Fazlollah Soleymani

172 reputation

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visits	member for	11 months
	seen	May 15 at 6:32
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	172 reputation	bio	website		visits	member for	11 months
6 badges		location			seen	May 15 at 6:32

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Feb 24	comment	How to accelerate updating some parts of sparse matrices? In my idea, the best way is to extract the diagonal elements of the matrix inverse, and then update your matrix $mat$. In such a way, the norm of the matrix $Id-A.mat$ will decrease much more and with one replacement you might obtain the best possible approximate inverse. The only problem is that how to extract or find the diagonal entries of the matrix inverse very fast for a very large sparse matrix!
Feb 24	comment	How to accelerate updating some parts of sparse matrices? I think the above piece of codes fail even when we test a 300*300 sparse matrix. I mean sometimes in my MMA 8, it gives the results and sometimes when I increase $num$ to 3 (for instance), it fails and the MMA generates a beep!
Feb 21	revised	How Simplify and Assume can be combined on matrix products? added 3 characters in body
Feb 21	asked	How Simplify and Assume can be combined on matrix products?
Jan 3	awarded	Supporter
Nov 23	comment	How to draw Fractal images of iteration functions on the Riemann sphere? Thanks, the problem is that when we reduce `PlotPoints` or `ImageResolution`, the quality gets down dramatically. I am looking for a fast way to obtain high quality pics, with small space size, just like the one given in the question. Rasterize@... is a good choice, but it disables the feature of rotating the 3D pic, and also gets the quality lower.
Nov 22	comment	How to draw Fractal images of iteration functions on the Riemann sphere? Thanks for your response. There are two problems. 1. How can one zoom in on a particluar place on this sphere without lowering the quality to observe the fractal behaviour of the method? 2. The "spcae size" of the output image? In fact, how one can save as the output fractal image with low "disk size" without lowering the quality in EPS format? For example, for $n=8$, its size is more than 2MB!
Nov 22	comment	How to draw Fractal images of iteration functions on the Riemann sphere? Thanks for your reply, but there are big white circles at the middle of each basin. They should not be here. Please rotate your image, and then you will see the incomplete fractal image. Can you solve this drawback?
Nov 22	awarded	Teacher
Nov 22	asked	How to draw Fractal images of iteration functions on the Riemann sphere?
Nov 22	answered	Is there any way to obtain an approximate inverse for very large sparse matrices?
Sep 12	revised	How to discretize a nonlinear PDE fast? deleted 1 characters in body
Sep 12	comment	How to discretize a nonlinear PDE fast? You solved Subscript[u, t] + u Subscript[u, xx] = c Subscript[u, xx]. Please consider solving the following NPDE instead: Subscript[u, t] + u Subscript[u, x] = c Subscript[u, xx].
Sep 11	comment	How to discretize a nonlinear PDE fast? In fact, it should be the nonlinear burgers equations.
Sep 11	comment	How to discretize a nonlinear PDE fast? I revised the question, now please give some comments.
Sep 11	revised	How to discretize a nonlinear PDE fast? added 24 characters in body
Sep 11	revised	How to discretize a nonlinear PDE fast? deleted 40 characters in body
Sep 11	revised	How to discretize a nonlinear PDE fast? deleted 40 characters in body
Sep 11	asked	How to discretize a nonlinear PDE fast?
Jun 15	awarded	Editor