x m-1 array, which would represent a 'point' in between each set of four values. If all 4 surrounding values are the same, you are not on the edge between regions. If any of the 4 values are different, you are. For r above:

Get the current matrix transformation of an SVG element

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I know a very easy way to get the current matrix transformation of any SVG element: // 't' is a string var t = window.getComputedStyle(nativeElement, null).transform console.log(t); The problem is that the previous method returns numbers with no more than six decimals. For example, the previous code may return: matrix(0.965926, 0.258819, -0.258819, 0.965926, 0, 0) Is there a way to get the matrix transformation of any SVG element more accurately? To get the current transform attribute as an SVGMatrix object, you can use: element.transform.baseVal.consolidate().matrix var myrect = document

Parametrized transformation from Pentaho DI server console

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I can execute a independent scheduled transformation from pentaho DI server console . But, issue on running a parametrized scheduled transformation from pentaho DI server console .How can i pass parameter value at run time . In pentaho BI server , to execute parametrized report we used to pass variable value in URL . tried same in pentho DI server as below but didnt worked http:// * * /pentaho-di/kettle/transStatus?name=UI_parameter&Values=Testvalue 来源： https://stackoverflow.com/questions/21878574/parametrized-transformation-from-pentaho-di-server-console

How GOTO statement in Groovy?

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问题 I saw this nice blog post about a Scala continuations that 'emulates' a GOTO statement in the Scala language. (read more about Continuations here) I would like to have the same in the programming language Groovy. I think it's possible within a Groovy compiler phase transformation. I'm working on an Domain-Specific Language (DSL), and preferred embedded in Groovy. I would like to have the GOTO statement, because the DSL is an unstructured language (and is generated from workflow diagrams). I