Newest Questions
97,743 questions
3
votes
1
answer
103
views
How to preserve tooltips for SVG Maps created by Mathematica?
I want to produce an SVG map by Mathematica that preserves tooltips that are in Mathematica so that they are also in the SVG. The problem is that the tooltips do not export.
Here is an example:
That ...
- 687
3
votes
2
answers
130
views
Define meaning for symbol such as ⇓ despite 'Incomplete expression; more input is needed'
Example
The notation $a\Downarrow_bc$ can mean something like "the program $a$ results in $c$ when executed according to the semantics of $b$".
In Mathematica, I input this as ...
- 4,293
8
votes
0
answers
167
views
CollinearPoints returning True for noncollinear points
I think there might be an issue with CollinearPoints at least in the 14.2 Windows version I'm using. The issue arises where there are duplicate points and mixed ...
- 872
4
votes
2
answers
139
views
Matching an expression in Hold
Trying to replace some of the expressions wrapped by Hold as below to get $\frac{k d\theta }{dt}$, ReplaceAll does not replacing ...
- 1,484
4
votes
2
answers
294
views
Mathematica does not give me any contour here
I would like to have an idea what kind of curbe is being formed from the intersection of the plane $x+y+z=9$ with the surface
$\sqrt{16-x^2}+\sqrt{25-y^2}+\sqrt{36-z^2}=12$ under the restriction $x,y,...
- 634
0
votes
0
answers
32
views
StreamPlot doesn't plot symmetrically [duplicate]
StreamPlot doesn't plot symmetrically e.g. StreamPlot[{x, y}, {x, -1, 1}, {y, -1, 1}]. How to make it symmetric about x=0?
- 451
2
votes
1
answer
115
views
Using Partial derivative notation as a symbol
How to let the partial derivative notation \[PartialD] in an input cell have no built-in meaning, like \[DifferentialD] ? When ...
- 1,484
3
votes
1
answer
183
views
Mathematica ODE question
I am trying to solve an iterative matrix ODE of the form $f_k'(x)=T.f_k(x)+B(x)*S.f_{k-1}(x)$, where f is an $n$ dimension column, T and S are $n \times n$ matrices, and $B(x)$ is a function. The ...
- 169
3
votes
2
answers
244
views
How to find x ranges where a function is one-to-one and its output is in a given range?
I have a list of functions like this:
...
- 1,417
0
votes
0
answers
70
views
Verify a first integral of a complicated ODE symbolically
I have an ODE of the form:
y^{(4)}[x]==F[y^{(3)}[x],y''[x],y'[x],y[x]]
for some complicated (but explicit) $F$ -- the exact form isn't really relevant to the ...
- 101
2
votes
3
answers
227
views
In a nested, ragged list, pairing each element of one sublist with each element of another
This may be a silly question, and if it is, I'm willing to withdraw it. I have a list of lists myInitialList. I wish to write a function to transform ...
- 10.6k
5
votes
0
answers
69
views
Is it possible to modify the evaluation timestamp format?
There's an option in the options inspector to display a timestamp upon evaluation of a cell: Notebook Options → Evaluation Options → EvaluationCompletionAction → AddTimeStamp. That causes the date and ...
- 768
6
votes
1
answer
234
views
Is it valid for DSolve to return Indeterminate as a solution to a differential equation?
In V 14.3
Quit[]
ode=2*y[x]*D[y[x],{x,2}]==1+D[y[x],x]^2;
DSolve[ode,y[x],x,IncludeSingularSolutions->True]
Gives
Is it valid for DSolve to return ...
- 156k
4
votes
1
answer
149
views
How to Simplify 'unordered' lists of expressions
Say I have a list containing some expressions, for instance
...
- 357
3
votes
0
answers
135
views
Timing inside a compiled function?
I want to have multiple timings inside a compiled code. However, it turns our that AbsoluteTime[] does not work:
...
- 6,063