6
votes
0answers
154 views

Where is f2mma.zip, Fortran to Mathematica converter?

I want to convert the SOFA libraries to Mathematica, and found out about f2mma, a Fortran to Mathematica converter. Google points to many papers about f2mma, but the only link to the software ...
0
votes
2answers
88 views

Setting up two ordinary differential equations [closed]

Just having a total blank at the moment, I realise that maybe this question would best be suited for a math forum but i assume Mathematica is needed in order to solve these equations. So the question ...
4
votes
2answers
302 views

Why does having many Print statements slow down my code?

I have a code that I need to debug. I have put a Print[] into it that should give about 10^4 prints for table entries. I know that 10^4 is large, and this exposes ...
-2
votes
1answer
79 views

Sign of a symbolic expression as a function of parameter values

I need to know the sign of the following expression for p[t] = z/(1-a), as a function of the parameters {a, b, c, z}: ...
1
vote
0answers
123 views

Extract peaks from image

EDIT: I've managed to solve the problem by using "Get Coordinates" on a couple of points and then figuring out the affine mapping by using the values they're supposed to be at, and applying that ...
4
votes
1answer
192 views

How to further accelerate arithmetic with Fermat Pseudoprime and Fibonacci number

I've been working on this all night, and I have made this go pretty fast, compared to my first iteration of the program, but now I'm out of ideas. I'm trying to write a program to test (by good ...
3
votes
3answers
159 views

How can I customize the tooltips on a ContourPlot?

I have a contour plot and I would like to have finer control over the tooltips that are displayed. For the sake of argument, suppose that I have the following plot, ...
5
votes
1answer
82 views

RandomGraph with specific constraints

I need to generate random connected simple graphs (no loops) with the constraint that exactly two vertices must only have a single edge. I can create many connected graphs (but very few will have the ...
1
vote
2answers
131 views

How to cut imported audio?

How to cut an audio clip imported by the Import function? E.g. I'm interested in the content starting from the 100th sample up to the 200th. I'd like to avoid ...
1
vote
1answer
77 views

Want to display a animation necklace when updating a list of suggestions from an inputfield search

I have an InputField search that provides search suggestions, but I want an animation necklace to be displayed while the search is 'busy'. I would also like this to be done using Dynamic rather than ...
18
votes
2answers
297 views

How can I make Plot show the plot while it's computing it?

Normally, Plot acts like a black box and only gives you the requested plot once it has finished computing it. However it can be useful, other than interesting, to ...
4
votes
1answer
202 views

Sow only if different from zero

I am trying to collect elements with Reap and Sow, where I am interested only in non-zero elements, that is I am trying something like that ...
1
vote
0answers
56 views

ImageAssemble and Export gif takes too much memory

Errr.... First Let's create some gifs: ...
1
vote
1answer
141 views

Hill function (equation) vs a gene

So im trying to make one equation equal another to solve for all physically realistic values of $X$. Hill function is: $$ F(X)=\frac{1}{1+(\frac{X}{K})^n} $$ and Gene Z equation is: $$ Z(X) = -\...
0
votes
1answer
65 views

Graphing a function with specified input domains

My goal is to plot the function $f(x)=x^2-2$ where $x$ is a positive rational. It seems Mathematica assumes one always wants to plot a function for real inputs (and correspondent restrictions on the ...
0
votes
1answer
167 views

What kind of algorithm can be used to map image coordinates to cylinder coordinates

I plan to flatten an images on curved surface(eg: jar or door knob) and I found a pretty good post which helps me a lot :)(link below). However, I still confuse on how to map image coordinate to ...
2
votes
2answers
139 views

A problem with Manipulate

I have: ...
5
votes
1answer
367 views

Why should we make sure the calculated MD5 is of length 32?

I see when people write code on calculating MD5, (even in the documentation), they write like this: IntegerString[Hash[something, "MD5"], 16, 32] But I think ...
1
vote
2answers
181 views

How to write absolute value and square root in one equation?(runge kutta) [closed]

I got some problem when I run my program. It hangs when I run it. This is my coding for runge kutta Geometric mean(RKGM). ...
3
votes
1answer
123 views
0
votes
2answers
65 views

Function works only after printing variables inside [closed]

For the input: pickTwoParts[{a, b, c}], the right output is: {{a, a b, a c, b, b c, c}, {b c, c, b, a c, a, a b}}. I am getting that output, but only after uncommenting the lines: ...
1
vote
1answer
314 views

How to use Table to assign values to variables in a list?

I'm trying to do the following: R = {a, b, c, d, e, f, g, h, i}; Table[R[[n]] = RandomInteger[{0, 20}], {n, 1, Length[R]}] My intention is to assign a random ...
5
votes
3answers
530 views

How to find max difference with the same x between two functions?

For example, I have function TF[y_] = 2 / Pi * ArcSin[y] And I have CDF: ...
0
votes
1answer
86 views

Problem with ReadList, record separator is not working

I have entries in a file with the following form: 3579038 2cc567cda3afd5e1d5406152e8ba77024c46ecda 2742564 4202599 093e88c26bd1637d12253115bd5a8a81531ba68f 2742821 3579039 ...
1
vote
1answer
82 views

Trying to find solution for system of ordinary differential Equations [closed]

I've got 2 functions: A'[t] = (0.5/(1 + (B/k1)^n)) - 0.2*A B'[t] = (1/(1 + (A/k2)^n)) - 2*B with conditions of ...
5
votes
1answer
80 views

Rotated strings wrapping inside Item of Pane, vs their ItemSize or “ImageSize” spec

Why in this: Grid[{{Item[Rotate["this is a long text example", Pi/2], ItemSize -> {2, 10}]}}, Frame -> True] or this ...
3
votes
2answers
85 views

understanding a mathematica equation

I have found the equation below written with Mathematica, I looked at the Mathematica online guide but it is still difficult to understand the equation. Can someone write this (or part of it) in ...
1
vote
0answers
120 views

Manipulate - 3 sliders for a list of 3 elements [closed]

I'm trying to create a slider for a list of 3 elements. I know that I can create a 2D slider for a list of 2 elements and it's impossible to create a 3D slider for a list of 3 elements. So, I just ...
2
votes
2answers
120 views

FindDistributionParameters gives an error for a mixture of user defined sinh-arcsinh distributions

I have some data (1593 values). I first binned it using the Knuth rule and fitted a function that is a linear combination of two sinh-arcsinh functions. I then ...
3
votes
1answer
212 views

How to hide and show graphics within Show (in Manipulate)

There is a well documented way to "Dynamically Hide and Show Plots" (link). In the example 'Opacity' option is effectively used. Is there an efficient way to make the same functionality with "Show"? I ...
2
votes
1answer
73 views

How to write a function that returns the combined output of several built-in functions

I am trying to make a module that takes a Boolean function, and prints the following: the function's truth table the function's NOR epxression the function's minimal Disjunctive normal form So far ...
-2
votes
1answer
184 views

Mathematica's steps towards the result of a definite integral

I am interested in this definite integral: $$ \eqalign{\int_0^\infty {x^2 \log(1-e^{-x})}\; dx\cr } $$ That is: ...
4
votes
1answer
150 views

ANOVA test on dataset

I have a dataset with 3 groups and two variables. I want to do ANOVA test on the three groups for each variable. Does anyone know how to do this? ...
3
votes
1answer
88 views

Map with multiple arguments

I have a function f[m,n] and a list of arguments args = {{m1,n1},{m2,n2},{m3,n3},{m4,n4}, ...} that I want to apply to it. I ...
3
votes
1answer
179 views
0
votes
1answer
143 views

nonlinear differential equation

For such a equation $$-y''(x) + x^2\cdot y(x) - |y(x)|^2\cdot y(x) = 0$$ with initial conditions: $y(-500) = 0$ and $y(500) = 0$. I write in mathematica ...
6
votes
2answers
342 views

Filtering of an unwanted frequency through a Fourier Transform

I have a data set with evenly spaced data points. The plot is frequency vs. intensity. The overall shape of the plot is an upwards curve into a plateau, this cannot be seen in the data as this is an ...
12
votes
1answer
266 views

How can I make FilledCurve smoother?

In How can I generate and randomly assign color to annular sectors? J.M. showed an interesting way to create a sector graphic using FilledCurve. Unfortunately it ...
2
votes
1answer
67 views

Forcing a locator button to remain on the surface of a sphere

This question may or may not be possible and might be a hard one to answer. Suppose that I have a sphere centered at the point (1,2,-1) with radius 3. Is it possible to place a locator button on the ...
14
votes
4answers
295 views

Does Mathematica have an equivalent of C's nextafter?

In C (and many other programming languages), there is a function double nextafter(double x, double y) which takes two (IEEE 754) floating-point numbers and ...
10
votes
2answers
474 views

Does Mathematica have an equivalent of Python's float.as_integer_ratio?

The Python programming language has a float.as_integer_ratio(x) function which exactly converts an IEEE 754 floating-point number into a numerator/denominator pair ...
1
vote
1answer
116 views

Changing from Dashed to Solid

I have: Graphics[{ Blue, Thick, Arrow[{{0, 0}, f1}], Arrow[{{0, 0}, f2}], Red, Arrow[{{0, 0}, f1 + f2}], Dashed, Blue, Line[{{-9, 0}, {12, 0}}] }] ...
1
vote
1answer
84 views

How to reduce trigonometric expressions under special conditions

For the following problems I used "FullSimplify" and "TrigReduce" but I manage to reduce more by hand. ...
1
vote
1answer
100 views

Add a portion of a unit circle

Consider: ...
7
votes
2answers
101 views

Undo history cleared after removing comments - bug?

If I've written some code followed by a comment, like this: x(*y*) and I remove the comment by first removing the right delimiter and then the left, my undo ...
4
votes
1answer
87 views
0
votes
0answers
130 views
1
vote
1answer
86 views

Diff eqs can be solved?

I'm trying to solve a pair of coupled differential equations, but am having trouble making DSolve evaluate my equations. ...
1
vote
1answer
85 views

Import a jpeg file and a mov file and display them side by side

I am planning to use Mathematica for a presentation. In one of the slides I need to place a jpeg file side by side to a mov file. ...
0
votes
0answers
40 views

Create graph K5, delete 2 edges and 2 vertex, create adjacency matrix [duplicate]

I need help about this problem. I should create graph K5, delete 2 edges and 2 vertex from it and from the new graph create adjacency matrix. I have poor knowledge and i don't need anyone to solve the ...

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