# All Questions

125 views

### What are these strange shapes in my Plot3D[]? [on hold]

Plotting a function, I noticed some strange spots away from the main feature, the dark purple here: You can see that they don't actually have any curvature themselves: Strangely, you don't see ...
41 views

### Solving nonlinear system by newton method [on hold]

How to solve nonlinear system by newton method (without Findroot method)? What is algorithm?
124 views

### Making mathematica do regulated integrals

Consider the integration, $\int _0 ^\infty dx\ x \tanh( \pi x) \sqrt {x^2 + a^2 }$ where $a$ is a real number. This integral is divergent. We note that an asymptotic expansion of the integrand ...
24 views

### Making single letters non-italic in Graphics/Text/Style objects

Suppose that I use Graphics, Text, and Style to type one letter in the subscript of a letter ...
178 views

### Scan vs Map vs Apply

I cannot understand the difference between Apply, Scan, and Map. I have tried to play with ...
23 views

### How would I enable the Evaluate in place item of the Evaluate menu?

I would like to be able to suppress multiple outputs when a cell is evaluated. Is there a way to enable the "Evaluate in place" menu item of the Evaluate menu?
41 views

### solving simple integral equation [on hold]

Could someone help me finding q(t) so that $$\int_x^{x+2\pi/3}q(t)\,\mathrm{d}t = a\cdot\sin{(x)}+b$$ Thanks in advance!
13 views

### how to find find a matrix by the characteristic vlaues and vectors [migrated]

Now I am studying linear algebra course, In that for a given matrix we are finding the characteristic values (eigen values) and characteristic vectors (eigen vectors). But my question is why cant we ...
80 views

### Create new file, based on 500 articles

I've got a folder with 500 newspaper articles. Each article is saved in a seperate file with a number in the title like "1.txt", "2.txt". Each article has a date but it is not clear in which line the ...
18 views

### Is it possible to suppress additive outputs when cells are evaluated? [on hold]

Is it possible to suppress multiple outputs when a notebook is evaluated? Ideally, I would like to have a notebook with single instances of output. Currently when I open a notebook, I have to ...
195 views

### Map structure of irregular list, Flatten then reconstruct list using structure

I'm trying to use Compile[] to improve the performance of an algorithm. The algorithm works on a set of matrices which are not of a similar shape. Unfortunately ...
111 views

### Recover data points from RGBColor of known ColorScheme

In general I want to recover the z-values from an image of a DensityPlot. A simple example might just be ...
37 views

26 views

### Open a pre-existing CDF file from a stand-alone CDF file

This is related to my previous question here A series of my questions are related to an important problem: It is important to be able to CDF-publish a document, and be able to open a separate ...
35 views

### Deciding lambda and integrate a function [on hold]

I want to decide lambda for this function I also want to integrate the same function. Please help!
48 views

### Equation in implicit form

This is simple example: v = {1.48622576, 1.53444276, 1.42299438} v/(v + 1) Out[1]:= {0.597784, 0.605436, 0.587288} In the above case expression v/(v + 1) is ...
23 views

### What is the function derivative [on hold]

What is the function derivative? f'(x)=? what is the way to the answer?
28 views

### How to set the values into some variables from different lists [on hold]

I have a list of Values and a list of variables. I want to set the Values into Variables. Assume the following code: ...
20 views

### Mathematica program for PLUR decomposition of a symbolic matrix using full pivoting

I wanted to ask if there is a Mathematica program for PLUR decomposition of a symbolic matrix M, such that M = P*L*U*R, using FULL (row and column) pivoting, and where R = reduced row echelon form of ...