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0
votes
2answers
47 views

Integrating a half-normal pdf

The pdf of a half normal distribution is: $\frac{\sqrt{2}}{\sigma\sqrt{\pi}}$exp$\left(-\frac{x^2}{2\sigma^2}\right)$, $x>0$ ...
3
votes
2answers
39 views

Mathematica: Extract the piece that contains x=0 from within a piecewise function

In mathematica, I have a piecewise function similar to: Piecewise[{ {x^2 + 2*x - 4, 0 <= x <= 1/4}, {0, true} }] I don't ...
0
votes
0answers
19 views

Subscripts and Simple Forumlas giving unexpected answer [duplicate]

I trying to do a tensor problem but for simplification I'll only ask for assistance with one simple part. I set my variables using subscripts like so.. $Subscript[y, 1] = - .23556;$ But when I try ...
0
votes
2answers
34 views

Combine two functions in mathematica to get one image with two elements

I am trying combine this two functions into one piece in grid. ...
0
votes
0answers
23 views

Density matrix - Mathematica [duplicate]

I would to write a density matrix "matr" related to a quantum system in a mixed state. "Ham" is the Hamiltonian of N-spin system. The code I wrote is: ...
0
votes
3answers
93 views

Mathematica plotting help (plotting a complex fourier series). [duplicate]

How would I plot the following in Mathematica? $ \displaystyle\sum_{n=2}^{10} \bigg(\dfrac {4ine^{inx}(-1)^n}{(n^2 - 1)^2} - \dfrac{4in e^{-inx}(-1)^n}{(n^2 - 1)^2} \bigg) $ Thanks.
20
votes
0answers
147 views

Managing Stack Exchange favorites via Documentation Center

My Stack Exchange favorites are getting bigger and bigger. It is becoming unmanageable and is getting hard to find what I look for. A related question is Sort favorite questions. Is it possible to ...
0
votes
0answers
28 views

Differential equation [duplicate]

Why mathematica not solve this equation: In: DSolve[{z''[t]==(z'[t])^2+(z[t])^2-Sin[t]-1, z[0]=0,z[Pi/2]=1},z[t],t] Out: DSolve[{z''[t]==(z'[t])^2+(z[t])^2-Sin[t]-1, z[0]=0,z[Pi/2]=1},z[t],t] ...
0
votes
0answers
35 views

Is there a way to add arrows along a parametric curve inside a manipulate function (Mathematica)? [duplicate]

I cannot find a way to add arrows along a parametric curve that I used NDSolve to get. I have written everything inside Manipulate. ...
3
votes
0answers
89 views

rule transformations for compositions of tensor products

The tensor product satisfies far commutativity: $(f \circ g) \otimes (h \circ k) =(f \otimes h) \circ (g \otimes k)$. I have some replacement rules I'd like to apply to an expression containing ...
1
vote
2answers
70 views
0
votes
0answers
48 views

Mathematica: How to apply a function to a list of tuples [duplicate]

trialList = {{0, 24.701}, {1, 24.69}, {2, 24.733}}; f[x_] = x + 1 I would like to apply the function f(x) to only the second element of each tuple. How is this ...
9
votes
4answers
428 views

How do I change the way Mathematica pronounces English words (e.g. “futile” is not pronounced correctly)?

I am absolutely desperate. I cannot get my Borg to pronounce "futile" correctly. Speak["Resistance is futile."] Leo pronounces "futile" as expected and there is ...
14
votes
1answer
206 views

Is there an issue tracker for already reported Mathematica bugs?

Since I'm working at least 50% on Linux which is probably the operating system which gets not so much attention from Wolfram, I find new bugs regularly. What bothers me the most is, that tracking a ...
-1
votes
1answer
180 views

TimeConstrained[] not taking full amount of time

I am using Mathematica to evaluate an integral within a given time constraint. Note that I have read in values of 'BigList' or BL from a file. If the file has a ...