Dear Forum,

I get data from a mass-spectrometer and want to do some analysis on it . 

What I get looks like this : ( only a few lines, the files are very large )

t[s]; scanId; m/z; I[A]; pTot[mbar]
2.00;0;0; 0.000000e+000; 0.000000e+000
4.00;0;0; 0.000000e+000; 0.000000e+000
441.00;0;0; 0.000000e+000;1,29E+00
443.00;0;0; 0.000000e+000;1,29E+00
453.00;0;0; 0.000000e+000;1,26E+00
455.00;0;0; 0.000000e+000;1,24E+00
463.00;1; 0.390625;8,14E-05;1,23E+00
464.00;1; 0.40625;1,23E-04;1,43E+00
464.00;1; 0.421875;1,73E-04;1,43E+00
464.00;1; 0.4375;2,27E-04;1,43E+00
464.00;1; 0.453125;2,77E-04;1,43E+00

When I add some blanks, it looks like this :  

t[s];        scanId;   m/z;              I[A];               pTot[mbar]

464.00;  1;           0.421875;     1,73E-04;     1,43E+00

The columns are separated by semicolon

t[s]  and m/z are separated with a dot,  I[A]  and p come as exponentials with a comma.

When I try to import this  with

 BKK := Import("H:\\Maple\\Spielwiese\\BGSample.csv")

I get a DataFrame with two columns -correct-  because there are two commas. 

Is there a way to import such data without preprocessing into maple ?

I include the data file, had to change the suffix to .txt - the original is .csv

Thank you and kind regards, 

Klaus

Download howdoiimportthis.mw

I often want to export an expression from Maple to LaTeX. Often, the output will contain commands that my LaTeX compiler doesn't recongnize. This hinders my LaTeX document production efficiency greatly. I use MiKTeX and Texmaker to generate documents in LaTeX language. Naively I assumed that Maple sticks to core LaTeX packages when generating an output. I still don't know if that is the case. The main issue is that, I don't know which LaTeX packages some of the Maple outputs use, and so, I don't know which packages to load in my LaTeX document.

As a concrete example, I show how I convert an expression to LaTeX language and how that particular output contains commands: \iup and \idn which are not recongnized by my LaTeX compiler since I don't know which package these commands come from. I google search for commands \iup and \idn came up empty. How do I figure out what package these commands come from

Latex_export_problems_1.mw

Hello,

I have been trying to figure this out for a long time and can't find anyone else having the same problem.

I use the built-in unit system for assigned values (short-cut is Ctrl+Shift+u) a lot when doing electronics calculations and electromagnetism, so I often use resistances and therefore need to use Ohm. This is very often an option in the "Choose Unit" drop-down menu on the right, but when too many units are brought into the same calculation the option dissappear. Usually I the go to the "Enter Unit" menu as to write the unit out myself I cannot figure out a way for it to accept greek letters. Does anyone know what to do?

I am a little not clear why Maple's odeadvisor gives [_2nd_order, _reducible, _mu_xy] as an ode type for a second order ode which is already exact as is.

When the ode is exact, then no integrating factor mu is needed (or rather mu=1). But Maple says the ode is "reducible" using an integrating factor mu(x,y)

restart;
ode:=x*diff(diff(y(x),x),x)+(y(x)-1)*diff(y(x),x)=0;
DEtools:-intfactor(ode);
DEtools:-odeadvisor(ode)

THis ode is Kamke's 6.78, it is alslo mentioned in this paper in table 1 at page 18

I am just little confused, about the terminology. I thought reducible means the ode reguire an integrating factor of the form mu(x,y) or my(x,y') or mu(y,y') when it is not exact in order to make it to an exact ode so it can be now solved.

Why would odeavisor then says an ode which is already exact is also reducible using mu(x,y)?

 How to rectify the Error, (in MTM:-findsym) invalid input: a string/name list is expected for sort method `lexorder`   .Could you please help me to plot the curve.

TC1.mw

Are Maple settings responsible for this error:

My worksheet carries out some preliminary checks and if these fail I want to prevent or cancel any further executuon of the worksheet.  Something like (pseodo-code)

llContinue = DoThePreliminaryChecks()
If Not llContinue
    Cancel/Return/?
EndIf

I couldn't find anything in the docs or with Google.  Any suggestions?  Thanks.

Mathematica's Dimensions returns a list of the allowed levels, which has been implemented in Maple as . But 

MmaTranslator:-Mma:-Dimensions(<<1 | 2>, <1 | 0>>);

returns [6], and 

MmaTranslator:-Mma:-Dimensions([[1, 2], [1, 0]]);

returns [2, 2, 4]. What happened here?

It should be [2, 2].

Download Mma[Dimensions].mws

I have a vector (matrix) that looks like this. I want to save it to txt text. But the Export function doesn't seem to do that.

M:=Vector[column](10, [{{a, b}, {b, c}}, {{d, e}, {e, f}},
{{d, f}, {e, f}}, {{a, h}, {h, i}}, {{a, i}, {h, i}},
{{d, e}, {d, f}}, {{a, h}, {a, i}},{{c, d}}, {{a, b}, {a, c}}, {{a, c}, {b, c}}]);
Export(M,"E:\\M.txt");

Error, (in Export) invalid input: Export expects its 1st argument, input, to be of type string when target=file, but received Vector(10, [{{a, b}, {b, c}},{{d, e}, {e, f}},{{d, f}, {e, f}},{{a, h}, {h, i}},{{a, i}, {h, i}},{{d, e}, {d, f}},{{a, h}, {a, i}},{{c, d}},{{a, b}, {a, c}},{{a, c}, {b, c}}])
 

I found that I can save it in xsl format.

with(ExcelTools): Export(M, "E:\\M.xls");

How to save M in txt format below?

Hi Everyone,

I intend to find the invariants of a 2nd-order Tensor using the representation of the rotational group as an Infinitesimal generator. However, maple does not seem to find the correct invariants $\tr \mathbf{a}$, $\tr \mathbf{a}^2$, $\tr \mathbf{a}^3$. Maple only returns an empty set. I can't seem to figure out why that is the case.

Here is my code

Download SO(3)_spherical_2.mw

Any input would be appreciated!

Hello there,

Is the price of 295 USD for unlimited use in time?

Kind regards,

Eduardo

Hello guys,
Can anyone recommend good books on advanced programming and other Maple topics? The books I have only have the basics.
Regards,
Oliveira

Execute the following codes in Maple input (1-D math) in the Standard interface. 

(cat("A".."C"),cat("d".."f"))||'$"G".."I",$"j".."l"'; 

Then an error occurred. But if one copy them into 2-D math (instead of Convert To>2-D Math Input) and execute them directly, everything goes without any error messages.

It says that mixed 1-D and 2-D math inside one command is not supported and not recommended stylistically. However, I just want to understand the reason why an error is raised here. 

Download unexpectedConcatenation.mws

Hello everyone,

I am having trouble with this a system of 12 differential equations with the respective 12 initial conditions. I try to usen dsolve with the "numeric" parameter but it stays "evaluating" forever. I tried a system of 10 equation and I got the correct answer, although the program stayed calculating for several minutes (more or less 5 minutes). Is the size of this system too much to handle for the program? 

This is the system of differential equations (sys) and the initial conditions (ics) that I am trying to solve:

maple_primes_question.mw

Download maple_primes_question.mw

What am I doing wrong? or is it that the program cannot handle such a large system? In that case, that would be dissappointing since I have to solve a similar system but with up to 22 differential equations and initial conditions so I am stuck...

Anyway, thank you very much for any guidance, and happy new year.

 A:= <x1,y1,z1>:  B:= <x2,y2,z2>:  P :=<x3, y3, z3>:  H:=A+t*(B-A):  solve( (P-H)^+ . (B-A), t ):  'H'=eval(H, t=`%` );

Error, invalid powe, rhow to overcome this mistake ? Thank you.
Typesetting:-mambiguous( AAssign (x1commay1commaz1)colon  BAssign 

  (x2commay2commaz2)colon  P Assign(x3comma y3comma z3)colon  H

  AssignA + tast(Buminus0A)colon  solveApplyFunction( 

  Typesetting:-mambiguous((Puminus0H)circ + , 

  Typesetting:-merror("invalid power")) period (Buminus0A)comma t

   )colon  (H)equalsevalApplyFunction(Hcomma tequals% )semi)