# All Questions

27 views

### Something wrong in Resolve?

In[17]:= Resolve[ForAll[x, Sqrt[x] \[Element] Reals, x >= 0]] Out[17]= False I have tried to simplify an expression, but could not get the result I want. Then ...
25 views

### How can i enter this formula into wolframalpha ? [on hold]

http://www.wolframalpha.com/input/?i=x!*%28n-x%29!+%2F+n+!+*+%28sum+1%2Fk*%28+%28n-k-1%29+choose+%28x-1%29+%29%2C+k+%3D1+to+%28n-x%29+%29%2C++x%3D10%2C+n%3D100? I want to change x and n, and look at ...
27 views

### Export to JSON format specifically for MongoDB

It is a nice thing that, if you have a data as a list of rules (even nested), Mathematica can export them in JSON format. After generating useful data in Mathematica, Therefore, it seems it ought to ...
29 views

### Assigning to a variable with a computed name [duplicate]

I wish to assign about a dozen variables to complicated expressions. to ensure that the correct variable is assigned to the correct expression, I’d like to do something resembling ...
50 views

My code is ...
32 views

### Function taking arbitrary number of arguments

I have a very similar function to that which a solution was provided by kguler, but am unsure as to how to adapt the solution that was given there. That post can be seen here. The adaptation is only ...
46 views

### Exporting Data file in .dat format [duplicate]

Here I'm solving two simultaneous to get different values of the roots depending upon another variable 'x'. I've written up to the following using 'Find Root' ...
312 views

### How to sum over primes

Apologies in advance for the simplicity of the question, but I can't fathom how to write the following as a sum in Mathemaitca: \begin{align} &\sum_{p}^{a}\sum_{n}^{b}\text{expression} ...
102 views

### Modify ticks without specifying tick length

I am making a ListPlot, in which the x-axis is the result of AbsoluteTime. I want the tick text to be human-readable by applying ...
78 views

### Slow-down encountered when using NMinimize with a compiled function

I'm minimizing a large function. Evaluating the function is very slow symbolically but using Compile I can get ~100x speed-up on this step. However, despite this, the NMinimize process is only ...
49 views

### How to make Mathematica show intermediate steps in integral [duplicate]

I want to know how Mathematica evaluates this integral: $PV \int _ {0} ^ {i \infty} d \tau \, \frac{e^{-\frac{\tau^2}{2 M^2}}(b^2 - 3 τ^2)^2 (|b^2+\tau^2|-(b^2-\tau^2))}{\tau (\tau^2 - b^2)}$, where ...
49 views

114 views

### How to set viewpoint Graphics3D to a different default orientation?

I'd like to have a SphericalPlot3D show up with the "z-axis" oriented horizontally by default. For example, in ...
69 views

### amplitude-phase modulation equations solution

I am trying to solve the following equation ...
38 views

### PrecedenceForm with Format

I'd like to format the output of certain operators with Infix-style formatting to have lower precedence than Times. Let's say I ...
34 views

### Time dependence [on hold]

Given the potential energy P[r_] of interaction between two points and their weight m1, m2, the initial velocity v10, v20 and initial positions r10, r20 of the two points. ...
51 views

### Draw filled regions in DateListPlot

How do I draw specifiq filled regions in DateListPlot? I trying to plot something like this: Thanks
28 views

### All output in TexForm [duplicate]

In the Preferences -> Evaluation panel, there are only options for StandardForm, TraditionalForm and ...
63 views

### Font presentation difference between version 9 and version 10

I am trying to make presentation quality bar charts. As part of my effort, I used the code below. Updated to eliminate font specification. The problem appears to be a rendering difference, not a font ...
183 views

### Finding if a point is in a region bounded by a curve and the axes (curve made of discrete points)

Here's a small example this is not the real curve but a simple example I made for this question. Here's the plot of a list with a point A of known coordinates. Now I need to find if the point A ...
33 views

...
59 views

### Find algorithm or generator formula with automated procedure and pattern recognition

I am trying to find a generator formula for the discriminant of a polynomial and believe it would be an interesting problem for the Mathematica community to know how to automate evaluation of certain ...
127 views

### Line integrals over a path defined by a set of points (rather than an analytic formula)

I'm getting inaccurate results when computing (plotting) the value of a function against the length of a line integral, where the path comes from a set of numerically calculated points. (In contrast, ...
61 views

### CDF Player 10.0.2 does not launch

I have recently downloaded the new CDF Player 10.0.2. I export a CDF, and create an HTML page, to host the CDF, using the code provided by Mathematica 10.0.2. When I open the HTML page in Chrome ...
46 views

### Ctrl+Shift+K and it's strange behaviour [on hold]

I am used to keystroke Ctrl+Shift+K for autocompletation and template inserting. The problem is following: sometimes I press something unintended and Ctrl+Shift+K work like commenting by ( *Func...* ) ...
46 views

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46 views

### NDSolve printing error message NDSolve::ndode [on hold]

Using NDSolve while solving system of ODE's. Here is my try ...
43 views

### How to use pattern matching for integral identities?

I have an unknown pdf f[x], and I need to express integrals involving f[x] as expansions of the moments of f[x]. For example: ...