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Questions tagged [backslide]

Tag for questions about backslides/backsets/degenerations/degradations/regressions/retrogressions in newer versions of Mathematica, notice this tag isn't for bugs and compatibility issues.

4
votes
1answer
45 views

Automatic PlotRange based on Interpolation results

We generally use PlotRange->All to see all available points in a plot. But how do you use PlotRange when you want to run it ...
8
votes
1answer
118 views

11.3 - import of files with paths containing non-ASCII characters [duplicate]

Import: Version 11.2 works correctly, no problem with non-ASCII characters in the path of file. But upgrated version 11.3 a) does not import these files b) ...
2
votes
1answer
115 views

Strange rendering of graphics exported as .pdf

Bug introduced in 10.4.1 or earlier and persisting through 11.1.1 Bug isn't present in version 8.0.4 I am trying to export a graphic generated by the following code to a .pdf file. ...
16
votes
2answers
336 views

Backslide in NSolve in V11.1?

Bug introduced in 11.1.0 and persisting through 11.1.1 In V11.1, NSolve[BesselJ[0, x] == 0 && 0 < x < 20, x] returns no solutions: But in V11.0 (...
8
votes
4answers
309 views

Limit problem no longer works in Mathematica 11.1.0

In Mathematica 11.0, the following limit, Limit[Power[Sqrt[((1 - 4 n)/(3 n + 2))^(3 n)]^2, (n)^-1], n -> ∞] gave me an answer of $e^{6 \operatorname{arctanh}(...
0
votes
1answer
93 views

NSolve claims there are no solutions in Reals but finds them without restriction to Reals

When trying to answer this question I've discovered what looks like a bug in NSolve introduced in version 11.1.0. $Version <...
7
votes
1answer
163 views

SumConvergence difficulty

Backslide introduced in 9, persisting through 11.2. Consider the series $\sum_{n=1}^\infty\sin\frac{50}{n^2}$. The terms are eventually positive. ...
7
votes
2answers
252 views

NDSolve with Piecewise solving BVP gives warning bvdisc [duplicate]

Backslide introduced in 9.0, persisting through 11.0.1 I try to solve a boundary value problem of coupled ODEs. For reference, when I solve this set of equations it works without any problems: ...
5
votes
3answers
87 views

a Sum that no longer evaluates

At http://forums.wolfram.com/mathgroup/archive/2000/Sep/msg00318.html and http://forums.wolfram.com/mathgroup/archive/1999/Jul/msg00375.html we see an apparently successful evaluation of the ...
14
votes
1answer
207 views

Interesting Progression of ParametricRegion: Bug?

Bug introduced In 10.1 or earlier and fixed 11.1 Consider the following ParametricRegion from an answer to this question: ...
15
votes
1answer
277 views

Why does ImageFilter fail with radius 1, but works with radius 2?

Bug introduced in 9 and persists through 11.2.0 When thinking on a way to answer this question using ImageFilter I have found (with Jason B's help) that we can ...
27
votes
1answer
323 views

Regression /Bug in DelaunayMesh from 10.3.1 to 10.4

Bug introduced in 10.4 and persists through 11.1 In answering this question, I realized the OP and I were obtaining different results from the alphaShapes2D code. ...
14
votes
1answer
901 views

How to solve the tsunami model and animate the shallow water wave?

Backslide introduced in 9.0, persisting through 11.3. Recently when I was learning differential equations, I noticed there is a shallow water wave equation to model the tsunami propagation. How to ...
4
votes
0answers
119 views

Why does Solve work in v9.0.1 but not in v10.3.1

I want to solve the following DE $$ P'=k(M-P)P, P[0]=53.08, P[50]=23.192, P[100]=76.212.$$ The Mathematica command is ...
5
votes
1answer
184 views

This code worked so slow on version 10 but not on earlier version

Backslide introduced after 9.0.1, persisting through 11.3. ...
7
votes
1answer
887 views

Mathematica 10.2 is slow to NIntegrate highly oscillatory integrals

I noticed that Mathematica V10.2 is taking much longer to run my code when compared with V9. One function that seems affected is NIntegrate. For example, for a ...
9
votes
2answers
270 views

NSolve finds real-valued results in version 9, but not in version 10

UPDATE Reals also was used in the code. Actually, I tried the following simple piece of code. ...
5
votes
1answer
112 views

Somewhat Irreproducible Integrate Results

Backslide introduced in v10 and persisting through v10.3.1. In the course of considering question 102922, I encountered erratic results from a particular integration. It is illustrated as follows. ...
5
votes
2answers
193 views

Symbolic integration of SphericalBesselJ

Backslide introduced in v10 and persisting through v10.3.1. Consider the following integral ...
8
votes
2answers
367 views

Can your Mathematica do the following integral?

Backslide introduced in v10 and fixed in v10.4.1. I was trying to do the following integral in Mathematica: Integrate[(z-2) PolyLog[2,z]Log[1-z]/z^3,z] What I ...
29
votes
1answer
357 views

Solve slower in versions 9 and 10

With some systems of equations, Solve is much slower in versions 9 and 10 than in earlier versions, apparently because it is doing more simplification of the ...
12
votes
2answers
530 views

Why Mathematica cannot apply The Fundamental Theorem of Calculus automatically?

For some reason Mathematica cannot evaluate this definite integral: ...
29
votes
1answer
610 views

Why is ListPlot so slow here?

While examining How can I monitor the progress of a Plot? I was surprised to discover that in some cases ListPlot in version 10.0 and 10.1 is orders of magnitude ...
45
votes
1answer
913 views

Is FullGraphics an abandoned function? Is there an alternative?

FullGraphics hasn't worked entirely for a long time and the situation appears to be getting worse instead of better. In Mathematica 10.0, 10.1 up to 11.3 a simple ...
29
votes
1answer
492 views

many indefinite integrals do not evaluate in 10.1, looking for the cause

Bug introduced in 10.1 and fixed in 10.2 Many integrals no longer evaluate in V 10.1 when they did in 10.0.2 Here are some 23 integrals as an example, that all produced results in V 10.0.2, but now ...
20
votes
4answers
1k views

Expansion of a hypergeometric function takes ages with Mathematica 9 and 10 (regression?)

Mathematica 8 (Linux version) can evaluate AbsoluteTiming[Series[Hypergeometric2F1[1, 1 - eps/2, 3 - eps, 1/2], {eps, 0, 0}]] in no time. On one of the ...
8
votes
0answers
165 views

Regarding Evaluated True

Done a bit of reading: Normal[Series[ ]] does not give a normal expression Regarding the Evaluated->True, consider: ...
24
votes
2answers
442 views

Backslide of Limit

Backslide introduced in 9.0, and persisting through 11.3 A friend of mine showed me this example: Limit[Sum[Sin[Pi*k/n]/(n + 1/k), {k, 1, n}], n -> Infinity] ...
7
votes
1answer
2k views

NDSolve and Piecewise functions [duplicate]

Backslide introduced in 9.0, persisting through 11.0.1 I want to clarify upfront, This is not a please help me get the answer to my homework question. I know what I need to do I just do not know how ...
9
votes
3answers
2k views

Can NDSolve handle discontinuous data?

Backslide introduced in 9.0, persisting through 11.0.1 It is possible to numerically solve a differential equation if not-smooth data are involved? For example the following instruction return the ...
26
votes
2answers
516 views

Performance regression for Fold?

I noticed an over 10x performance drop on Mathematica v9.0.1 (as Oleksandr R. commented, also v8) compared with v7.01 for this code: ...
35
votes
1answer
2k views

Mathematica 9 cannot solve this Integral. Mathematica 8 could. Is this a bug?

I was trying to (re)calculate a problem of an older Wolfram blog post (Problem 11457, by M. L. Glasser) with Mathematica 9.0.0.0 (on OS X 10.8.2). ...
3
votes
0answers
146 views

A recurrence equation that can be solved in version 7 but not in version 8

Backslide introduced in 8.0, fixed at least in 9.0.1. A friend of mine showed me this code sample: ...