itsme

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13 years, 32 days

MaplePrimes Activity


These are replies submitted by itsme

@acer 

ok i think the problem may be that my 2016.0 version is not what you have:

Maple 2016.0, X86 64 LINUX, Dec 13 2015, Build ID 1096153

the build seems older than what you have (maybe this is the lats RC from the beta?). Either way i'll try to get my hand on the same one you have.

 

thanks again.

@acer 

thanks for looking into this.

First i should note that I do run maple 2016.1 (not 'a' perhaps) on two different machines, but both are on ubuntu 14.04.  No problems on those computers.

This is a new machine with a fresh install of ubuntu 16.04.

These are the installation and upgrade files that I have been using, which (at least for the upgrade) seem consitent with what you have (i will look at the Build ID of a non-patched version later tonight):

md5sum ./Maple2016.0LinuxX64Installer.run
06455f61d8d822ad39d1242cfae85de2  ./Maple2016.0LinuxX64Installer.run


md5sum ./Maple2016.1LinuxX64Upgrade.run
7502caaa65cc623d5d2574823eee9343  ./Maple2016.1LinuxX64Upgrade.run

I guess i will contact support.

thanks

 

@ecterrab 

Thanks a lot for taking the time to answer this question Edgardo.

Looking at your modified worksheet however, I see that after the call to Library:-SortProducts, which results in Eq. 8, the products are not in fact written in the "correct" order. For example look at the 2nd and 4th terms in the second-last line. We still have terms like:

Dagger(a) a Dagger(a)

etc...
which clearly are not in normal order. There are other terms containing operators b which are also not in normal order (look at line 2 of Eq. 8).

The same follows after the simplification in Eq. 10 (see lines 4 or 5).

So my question still holds in a sense, if I'm just missing something, or at this stage it's not possible to write this expression in the normal order automatically (i.e using SortProducts or equivalent)?

... and thanks for all your work on the physics package!

 

i guess i understand "interface issue (2)" from above - maple gets "stuck" because after the execution block, i copy-pasted part of the equation into text, but that equation is considers 2d math input by maple...  and i guess it can't "jump over it". Fair enough.

 

thanks for posting this!... very nice, and could be very useful.

@Kitonum 

did you submit this? certainly seems like inconsistent behavior

@Carl Love 

Thanks Carl - somehow didn't come across this before... 

@ecterrab 

 

just a word of caution... in some cases one will get a wrong (unexpected?) result. For example, consider

with(Physics):
Setup(operator = {A})

f:=exp(A(t));

diff(f,t); #wrong answer in general - assumes [A(t), diff(A(t),t)]=0, but does not have to be true.

it's easy to see that this is also in general wrong:

restart:

with(Physics):
Setup(operator = {A, B})

f:=exp(A(t) + B(t));

diff(f,t);  #wrong

Thanks for looking into this in detail @epostma 

As a side note...  It would be nice to make the source code of maple modules browsable, as that would make it easier for users to understand what it is that they actually doing/using. 

 

thanks for taking the time to post this info @epostma !

It helps very much indeed!... it could also be a good idea to mention this information in the help section. 

 

 

bump...

mr/ms maple developer - i'm sure you're out there...  ;)

@acer 

thanks Acer. Hopefully the devs can shed some light on this. 

@Mac Dude 

you can run vnc over ssh.

also... nomachine nxserver/client... again runs over ssh. 

@Prashanth 

regarding the maplet issue - i have not used maplets other than trying simple things in the past which lead to problems. It could be settings related but I doubt that, if you're seeing a problem with the simplest of plots. Submitting SCRs is alwas a good idea. 

However, more generally, trying to plot from the command line to a file is pretty broken as well. Some plots work (as in a curve is visible), but if you want any customization (font size change, etc) you'll likely have issues. Also the plots will not have things like antialiasing and are ok, for say a quick look, but IMO are not really presentable. 

Your milage may vary in all of this... so you might still want to try things out for yourself. I spent a lot of time trying to get things to work, as I had aceess to a gui-less many cpu-cluster, and watned to generate many plots in a batch mode - it was a rather painful experience, and i eventually gave up.

@Prashanth 

i see. You're probably out of luck then, the plotting from the command line has been neglected for years. 

Again, depending on what kind of "interactive features" you need, some other packages might be useful - matplotlib (with a toolkit) allows for interactive rotation/zoom in 3d plots. 

alternativey, since you're writing in java, another option could be to generate your data using maple, then plot using a native java library. 

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