MaplePrimes Questions

Hello every body

I have a plot that contains two curve. I need to chracterize the curves with `min(D_{T})` and `max(D_{E})`. Is it possible to write legend of plot such that when include it in latex file,  T and E be presented in indices?

i used this  commend to plot three equation and it actually work .my question her how to show any point cordinates just i pointed on it ? could i do it by maple or what ?
help please 
implicitplot3d({f[1], f[2], f[3]}, Q[h] = 0 .. 100, S[h] = 0 .. 100, R[h] = 0 .. 100);

when i evaluate this summation if Q[h],S[h],R[h] are big floating numbers it take along time how i decrease this time 
P := simplify(sum(sum((t+1)*Q[h]^2*(1-Q[h])^(t+T)/(t+1+(R[h]/S[h])^sigma*(T+1)), t = 0 .. infinity), T = 0 .. infinity))

The link below has my code for generating 2 matrices.  The 1st one does not generate flfoating point numerical data; whereas, the 2nd one does.  What is wrong with the 1st case?  I am attempting to single out one harmonic which works in the 2nd case.  Also, is there a way I can generate a spectrum of S2(k= 1 to 100, t= 0 to 1)?



evalf(int(GAMMA(s), s = 1-I*infinity .. 1+I*infinity)); # careful

There seems to be no way to terminate this computation. After clicking "Interrupt the current evaluation", the worksheet is still unresponsive, I cannot edit or copy the contents.

I can close the document, but even after I quit Maple, mserver.exe is still running and I have to terminate it manually.

This is in Maple 2017.2, system="X86 64 WINDOWS", wordsize=64.


int(1/(s^2+1), s = 1-I*infinity .. 1+I*infinity); # as expected

evalf(Int(1/(s^2+1), s = 1-I*infinity .. 1+I*infinity)); # Pi?

So evalf(Int(...)) either doesn't know how to handle complex infinite endpoints or handles them in a way incompatible with how int() does it.


Hello every body

I have three vectors `X`, `Y` and `Z`. I need to plot `X` vs `Z` and `Y` vs `Z` in one plot. How can I do this?

Thanks in advance


I have some matrix valued functions that that I can only define piecewise. Unfortunately I have some problems to manipulate those functions. Piecewise sees to do the job for  scalar valued functions. There I can easily differentiale and add results. For Matrix valued functions however, those features seem to not be availible.

I can work around these limitations by manually applying all operations to the operands of the piecewise function. Like I show here:



# a piecewise function


p1 := piecewise(a(t)^2 = 0, Vector(2, {(1) = cos(a(t))^2+sin(a(t))^2, (2) = 0}), Vector(2, {(1) = 1, (2) = 1/a(t)}))


# differentiation does not work


diff(piecewise(a(t)^2 = 0, Vector(2, {(1) = cos(a(t))^2+sin(a(t))^2, (2) = 0}), Vector(2, {(1) = 1, (2) = 1/a(t)})), t)


# selecting individual entries does not work


r := (piecewise(a(t)^2 = 0, Vector(2, {(1) = cos(a(t))^2+sin(a(t))^2, (2) = 0}), Vector(2, {(1) = 1, (2) = 1/a(t)})))(1)+1


# strange simplification behaviour


piecewise(t = RootOf(a(_Z)), _z1(RootOf(a(_Z))), Vector(2, {(1) = 1, (2) = 1/a(t)}))


# current workaround, define new piecewise function by using op


r := piecewise(a(t)^2 = 0, cos(a(t))^2+sin(a(t))^2+1, 2)






I think my workaround is very cumbersome and error prone. Is there a better way to tackle this probem? Or should I try to overload all needed operations, and is this even possible?

Thanks for all suggestions!


is it possible to express rational number into fraction in terms of power of 2





Hi, there.

I have a program, and I want to make an interface where I can text in the figures and show the results. But I have no idea about this. Anyone can give me some instructions? Thanks!


I'm importing some data from Excel which comes across as L:

L := Matrix(1, 6, [["TC,DB", "PC,JL", "TD,JK", "IW,CM", "CC,PG", "KJ,DJ"]])

M: = convert( L,'list' );

["TC,DB", "PC,JL", "TD,JK", "IW,CM", "CC,PG", "KJ,DJ"

map(convert, M, 'name') ; # remove inverted commas

[`TC,DB`, `PC,JL`, `TD,JK`, `IW,CM`, `CC,PG`, `KJ,DJ`]

How to I add square brackets to each pair in the output?

What I want is a command to display L or M as:

[[TC,DB], [PC,JL], [TD,JK], [IW,CM], [CC,PG], [KJ,DJ]]


tanh(1-x) = sum(p(ii)*x^q(ii), ii=0..infinity) or product(p*x^q(ii), ii=0..infinity) ?
tanh(1-x)*1/(1-x) = sum(p(ii)*x^q(ii), ii=0..infinity) or product(p*x^q(ii), ii=0..infinity) ?
tanh(x) = sum(p(ii)*x^q(ii), ii=0..infinity) or product(p*x^q(ii), ii=0..infinity) ?

Remark: it may not be possible to use diff to find p(ii)


series(tanh(1-x), x=0);
Coefficients(series(1/(1-x), x=0));
coeffs(series(tanh(1-x), x=0));
coeffs(series(tanh(1-x), x=0),x);
Error, invalid arguments to coeffs;
and is it possible to find q(ii) only if assume p(ii) all are one?

I am trying to solve a vector calculus problem, find r(t) given:

a(t) = < 4t, sin t, cos(2t) > ,  v(0) = <1,0,0>  , r(0) = <0, 1, 0 >

My approach below seems kind of complicated for such a straightforward problem.  I am trying to do this without copying pasting previous results. Also there might be a recursion issue when i defined v in terms of v(t).



I am a newbie at generating numeric data sets using the Matrix command.  Linked is the code I used to generate a time profile for various values of k.  The output results in 10 separate matrices for each value of k.  Instead I would like one matrix that has all ten data sets included.   Can anyone provide assistance?




   ,Hello friends

  .I want to plot a coupled differential equation numerically  but I dont know whats wrong with the loops



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