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Mathematica : Recent Questions and Answers (Page 47)

Find answers to your questions about Mathematica or help others by answering their Mathematica questions.

Find geodesics given two points

Suppose I want to find the geodesic on a paraboloid going through two points located on the paraboloid, using Mathematica 12. I chose the paraboloid parametrization as follows:paraboloid[{u_, v_}]...

Asked on 07/28/2021 by user2286339

1 answer

Facing text in 3D graphics with full options

I'm seeking a refinement/extension of the excellent and very valuable solution appearing here. That solution indeed allows you to place text anywhere in a 3D graphics and then rotate...

Asked on 07/27/2021

1 answer

Partial differentiation second order

I have some rules for differentiation:myD[-a_, o_] := -myD[a, o];myD[a_, -o_] := -myD[a, o];myD[a_ + n_, o_] := myD[a, o] + myD[n, o];myD[a_ b_, o_] := b myD[a, o]...

Asked on 07/27/2021

1 answer

Interrogating a running evaluation

Is it possible to find the values of variables of a running Mathematica evaluation, without interrupting it? For example, suppose I do:Do[Pause[1]; a++, {50}]and then afterwards realize that the...

Asked on 07/27/2021 by Carl Woll

4 answer

Compile and NSolve

Consider the following numerical problem. One deals with transcendental complicated function f that depends on several parameters and three variables, say x, y and z. One wants to find roots...

Asked on 07/27/2021

0 answer

How to make a LocatorPane Appearance option dynamic?

I have a DynamicModule that contains a LocatorPane. The number of locators can be changed. The locators are labelled with a number. When the number of locators are changed the...

Asked on 07/27/2021

1 answer

Tooltip/EventHandler misaligned with scaled graphics primitives they wrap

Bug introduced in 8.0 or earlier and persists through 12.2 It affects all event based wrappers for affected primitives. E.g. EventHandler. Which makes it a big limiting factor. For more...

Asked on 07/27/2021

0 answer

How do you ask someone to input the values of a matrix?

I'm trying to set up code that basically asks the user to input the values of a matrix with a certain key size. I want them to first enter the...

Asked on 07/27/2021 by Alex Konar

1 answer

Why does shift-drag resizing a DateListPlot cause the line to disappear?

Start with the following plot:DateListPlot[FinancialData["IBM", "Jan. 1, 2004"]]I want to resize it to make it a bit wider, so I use SHIFT + Mouse1 on the right-bottom corner handle...

Asked on 07/27/2021

0 answer

Implicit region misses definitions

I'm running the codeeq1[v_] := eq1[v] = v[[2]] + Tan[[Pi]/6] v[[1]];In[271]:= Region@ImplicitRegion[eq1[{x, y}] == 4 && 0 < x < 2, {x, y}]Out[271]= Region[ImplicitRegion[And[And[80.61330507707726, 0 < x <...

Asked on 07/27/2021

0 answer

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