Hi all, I have recently started playing around with Maple after using Mathematica for years. I am trying to understand how to do pattern matching in Maple, and am being frustrated by the following example using indices:

patmatch(S[a],S[b::symbol])

I would expect this to evaluate to true when none of the symbols have been given other meanings, but this isn't the case. For the life of my I can't work out what I'm doing wrong, and have been unable to find an example of pattern matching with indices online. What am I missing here?

The equivalent statement using functions:

patmatch(S(a),S(b::symbol))

returns true as expected.

Many thanks in advance!

I have a student who has a problem when closing and opening a Maple file.

It seems as if Maple turns math fields into text, but still execute when using ! or !!!

The dark red part is written in a text field, but Maple still executes

If I try to write in a math field and executes, closes Maple and opens again, this does not happen, so it is not the file that is the problem.  The student is running 2024.2 version.

Can anyone explain the problem and how to solve it.

I am unable to add a comment or the file. I have tried several times, without any luck

Update 

Also, is there a way to disable the use of remember tables permanently in Maple? This causes me so much trouble and It is cause of why Maple behave differently at different times.

Help shows how to do it if one knows the name of the module or procedure. But Maple has 1000's of these. There does not seem to be a way to tell maple

          forget(all)

and have set once. (may be something I can put in the ini file, to disable this feature).

At the end of help it says

"As a special case, specifying f as an empty range allows for selective clearing of remember table entries from all remember tables in the system.  This requires a second argument, to indicate which entries to clear. For example, forget(..,x), which will clear all remembered entries in the system that reference x.  "

But what is x in the above?? If I do forget(..) it does not work.

---- end update ------------------------------------------------------------------------------------------------------------------

Adding printlevel:=20, I see simplify generate/runs through longer code the first time. The second time calling the same exact simplify code, now it shows it runs through much shorter code. 

I am assuming printlevel is behaving correctly each time.

This must be due to cache simplifies keeps somewhere, or some internal settings it updates from first time and this is what causes it to do shorter run second time.

Without doing restart, how can make force simplify to run through same code it did the first time and each time? i.e. as if it was called the very first time each time?

I tried forget, but it is not doing anything.

Here is worksheet.  The code is simply this

printlevel:=0;
restart;
printlevel:=20;
simplify(3*x^3/x+sin(x^2)/4);  #long printout

simplify(3*x^3/x+sin(x^2)/4);  #short printout

printlevel:=0;
forget(simplify,forgetpermanent = true,reinitialize=true);

printlevel:=20;
simplify(3*x^3/x+sin(x^2)/4); #still same short printout

So there is something else needs to be cleared? Only way to get the long printout is to do restart. but ofcourse I can't do restart in middle of a loop.

I tried gc() also, but had no effect. 

What other commands are there to do this? I do use Physics and it is on my libname.

Download how_to_clear_simplify_cache_march_24_2025.mw

Anyone has Maple 2025 could check if same behaviour there also?

How to I generate and or export a plot without a white border or equivalently , just  the information inside the axes?

See example. Note that when I insert the content below, it fails to accurately copy the information( blue background). If you look at the attached maple file, it should be very clear what I'm after.

kill_plot_border_on_plot_generation_or_export.mw

Download kill_plot_border_on_plot_generation_or_export.mw

Using the attached problem, I want to calculate a term with a constraint that m is not equal to n. How do I insert general constraints into Maple?

test.mw

Hi,

I'm working on formatting my tables for export to PDF. Is there a way to align the text in the cells (to the left, for example)?

Thanks

GenerateSimilar_Ala.mw

I do not understand why select(has,-a^2,x); returns 1 but select(has,a^2,x); returned undefined.

Should not both return undefined, since there is no x anywhere in the expression?

I looked at help and do not see a clue so far.

Download select_question_march_23_2025.mw

Here is another variation, where I changed a^2 to a

Download select_question_v2_march_23_2025.mw

The good thing is that has(C,x) returns false in both case. So the problem is not with the has call. It is select which decided to return 1 when there is negative sign. But why?

Download select_question_v3_march_23_2025.mw

a lot of time i have this issue when i want delete something it take a lot time to show the in this worksheet it happen too what is issue it is becuase all the text are not in text modde or what? and when i want copy and past my function to place with text is write null for me, what is problem?
and why in end of my display there is two graph?

2-line-label-done.mw

Trying to use plot to connect a series of points for illustrative purposes, but the functionality seems to have broken in 2024 or else I'm overlooking something. Related/unrelated: When I copy the related code from the cell and paste it into another application (like a browser) the list of points is reversed: e.g. `

plot({[-1, -2], [-1, 1], [-1, 6], [3, -2], [3, 6]}, x = -3 .. 4, y = -4 .. 10, style = line)` 

(That was literally me copy and pasting the relevant code from Maple into this form.)

The plot in question can be seen below. Also to note, if I leave off the last [3,-2] point, it will correctly plot the graph. It's ony when I add in that last point that I suddenly get the shape I do below. 

In 1-D Math, subscripts can be found with crtl-F

In 2-D Math this does not work. 

Also powers of (^) cannot be searched in 2D-Math.

Are there any ways to perfom searches on subscripts or superscripts in 2-D Math?

i did plot without reducing the decimal but when i reduce to 2 decimal this error is showing up How i fix this issue?
plot.mw

Looking back at this question:

https://www.mapleprimes.com/questions/37691-How-Do-I-Change-The-Background-Colour

the reply by Hmm in 2009

"In Linux there is an X11 resource file for the classic worksheet, one of the settings controls the background color.  The distributed file is located in the maple/X11_defaults directory."

suggested a solution only thiis does not work for me in Maple2024. Perhaps because this worked for the classic view.

Why is there still no way to do this after 16 years or perhaps I just cannot find the option?

Is there away to change the background colour or even invert all colours?

I occasionally find myself inexplicably in a region of my worksheet that does not respond to my editing, fe.g., I cannot erae or I cannot copy. I recently typed a command-there was an error of some form and I tried unsuccessfully to edit it. Then I tried to copy the code and enter it at a prompt. It refused to enter it at the prompt but copied it below the prompt in a strnge region that I do not understand. When I retyped the command at a prompt it worked fine. I do not understand th dead regions that pop up mysteriously. (I am using Maple 2024 on a Mac) The page is too long to copy but I could upload it if given directions.

in this equation we have a list of a lot paramter which i have to find it but in prgress to find it some issue are appear i don't know how many term i have to replacing by algsubs there is any way for showing that something like lpring just for factoring and replacing if we did something like that in one step we can replacing all and then find our parameter there is any way for finding parameter like that?

Download pro.mw