algorithmic modeling for Rhino

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Topic: Error in the Honeybee_ Run Energy Simulation: nd this is the error text: 0. Current document units is in Meters1. Conversion to Meters will be applied = 1.0002. [1 of 8] Writing simulation parameters...3. [2 of 8] No context surfaces...4. [3 of 8] Writing geometry...5. [4 of 8] Writing Electric Load Center - Generator specifications ...6. [5 of 8] Writing materials and constructions...7. [6 of 8] Writing schedules...8. [7 of 8] Writing loads and ideal air system...9. [8 of 8] Writing outputs...10. ...... idf file is successfully written to : C:\Users\Pier\Desktop\Dottorato\Energy_plus_file\cell room\EnergyPlus\cell room.idf11. 12. Analysis is running!...13. C:\Users\Pier\Desktop\Dottorato\Energy_plus_file\cell room\EnergyPlus\eplusout.csv14. ...... Done! Read below for errors and warnings: 15. Thanks in advance to all for your help me Francesco…; Added by Pierfrancesco Prosperini to Ladybug Tools at 11:36am on January 10, 2016

Comment on: Topic 'GH at the Workplace...Welcome Your Input': 可能就是这样的了。如果GH依然是一个类似的工程工具，在工具的把手上连接了数学、优化、思维、、、可以直接数控，衍生更多插件。犹豫的方面在站立的角度，逻辑！中世纪？延续，时间、地域，那个猴子理论上无限地打字，可以打出完整的《哈姆雷特》拉丁版，出版之前和使用GH制定方案之间，可能会有一些光速、时间、方式——1、2、3、4，A、B、C、D。不同的树枝伦理。; Added by zlyx at 6:21am on September 3, 2012

Topic: What are random seed values?: t, let's talk about randomness. Randomness is a problem in computing because digital computers are deterministic. If you give them the exact same instructions they always end up with the exact same result. It turns out to be mathematically impossible to generate true random numbers using a digital computer, but it is fairly easy to generate pseudo-random numbers. This is actually not bad news as pseudo-random numbers -unlike real random numbers- can be generated again and again and you'll end up with the same random numbers every time. Being able to get the same random numbers on demand increases the reliability of these number sequences which in turn makes them easier to use. Pseudo-random numbers are numbers that have certain characteristics. Note that when we talk about random numbers we are really talking about numbers. Plural. It's easy to generate only a single one, as xkcd so eloquently put it: So what are these characteristics that define pseudo-randomness? Without being actually correct, I can sum them up as follows: The sequence of generated numbers should never repeat itself* The numbers in the sequence ought to be spread evenly across the numeric domain** There are a lot of different algorithms out there, some better than others, some faster than others, some solving very specific problems while others are more generic. The generator used in Grasshopper is the standard Microsoft .NET Random, based on Donald Knuth's subtractive algorithm. So let's imagine we want random integers between 0 and 10. What would a bad random sequence look like? 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 (about as bad as it gets) 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 (not random at all) 1 3 2 5 3 9 1 2 4 2 5 1 1 2 8 1 5 2 3 4 (too many low numbers) 2 8 4 6 0 9 8 2 4 8 6 4 2 2 5 1 4 8 6 2 (too many even numbers) So what about good sequences? Well, here's a few: 6 9 1 2 0 4 2 8 5 7 2 9 1 9 2 5 3 1 9 2 (sure, why not) 6 2 5 3 4 1 9 7 8 0 2 1 6 4 5 8 9 5 0 9 (looks about right) 1 8 5 2 3 4 5 7 9 5 2 1 0 2 1 0 9 7 6 4 (I suppose) 9 0 6 4 8 3 1 5 2 7 6 1 4 6 0 1 9 7 5 6 (whatever) There are a lot of valid pseudo-random sequences. (Seriously, loads). So even if we have a good pseudo-random generator we may be given a random sequence that isn't entirely to our liking. The shorter the sequence we need, the more likely it is that statistical aberrations invalidate that particular sequence for us. What we need is some control over the generator so we don't just get a repeatable sequence, but a repeatable sequence we actually like. Enter seed values. The random generator requires a seed value before it can generate a random sequence. These seed values are always integers, and they can be any valid 32-bit integer. Every unique seed value results in the same sequence. Every time. Unfortunately there is no clear relationship between seeds and sequences. Changing the seed value from 5 to 6 will result in a completely difference random sequence, and two sequences that are very similar may well have to wildly different seeds. There is therefore no way to guess a good seed value, it is completely trial-and-error. Also because of this extremely discontinuous nature, you cannot use tools like Galapagos to optimize a seed value. If you are looking for a pseudo-random sequence which has custom characteristics, you may well end up having to write your own generator algorithm. Ask questions about this on the Grasshopper main forum or the VB/C# forum. Conclusion: Seed values are integers that define the exact sequence of pseudo-random numbers, but there's no way of knowing ahead of time what sequence it will be and there's no way of tweaking a sequence by slightly changing the seed. Even the tiniest change in seed value will result in a radically different random sequence. -- David Rutten david@mcneel.com Poprad, Slovakia * This is not actually possible. A finite amount of numbers always repeats itself eventually. ** This should only be true for long enough sequences, short sequences are allowed to cluster their values somewhat. Interesting links for further reading: Coding Horror: Computers are Louse Random Number Generators StackOverflow: When do random numbers start repeating?…; Added by David Rutten at 9:52am on October 20, 2012

Comment on: Topic 'Help Please! Sorting Lists into subsets for manipulation': Looks good, How can I then select those circles as a branch? For example, I want to divide all the Radius 3 circles into 8 parts, all radius 9 into 6 parts etc. Many Thanks for your help; Added by Mark Eden at 1:59pm on March 22, 2016

Comment on: Topic 'Create Mesh from topology': d(2.0, 0.0, 1.0); //2 mesh.Vertices.Add(3.0, 0.0, 0.0); //3 mesh.Vertices.Add(0.0, 1.0, 1.0); //4 mesh.Vertices.Add(1.0, 1.0, 2.0); //5 mesh.Vertices.Add(2.0, 1.0, 1.0); //6 mesh.Vertices.Add(3.0, 1.0, 0.0); //7 mesh.Vertices.Add(0.0, 2.0, 1.0); //8 mesh.Vertices.Add(1.0, 2.0, 1.0); //9 mesh.Vertices.Add(2.0, 2.0, 1.0); //10 mesh.Vertices.Add(3.0, 2.0, 1.0); //11 mesh.Faces.AddFace(0, 1, 5, 4); mesh.Faces.AddFace(1, 2, 6, 5); mesh.Faces.AddFace(2, 3, 7, 6); mesh.Faces.AddFace(4, 5, 9, 8); mesh.Faces.AddFace(5, 6, 10, 9); mesh.Faces.AddFace(6, 7, 11, 10); mesh.Normals.ComputeNormals(); http://www.rhino3d.com/5/rhinocommon/…; Added by Joost Lauppe at 2:09pm on October 4, 2011

Comment on: Topic 'Reordering branches by sorting the length of points connection': ;4}that like original tree structure?? …; Added by Tommy Su at 8:01am on May 3, 2017

Blog Post: Isolux curves for sky

Hallo Community,

Is there a plugin or a simple formula where i can insert the weather data (Global Illuminances) into a matrix and produce an isolux curve for sky?

The datas…

Added by nass at 1:36am on May 14, 2017

Comment for: Bill Chow: 其实也没用在什么固定的地方，只是作为一个工具用在适合的地方。之前用来做参数化的幕墙设计，现在在做建筑能耗模拟方面的工作，就在开发一个grasshopper插件来帮助完成大量的计算工作，暂时没和几何扯上关系，只是通过grasshopper运行外部程序而已，可能稍后会结合起来，方式最后可能和geco有点类似。主要是用惯了grasshopper，一直还在边做边学的阶段。; Added by Yi Lü 吕谊 at 6:25am on September 20, 2014

Comment on: Topic 'DataTree selection rules': [1,4,...,10] = 1 to 10 by 3 = 1 4 7 10 [1,6,...,10] = 1 to 10 by 5 = 1 6 [1,2,...,10] = 1 to 10 by 1 = 1 to 10 = 1 2 3 4 5 6 7 8 9 10; Added by Danny Boyes at 3:37pm on November 11, 2013

Comment on: Video 'Custom unroller': 搜索引擎站点的日常运营也一般不会受到任何的影响（软件工程）。它要具有不错的延展性——即使访问量爆增十倍，也不需要损耗 1一百倍的计算资源（算法）。搜索内容的有关性往往跟网站之间的关系有关联——你得要一份可以显示哪一些网站跳转到哪一些别的网站的表单。…; Added by Diego Martínez at 11:30am on January 28, 2022