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by: MaplePrimes , Maple Calculator

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We have just released an update to Maple. Maple 2024.1 includes improvements to the math engine, PDF export, the Physics package, command completion, and more. As always, we recommend that all Maple 2024 users install this update. In particular, please note that this update includes fixes to ODESteps and simplifying integrals, as reported on Maple Primes. Thanks for helping us, and other users, by letting us know!

At the same time, we have also released an update to MapleSim. MapleSim 2024.1.1 includes improvements to FMU import/export, plotting, co-simulation, and more, as well as enhancements to the Web Handling Library.

## Interrupting Maple â€“> Evaluatingâ€¦ forever?

by: Maple

It can happen when an operation is interrupted by  that Maple does not return to  and still shows .

This can give the false impression that the Maple server in charge of the evaluation did not get the message to stop whatever it was doing.

By giving Maple an impossible task to solve analytically

```f1 := x1 - x1*sin(x1 + 5*x2) - x2*cos(5*x1 - x2);
f2 := x2 - x2*sin(5*x1 - 3*x2) + x1*cos(3*x1 + 5*x2);
solve({f1, f2});```

I have noticed in the Windows Task Manager that freeing allocated memory can take much longer than one might think.

In one case it took 30 minutes to free 24 Gb of total allocated memory (21 Gb of it in RAM/physical memory). In this case the interrupt button became active (turned from grey to red ) two times and memory continued piling up  again.

Lessons learned for me:

• The task manager is not only a valuable indicator for task activity but also for the interruption/memory freeing process.
• Before killing a whole Maple session and potentially losing the last state of a worksheet it can pay off to wait and repeatedly interrupt an operation.

Suggestion: When the maple server gets an interrupt request, it could report to the GUI that it is in an interruption state and is no longer evaluating input. For example changing the message in the status bar from Evaluating... to Interrupting...

## Maplesoft Application Center site search is terrib...

The original app center was excellent, they were .. "finessed" so to speak.  Then they changed it (like so many websites today most are clunky and they're all terrible, they don't work well, and I'm not just singling out maplesoft)  Most websites that are finely tuned are most likely based on old school programming, just recall the old days of mapleprimes - the forum was nicely done - but that's a debate for later. Now to the nitty gritty.

I did a search at maplesoft app center of a particular author, and I know he has at least 20 applications.  Only 3 came up, and the last app entry said more apps by this author but it kept disappearing and I kept getting thrown back to application #1 all the meanwhile looking like I'm scrolling further down in the list.

Maybe this is browser issue?  I'm using firefox.  Maybe Microsoft Edge works better?

## A way to plot without unit labeling errors and...

by: Maple 2023

Plots of physical quantities has significantly improved with Maple 2022. The updated useunits option makes unit conversion errors in plots very unlikely. A lot of time is saved when creating plots of physical quantities where values and units must be correct.

One final source of user errors remains: The manual entry of incorrect units in labels.

Below is a way to avoid such errors by computing labels with units for three prevalent axis labeling schemes.

Other desireable labels are given as a suggestion for future plot label enhancements where plot commands could provide formating functionality.

The rendering on this website adds double brakets âŸ¦ âŸ§ wherever units are used. You have to open the document to see how Maple renders.

Simple plot example: Solar irradiance in space

 (1)

 (2)

This plot has inconsistent axis labeling:

 • The vertical axis has units but no name
 • The horizontal axis has a name and units but they are not easily distinguishable. Misinterpretation is possible. Due to the close spacing the label could be read as a product of the dimension "time squared" (the time t times hours h is of the dimension time squared). Or the reader confounds name and units. (The use of italic fonts for names and roman fonts for units might not be noticeable and is a convention that is not used everywhere.)

The above labeling should be improved for communication, documentation or publication purposes.

A quick attempt using strings and the options useuints and labels.

Axes are now consistent and can be interpreted unambiguously. Formatting can still be improved.

Unfortunately, using the options useunits (for unit conversion) and labels this way introduces a new source of user error when labels are entered with the wrong units.

A way to address this and to ensure unit error-free plotting of expressions of physical quantities is the following:

Step1: Define two lists, one for the units to display and the other for the names to display

 (3)

Step2: Compute labels from the lists

This step avoids the labeling error: No manual entry of units in labels required.

 (4)

Dimensionless labels

Double brackets

Parenthesis