1
vote
1answer
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 ...
8
votes
2answers
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, ...
8
votes
3answers
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] : ...
1
vote
1answer
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: ...
0
votes
1answer
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 ...
8
votes
2answers
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 ...
7
votes
2answers
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 ...
1
vote
1answer
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 ...
5
votes
1answer
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 ...
3
votes
1answer
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 ...
7
votes
1answer
372 views

How can I define a function that can accumulate its parameter?

For example, write a function add: add[3] return 3 add[4] return 7 add[10] return 17
0
votes
0answers
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 ...
2
votes
1answer
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 ...
6
votes
2answers
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: ...
0
votes
1answer
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, ...
0
votes
1answer
569 views

Calculating orbital period for the logistical map [closed]

I have the following MatLab code ...
12
votes
1answer
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 ...
10
votes
2answers
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 !!! ...
0
votes
1answer
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 ...
22
votes
0answers
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 ...
4
votes
0answers
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 ...
7
votes
1answer
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. ...
3
votes
3answers
266 views

How can I expand a inequality with Abs

I want Abs[x] + Abs[y] <= 1 to be convert to ...
5
votes
6answers
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 ...
3
votes
1answer
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 ...
5
votes
2answers
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 ...
6
votes
2answers
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 ...
0
votes
1answer
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. ...
1
vote
0answers
272 views
1
vote
1answer
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 ...
5
votes
2answers
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. ...
1
vote
0answers
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 ...
10
votes
4answers
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: ...
4
votes
1answer
143 views

Loading graphics consumes execution time

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 ...
3
votes
1answer
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. ...
6
votes
1answer
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: ...
2
votes
1answer
1k views
13
votes
2answers
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 ...
10
votes
3answers
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?
1
vote
1answer
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 ...
10
votes
3answers
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 ...
5
votes
1answer
1k views

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

I have a question regarding the error message: ...
2
votes
0answers
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 ...
5
votes
1answer
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 ...
3
votes
1answer
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 ...
5
votes
3answers
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 ...
0
votes
1answer
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 ...
3
votes
1answer
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 ...
6
votes
3answers
656 views

How can I rewrite this with NestList or FoldList?

The original code used For: ...
51
votes
3answers
2k views

Applying TextRecognize on alpha-numerical table

From time to time I have to extract data from scanned papers or rasterized PDFs. Imagine a table of the following kind (but much longer): A naive application of ...

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