# All Questions

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### Issue with recurrence variables .. and manipulate

Hello i have problem with this code: ...
42 views

### Problem with CurrentValue[“MouseOver”] when graphics are wrapped with Deploy

Please take a look at following toy example: ...
15 views

### solving a trigonometric differential equation

hello could anybody please show me how to solve y''+ 2*y'+2y = 10 cos(t) I found the Yc , but I have problems figuring out the particular solution . Thank you for your help
324 views

### Combining the second elements of a set of ordered pairs based on their first element

I have a large set of ordered pairs and I am trying to add the second elements together for any group of pairs that has the same first element. For example my data looks like: ...
78 views

### How to find an approximate solution in a region when Solve or NSolve does not work?

Consider the relation x/Tan[Pi x] == y/Tan[Pi y] Solve or NSolve can't give a solution ...
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### Accumulate 2D points that have the same first component [duplicate]

I have a list of points: points={{3, 0}, {3, 9}, {4, 2}, {5, 5}, {6, 9}, {6, 6}, {6, 1}, {7, 7}, {8,0}, {8, 10}}; And as you can see on the plot, there are ...
37 views

### Solve non linear system of equations

I am trying to solve a system of two equations with two unknowns. In these equations I have, a part from constants: Unknown nr 1, $$D_{\perp}$$ Unknown nr 2, $$\omega_C$$ Known function of r: ...
218 views

### How to generate the following partitions

I have 2N items and I need to form 2N sets each with N items. The items should be evenly ...
83 views

### Mathematica Workbench - when to expect an update? [on hold]

I'm considering getting Mathematica Workbench 2. Looking at the videos on Workbench 2 and on "Profiling Mathematica code" @ 01:09 I see the current version nr 2 dates back to at least oktober 3 2007 ...
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### Summing Over a Variable Number of Indices

I am trying to figure out the best way to include a variable number of indexes of summation in a program. For example: Suppose I want to define a function $g[n,s]$ that returns the sum ...
37 views

### NLP Project in Mathematica [on hold]

For my CS class, I am required to create a final project written in Mathematica. My favorite field of CS is NLP (natural language processing), so I'm looking for ideas related to NLP for my project. I ...
207 views

### Most influential and/or disrupting features introduced with new versions of Mathematica

This is something that has been bugging me for ages. With every upgrade, Mathematica has added new functionalities and amendend some of its bugs. In the process, though, some older functionality has ...
123 views

### Is DateString supposed to be truncating seconds?

If I configure DateString to format dates as ISO dates with ...
39 views

### Numerical method for solving a polynomial equation

I am looking for a numerical solution of a equation which contains, in general, one polynomial equation with unknown variable x. I have tried Reduce, ...
68 views

### Collecting terms in an expression

I have an expression: ...
135 views

### Use of Manipulate in CDF documents

I am trying to publish a cdf document, but I'm having some problems with the function Manipulate with this code: ...
22 views

### Parallel kernels won't start [on hold]

On my new MacPro (on Mavericks) Parallel kernels will only start if the Master kernel is the standard one with name Local. My other added Master kernels will work but any Parallel Kernel evaluation ...
37 views

### Plot rate of change in $x$ axis of list of points

I have a list of points, that may have clusters in some of the $x$ axis values, and my goal is to get a function that shows that graphically. Something like this, but the red function is "hand ...
84 views

### Histogram with variable bin widths for (estimating distribution functions)

I've got a small set of data of size vs probability within an interval. The intervals (which I would want bin width to correspond too) are variable in width, e.g.' bin widths are ...
201 views

### Fast way to get positions of “boxed” array elements?

Given a 2D array (arbitrary numeric / evaluates to numeric elements, simplified for examples, and can be arbitrary dimensions so long as the operation makes sense, I'm working with 2K X 2K in my ...
59 views

### Scoping issue: replacing local variable lexically outside of its scope

Consider the following code ...
59 views

### How to get a number from Solve [duplicate]

It's often useful to get just one number from Solve. I use the following construction for acquiring one solution from the expression returned by ...
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### Render dynamic Graphics objects static

As was discussed in the comments of another question (MathLink Graphical Output (Plots) to File), Graphcis objects produced by commands such as ...
171 views

### Result about Context is inconsistent with the description of “Power Programming with Mathematica”

x = 5; tempx = 6; Begin["temp"] {x, Globalx, tempx} The result in my Mathematica session is {5,5,6}, but it's ...
55 views

### Sporadic bugs (?) in multidimensional SparseArray objects

What appear to be sporadic bugs (?) in multidimensional SparseArray objects (?) are plaguing our code development efforts. ...
98 views

### Saving a graph of a great number of nodes

I'm developing a code where I get graphs with over 10K nodes. These graphs have a particular relationship between clustering and degree that I need to save for future analysis. The problem is when I ...
71 views

### How do we make a negative integer out of a string of a negative number and vice-versa?

Negative numbers are not taken into consideration by mathematica's built-in functions. FromDigits["-2"] Gives me this message: ...
124 views

### Euler's method for system of differential equation

I need to program Euler's method to solve a system of two diffferential equations of first order. Fist, I have programmed the Euler's method for just one differential equation: ...
576 views

### Signal processing by means of WaveletTransform

I updated my question to explain what I want. I have the voltage-time curve from the real industial object. This curve was gotten from the digital oscilloscope: As you can see it has ...