Thomas Richard

Mr. Thomas Richard

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12 years, 159 days
Maplesoft Europe GmbH
Technical professional in industry or government
Aachen, North Rhine-Westphalia, Germany

MaplePrimes Activity

These are replies submitted by Thomas Richard

Please upload your worksheet so that we can reproduce the problem. Use the green arrow-up button in the message editor.

Both packages are designed to be compatible, of course, so this is an unexpected error message that we would like to fix.

MTM is an auxiliary package for the Maple Toolbox for MATLAB, so it's not meant to replace VectorCalculus in any way.

@Andreas Greuer You mentioned Maple 2021.0; so could you please install the 2021.1 update from here and try again?

@nm Evaluating at x=0 is needed because that‘s where the IC is given.

If you just supply ode as the 2nd argument to odetest, it will return 0 as expected. So it‘s the list [ode,ic] that makes trouble here. Therefore, I suggested to help odetest in evaluating the IC.

@Preben Alsholm There are more errors, e.g. thata vs theta in the spoke procedure.

Hint to @Rouben Rostamian: maplemint(<your proc name>) will detect that.

Also, I would not use short form of package commands in procedures - better insert uses plots, plottools: in all of them.


@Rouben Rostamian  The problem seems to be the derivative in the integrand - that case is not covered by intsolve routines, so it is being rejected (with an incorrect error message, though).

@Mariusz Iwaniuk We are grateful for feature suggestions, but please understand that we cannot give a public commitment about implementing non-trivial features in a certain timeframe (or version).

@Rouben Rostamian  I'm afraid this won't help much, as fracdiff doesn't handle unspecified alpha either (which the OP requested). fracdiff is useful to compute the fractional derivative of a given function, though.

And Maple has the intsolve command, but it's limited to linear integral equations.

@Realeboha No, I said it's not possible to solve such equations using dsolve. There may be other techniques, but I'm not an expert, sorry.

@michalkvasnicka As far as I know, there is a problem with the toolchain that's generating the PDF. For now, please use the Programming Guide that's built into the product.

@markweitzman I agree that this particular one should be covered by default, but there will always be elegant approaches that a human just "sees" - which a computer (or an algorithm, more precisely) cannot do.

Could you please upload your worksheet so that we can reproduce the problem? Use the green arrow-up icon of the message editor.

In the screenshot, I see that you entered f and g directly, or perhaps copied & pasted from the evalc output. Better assign that output to some variable, say expr, and then call Re and Im, resp.:

expr := evalc(...);
f := Re(expr);
g := Im(expr);


@Thomas Dean I saw from the output (memory usage and timing) that you used command-line Maple, so I used that as well (Maple 2020.2 on a Ubuntu box). It reliably found the factors after a while - no crash.

Can't tell about the maplev-mode, though, as I'm not using Emacs.

@A_Ebrahimi I cannot make much sense of your reply. But I see that you opened another thread with the right command, namely Student:-Calculus1:-ShowSolution. That's okay.

But please do not post images of Maple code. Most people here (including me) will not type in anything from a screenshot. Upload your worksheet instead. That's very easy, using the green arrow button of the message editor.

@A_Ebrahimi Sorry, I don't understand your question...

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