# All Questions

486 views

### How to calculate an integral of an expression that is determined numerically (in Mathematica)?

First of all, I am fairly new to Mathematica and Stackoverflow, so please feel free to give me any advice whatsoever. I aim to calculate an integral of an expression that has been determined ...
516 views

### Are plotting markers with inscribed letters possible?

I have large data consisting of values obtained by sweeping across three parameters (e, w, and f). I want to plot all this data on one graph using different shapes for e (e.g., circle, triangle, ...
717 views

### How do I make Reduce yield all solutions explicitly?

Say I want to do the following: Reduce[ x+y+z==1, {x,y,z}, Modulus -> 7 ] then I get a solution with parameters, C[1] : ...
1k views

### Why doesn't my Manipulate work?

I am new to Mathematica and reading my way through a few books. Playing around with Manipulate and I noticed the following does not work: ...
229 views

### CDF player Inputfield list

I want to work with lists within the CDF player. A very simple example, which works inside a notebook is ...
404 views

### Tally repeated evaluation of function

How can I tally the result of repeated evaluation of a function? n=100000; f[]:=RandomInteger[{1, 4}] Tally@Table[f[], {n}] When ...
650 views

### BoxWhiskerChart with logarithmic axes

I would like to make a following chart Ideally I would also like to control the boxes position on a logarithmic x-axis. Some inspiration how to do the latter may be found in the answer to my ...
2k views

### Given x[u,v], y[u,v], and f[x,y] how do I find D[f,x] in terms of u,v?

I have two functions x = x(u,v) and y = y(u,v). The chain rule says that for a function f(x,y), df/dx = df/du du/dx + df/dv dv/dx, and similarly df/dy = df/du du/dy + df/dv dv/dy. How do I get ...
215 views

### How do I avoid the gaps introduced by a frame on a plot?

You can see that there are gaps on all sides of the plot between the frame and the extent of the line that I've plotted. How do I get rid of these? I'd like the frame to cover $[0,1]\times[0,1]$ and ...
290 views

### How can I get the general term of this recurrence equations?

Following is the recurrence relation: a[1] = 1; a[n_] := a[n - a[n - 1]] + 1 Array[a, 28] I tried to use RSolve, but it ...
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292 views

### How to display detailed output in Mathematica [duplicate]

Possible Duplicate: Get a “step by step” evaluation in Mathematica How does Mathematica integrate? I want to display more detailed output from a calculation. The default command for ...
376 views

### Using NDSolve solution as initial condition for another NDSolve

I have solved a PDE numerically using NDSolve, and I now need to be able to use that solution as an initial condition for another ...
2k views

### why I can't define a commutator operator in this way？

I am trying to define some operators I used frequently. For example, I defined a KroneckerProduct operator as $\otimes$ as follows: ...
942 views

### Why does Mathematica fail to solve my equation?

I am trying to solve an equation using Mathematica, but I keep getting the following error Solve::nsmet: This system cannot be solved with the methods available to Solve. More importantly, ...
569 views

### Calculating orbital period for the logistical map [closed]

I have the following MatLab code ...
621 views

### Can a LatticeData image be displayed in a space filled fashion

I'd like a FaceCenteredCubic image as in the in LatticeData docs, but space packed, and cropped on all the boundaries, so that it illustrates the geometry of the calculation that leads to the ...
406 views

### Functions that remember their values

Can someone explain what is going on with the following ... func[y_] := func[y] = (Print["Hello world !!!"];) func[1] Hello world !!! ...
2k views

### Interpolating 2D data [duplicate]

Possible Duplicate: Interpolating 2D data with missing values I am trying to interpolate a 21x21 array of values. The 21x21 array sometimes has zero values and with the help of ...
938 views

### How would I improve this Karaoke machine code?

I was looking at a large collection of Import/Export user suggestions the other day and it dawned on me that we finally have MIDI import in Mathematica 9, which is rather interesting since MIDI ...
136 views

### What is the difference between Block and Module? [duplicate]

Possible Duplicate: What are the use cases for different scoping constructs? I don't understand the difference between the Matheamtica functions Block ...
320 views

### How do I place a graphical marker (box, circle, …) in a MatrixPlot?

I'm trying to locate minima / maxima in matrices on a heat map. So I have my 2D matrix and did a MatrixPlot, and I can find the position of the smallest value. ...
266 views

### How can I expand a inequality with Abs

I want Abs[x] + Abs[y] <= 1 to be convert to ...
765 views

### Make the code shorter for solving Fizz buzz

Here is Fizz buzz Write a program that prints the integers from 1 to 100. But for multiples of 3 print "Fizz" instead of the number and for the multiples of 5 print "Buzz". For numbers which ...
172 views

### Can this Part shortcut key be made to work with version 9?

In version 8 I was a frequent user of the "Use shortcut keys to easily type〚 and 〛" trick. In version 9, when I try to make the necessary change to ...
2k views

### How do I draw lines perpendicular to contour lines on ListPlot3D?

I am plotting the voltage in a pool of water with two electrodes. I have contour lines on my graph at every volt, but I would like to show the electric field lines which are going to be ...
1k views

### Interactive 3D plot in web browser?

Are there any ways to show a mathematica plot in a web browser so that the user can rotate it and such? I am open to embedding it in a web page - or some other method such as porting it to a ...
1k views

### How to understand and use DSolve solution

This equation is simple to DSolve in Mathematica, but I don't know how to use and understand solution. ...
272 views

### How to control Boundary conditions after integrating over piecewise function?

The following code ...
668 views

### Fitting parameters of user defined function returning discrete values

So, I'm fairly new to Mathematica (apologies in advance for the noobiness), and I'm having some problems regarding fitting the parameters of a user defined function to data. I'll give a representative ...
3k views

### How do I plot a solution of a differential equation?

I am having trouble generating a plot for a solution to my differential equations. I always end up with just blank axes. ...
76 views

### Consistently annoying error messages in Mathematica 9 [duplicate]

Possible Duplicate: Strange ::usage behavior in v9 Has anyone had any issues with a function, let's call it Function, which worked in Mathematica 8 getting the error message ...
771 views

### How to rebuild original data from a histogram?

I have data in the following form. I have a list of values and a list of frequencies that indicate how often each value has occurred. Example list of values: ...
143 views

I have created a grid, and also made a list of control objects(ex:inputfields, buttons, etc..). Then, I lay the list in my grid. There is no problem. However, the final layout takes a lot of time. I ...
264 views

### Welcome screen (V9): selecting notebook from Open Recent … results in initialization cells not evaluating

The following represents an abbreviated example of more complicated code, but it replicates a problem the more complicated code encounters. ...
160 views

### How to write a MathLink function in C that returns nothing

What is the proper way to write a C MathLink function that returns nothing at all? The following works, but I'm not sure if all this work is actually necessary: The template file: ...
1k views

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835 views

### Vlookup function as Excel in Mathematica

How can we create a Vlookup function, similar to what we have in Excel? So if we have a table a and another b, we could add ...
310 views

### Using LinkSnooper for monitoring the communication with an installable MathLink program

How can I monitor the communication between an installable MathLink program and the kernel? Can LinkSnooper do this?
265 views

### How to transform equation

Is there any possible way to write this equation of 4th order as a system of two diff equations of second order with two new variables and to do that automatically? statespace command is transforming ...
418 views

### Sinusoid modelling

There are lots of great demonstrations that show how to get periodic functions in the unit circle. I'm wondering how hard it would be to simulate a "moving grid" similar to this video on youtube ...
1k views

### How can I deal with an NDSolve::ivone message regarding boundary values?

I have a question regarding the error message: ...
137 views

### Programming Mathematica - Introduction by Paul Wellin [duplicate]

Possible Duplicate: Where can I find examples of good Mathematica programming practice? Can anyone recommend a decent book on programming mathematica ? I came across this which looks to be ...
155 views

### how to print stack trace when TimeConstrained times out

According to the documentation, TimeConstrained generates an interrupt which interrupts the computation. This interrupt is treated just like an abort, at least in ...
462 views

### Determining the partitioning of Do loop iterations between kernels?

Say I have some Do loop that I'd like to evaluate in parallel: Do[Something, {i, 1, M}]. I'd like to split this list up into ...
1k views

### BoxWhiskerPlot - how to specify boxes position on the horizontal axis

Let's say I have a folowing set of data: k = 1 : list of values k = 3 : list of values k = 10 : list of values I know that to make a BoxWhiskerChart I have to ...
182 views

### simplification rule with symmetry

What rule can you think of to replace the first line by the second? I have a bunch of expression like these, which I would like to simplify. All dependent cross terms must be written in the same ...
659 views

### Combinatorica vs Built-in functions: Use of MinimumSpanningTree

What kind of argument is expected by MinimumSpanningTree (from the package Combinatorica`)? Is it possible that I am providing ...