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37m
comment Programmable current laser drive circuit
Opamps with the shutdown function normally make the output high impedance when it's enabled. This would work particularly well if M1 became a BJT. You'll probably still want a base resistor to help linearize the load characteristic and make it more controllable. Main problem with high current opamps is that they tend to be either slow or expensive, but you can get decently fast power transistors.
1h
comment Programmable current laser drive circuit
On/off switch may be better implemented using an opamp with a shutdown input and a pulldown for M1's gate. Laser diodes are very sensitive to current excursions and to switch it using M2 may result in instability or overshoot by OA1/M1 when turned on. You will probably need either a gate resistor or an isolating (bipolar) transistor, or both, to avoid problems of a capacitive load for OA1. In fact, replacing M1 with a BJT may make things easier on both counts.
4h
comment How I can get faster code for computing a fractional derivative?
FullSimplify is often quite slow (especially on large expressions), and most builtins do not return a simplified output. If this is the problem then you can improve the speed of your code by changing FullSimplify for either Simplify or Refine. Additionally, Integrate can be faster if assumptions are given within it rather than applied to the more general result.
6h
comment How do I use the third and fourth arguments of Parenthesize?
Strictly speaking these rules should be defined directly on MakeBoxes rather than as upvalues on Transpose, both since the system is designed to work that way, and because Transpose is protected.
7h
comment Rudimentary/basic simplifications of expressions not carried out--very puzzling!
The crosses ("\.10") seem to be an ASCII control code (data link escape). I am not sure if one ought to expect Mathematica to be able to take control codes as part of symbol names.
7h
comment Rudimentary/basic simplifications of expressions not carried out--very puzzling!
I updated your question so that it properly copies into Mathematica. However, you need to be more specific about what you mean by "leaving in expanded form". Please give an example of what you see versus what you want. And what are those weird cross-like characters? Are they supposed to be there?
7h
revised Rudimentary/basic simplifications of expressions not carried out--very puzzling!
deleted 4852 characters in body
7h
comment Can I hold a condition in NMaximize/NMinimize?
I am not at all sure that positive semidefiniteness is a valid constraint for NMinimize. Constraints, for it, are limited to things that can be enforced using KKT conditions.
1d
comment Mathematica showing wrong plot for function f(x) = 3/2 +( Sech[1/x]/x)^2?
It doesn't go to zero, it goes to 3/2. The vertical axis doesn't always start at 0 by default. If you want that then add AxesOrigin -> {0, 0}
1d
answered How can I get LogIntegral[z] to be printed as "li[z]"?
1d
comment Raspberry Pi Temperature and Performance
Since you have no particular requirements and so no standard to judge which suggestions are better or worse than any others, why not just do some FFTs or matrix multiplications, or solve some large linear systems? These are classical computationally intensive operations, albeit if you aren't going to use the result for anything, they're just as synthetic as anything else. But I don't know whether these use optimized machine libraries on the Raspberry Pi, which is another reason why I suggested to use the cpuburn code.
1d
comment Raspberry Pi Temperature and Performance
You probably got downvoted because of your imprecise specifications. Mathematica can be used to do any sort of computation you can imagine, and they all have different performance parameters. That's why I suggested you use a synthetic loop to examine the worst case, which is all that really matters, isn't it? Anyway, what sort of application do you have in mind, in order to be able to get some suggestions?
1d
comment Raspberry Pi Temperature and Performance
None. Use this (or something similar) instead.
2d
comment xDSL Modem Design
What actually is "such a module" or "relevant subsystems" in your conception? Can you give examples? This description is too vague to know what you are really asking about. Do you know what functions the VDSL modem accomplishes, for example? If so, perhaps you can start by asking how some specific functions are (or could be) implemented. If not, learn about them first, then ask. (A brief introduction here.‌​)
2d
awarded Revival
May
2
comment Particles bouncing in a 3D box
What's up with the single black particle in the first animation? It seems to be controlled by Maxwell's demon...
May
2
comment Particles bouncing in a 3D box
You should use Imgur and not Postimage if you want the animation to work. Postimage serves your animation as HTML (containing a number of "adult themed" adverts) rather than GIF. StackExchange has a contract with Imgur to host all the images on the site and there is a better chance that the posts won't be rendered useless by the images disappearing (or being supplanted by porn ads) if you use them. The image upload thing does suck, but that's life I'm afraid. By the way, thanks for supplying the alt text. So few people bother with it.
May
2
revised Particles bouncing in a 3D box
fixing image links
May
2
revised How to copy text from InputField without adding spurious spaces?
added 149 characters in body
May
2
answered How to copy text from InputField without adding spurious spaces?
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