# All Questions

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### New list generated from the sum of elements taken from two lists

I have been using mathematica for a while, but I have problem wrapping my head around list manipulation functions. I would appreciate any suggestions. Here is what I want to do. ListV is a list of ...
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I need to integrate the function, $f(a,b)=-g(a,b)ln(g(a,b)) = -1/ Pi(( (E^(-((a^2 - E^(-t [Gamma]) [Alpha]^2)/( 1 + 2 [Sigma]^2)))) [Pi] ([Sigma]^2) )/((1 + 2 [Sigma]^2) (E^(2 ... 0answers 511 views ### Estimate parameters of the state space model I'm using Mathematica 9 and its Control Systems functionality. I've searched the references extensively but seem not to be able to find any examples of state space model parameters estimation. All ... 3answers 3k views ### Install issue: Mathematica 9 on Ubuntu 13.10 I am trying to install Mathematica 9 on a Ubuntu 13.10 system. I had this working on my previous 13.04 version but now it breaks on when trying to unpack the sh archive: ... 0answers 151 views ### Calculating derivatives of roots of equation I am interested in calculating how the roots of an equation change as one of the variables does, when the equation is evaluated numerically rather than symbolically. I have edited this code to be ... 1answer 238 views ### {Latitude, Longitude} to Transverse Mercator projection I have a shapefile with the following "CoordinateSystemInformation": ... 1answer 109 views ### Why does$Failed have attribute HoldAll?

Why does $Failed have attribute HoldAll? Are there typical situations where$Failed is ...
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### Change ticks from number to hours

I have an unidimensional array (let's call it list)ranging from 0 to 86400, each one representing a second of a day (a day has 86400 secs). For example, ...
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### DynamicModule with intermediate expressions

I am trying to generalize a Manipulate construct into a DynamicModule one to try and include smoother controls, but I seem to be ...
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### Export an image at 1000 dpi

I'm trying to export an image at 1000 dpi. The author guide of a lot of papers wants this resolution! Then I must to import this image in Word in a small box; let's say 7x4 cm. This is the code that I ...
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### Can Mathematica Operators be combined in a linear fashion for readability?

Here's a simple example. Suppose we want to find the off-diagonal matrix of m: m={{1,2},{3,4}} This can be solved fairly simply by extracting a list of the ...
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### N[number, 100] does not give 100 decimal places [duplicate]

Please look at this computations: a = N[Sqrt[2], 20]; N[a^2, 100] The output is 2.0000000000000000000, which is apparently not $a^2$ to 100 decimal places. ...
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### Mathematica 9 Autocomplete Pop-up issue

I've just installed Mathematica 9.0.1 Student Edition on my Laptop and my Home PC. On my Laptop, it works just fine. But on my Home PC I get this weird issue of the pop-up command autocomplete window ...
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### Plotting the results of a system of equations

I believe this is a question of more list manipulation than plotting, but I hope you could help me. I solve numerically a system of equations of 3 variables, take only real solutions where one of the ...
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### Remote kernel shuts down after several seconds

I have Mathematica 9 installed on two Windows Server 2008 R2 machines. Now i want to try using one of them as a frontend with local kernels and the other one for remote kernels. OpenSSH 6.5 for ...
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### PlotRangePadding that's a fixed fraction of a plot's longest dimension

I am trying to produce plots of a region which can alternately become very long or very tall, and I would like to have some padding around it which is uniformly thick in both the horizontal and ...
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### Morphing a “sheet of paper” into a torus

How can I visualise the standard topological "rubber-sheet" construction of a torus, that is, morphing a square into a torus? How can I start or are there any examples in the Mathematica ...
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### How to customize derivative behavior via upvalues?

I'm having trouble getting customized derivatives (defined using upvalues) to behave in sane ways. By this I mean that I'd like to define a derivative using an upvalue and then have Mathematica apply ...