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20140924 21:01:20 +0100  answered a question  Insufficient RAM for computing newforms In Sage 6.1 on MacOS X in a Fedora 20 VM on VirtualBox. Model: iMac Processor: Intel Core i7 (QuadCore) RAM: 16 GB. The VM needs a lot of CPUTime and the use of RAM increases constantly. Start: 1.9 GB RAM After: 30 Min. 2.3 GB RAM After: 60 Min. 2.6 GB RAM I cancelled the calculation after 60 Minutes. 
20140919 16:04:56 +0100  answered a question  Good computer for fast computation I answer the question, about your $1500 three years later, but I think you have all ready bought your fast computer. In 2014 a fast computer should have a SSD Hard Disk >= 120 GB or more, 816 GB RAM DDR31600 or better an i5 or i7 for the consumer section makes not a great difference which CPU you have. The graphics card is not important if you only want to draw some of your plots the build in graphics card of the i5 or some models of i7 is enough, but an Nvidia or AMD Graphics card is also a good option. About GPU's power, yes it is true in some cases the GPU can speed up computation extremely, but this works not in all cases. Today (year 2014), their are only a few programs that uses the GPU power for calculation, because it is difficult to write software for combined GPU <> CPU power usage. It is important to say, today you could use Sagemath Cloud for your computation. On Sage math cloud you could use a lot of power if you want Sage math cloud limits As Kelvin Li says, if you really want to compute fast use Linux, because Sage works really fine with Linux. Linux Distributions that I know which has a nice Latex and Sage support are:

20140919 13:21:51 +0100  commented question  How to graph this function in Sage plot? Can you make the function more readable please, I think you mean this c*log(x)  x*d = a * log(y) + b*y + y0 
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20140918 15:02:04 +0100  answered a question  Custom color map for matrix plot? @kcrisman is absolutly right: here are some code examples based on that articel Custom Colormaps With a lookup dict: From pool: As gradient: 
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20140918 14:49:34 +0100  asked a question  How to make a custom divergent colormap? How can I make a custom diverging colormap in Sage?
What I want is the same than the reverse In the sage source code I found the following link Diverging Colormaps, which explains the divergent colormaps and has a python class in the attachments. But still I have no clue to make such a diverging colormap. I have also tried to make it with a LinearSegementedColormap: but the result is absolutely not what I want, because it goes too fast from red into pink. 
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20140912 14:43:36 +0100  commented answer  How can I plot matrices from Database into different sage cells? The looping is exactly what I want, but is there no possibility to make a new cell directly in the sage notebook? 
20140912 14:41:26 +0100  commented answer  How can I get the cell id of the current cell in a worksheet? the problem was I could not convert kcrisman's answer to an answer. 
20140912 14:40:31 +0100  answered a question  How can I get the cell id of the current cell in a worksheet?

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20140908 19:18:30 +0100  asked a question  How can I get the cell id of the current cell in a worksheet? How can I get the cell id of the current cell I work with?
I think of something like:

20140908 19:12:30 +0100  commented answer  Custom color map for matrix plot? I try this thanks 
20140908 19:10:24 +0100  asked a question  How can I plot matrices from Database into different sage cells? How can I plot multiple matrices from a sqlite Database into different sage cells? My first intention was iterate over the SQL result set with python in sage and plot every result into a different sage cell. But I do not know how I could plot them into different sage cells? Why I would do that? Thats simple I have between two and over 20 Matrices and every matrix has the dimension of 91x365! 
20140908 17:27:10 +0100  asked a question  Custom color map for matrix plot? I need colormap which has for a fixed value x the color white and all values above x are colorized from white do blue and all values below x are colorized from white to red. The first question is, is this possible? And my second question how can I do that? 