When working with mathematical simulations or engineering problems, it is not unusual to handle curves that contains thousands of points. Usually, displaying all the points is not useful, a number of them will be rendered on the same pixel since the screen precision is finite. Hence, you use a lot of resource for nothing! This article presents a fast 2D-line approximation algorithm based on the Douglas-Peucker algorithm (see [1]), well-known in the cartography community. It computes a hull, scaled by a tolerance factor, around the curve by choosing a minimum of key points. This algorithm has several advantages: 这是一个基于Douglas-Peucker算法的二维估值算法。
标签： mathematical engineering simulations problems
上传时间： 2013-12-20
上传用户：changeboy
局部线性嵌入法，用于数据降维 .lle.m -- A simple matlab routine to perform LLE. .scurve.m -- Code to run the "s-curve" example. .swissroll.m -- Code to run the "swiss roll" example.
上传时间： 2016-07-28
上传用户：15071087253
im2dat.m is used to convert images to data which can be plotted using the standard MATLAB functions. This is very handy if you have plots on hardcopy and you want to convert them into data that MATLAB can use. The scanned image can be analysed by this function and the output will allow you to perform any calculation/manipulations that MATLAB can perform, e.g. curve fitting.
标签： functions standard convert plotted
上传时间： 2014-12-07
上传用户：gdgzhym
What I am trying to introduce here is a full fledged Java Instant messenger, which has all the features supplied by commercial messengers like Yahoo or MSN. Although it cannot compared to be in par with those messengers, it is an attempt by me to learn Advanced Java and JNI concepts. The challenges I faced here were often overcome by referring to numerous sites, which nearly zeroes in or completely solved the issues I faced at that point of time. It improved my learning curve and also believe would do the same to you too. Ofcourse, there are some bugs and glitches, which I hope you would excuse. Thanks to anyone who takes the pain to report them or even suggest better way of doing things to me.
标签： introduce messenger Instant fledged
上传时间： 2014-12-05
上传用户：电子世界
如果数据库系统（ database systems）像受人尊敬的智者讲述的条理清晰的故事，那么工作流（workflow）就像一群乳臭未干的小子在大谈各自的“哲理”。之所以这样讲，我是想指出，工作流系统 （workflow management systems）还处于技术发展曲线（ technology hype curve ）上的初级阶段。在这个领域我们将面临一个激动人心的阶段。为了描述这一点，可以和关系数据库系统（RDBMS）做一个对比。当在软件开发团队中谈论RDBMS时，大部分人会有一个清晰的概念，在你和他们交流的时候，人们会通过轻微的点头表示认可或理解你所说的。可当使用工作流术语讨论工作流时，他们会摇头表示不同意，因为每个人对工作流术语都有不同的理解。
上传时间： 2013-12-23
上传用户：498732662
Basic function to locate and measure the positive peaks in a noisy data sets. Detects peaks by looking for downward zero-crossings in the smoothed third derivative that exceed SlopeThreshold and peak amplitudes that exceed AmpThreshold. Determines, position, height, and approximate width of each peak by least-squares curve-fitting the log of top part of the peak with a parabola.
标签： peaks function positive Detects
上传时间： 2017-04-26
上传用户：彭玖华
