Hello everyone, I wonder how to carry out the so-called total derivative over a certain function with retaining the differential symbol "d". For example y=r*sin(theta) then how to obtain the following result from maple dy=r*cos(theta)d(theta)+sin(theta)dr. Thank you.

Hello there I'm a newbie, both here and to Maple !

I am performing arithmetic operations with polynomials. Can I get a step by step solution with such operations?

 

how can i found the integer number after any divident using maple commands

like

(13/4)

 

Hi

The following is a section of my codes:

Hi, 

Say if i have the following how can I label the contours with the value of f that each of the isovalue contour represent?

For example I tried:

L:=[a,b,c];
for i in L do
i:=Array(1..16):
end do:
 

I wanted to create three Arrays a, b and c.

I have an Array A with 90 rows and 16 columns.

The first column of each row denotes the name of a card, while the other 15 colums of each row specify certain characteristics of that card.

Moreover I defined a couple of selection rules Ri, to define sublists of A, which contain only the entries of the first column of A and where the number of elements in Ri is known a priori.

E.g.
R1:=[0$14]:
q:=1:
for i to 90 do
if A[i,2]=4 or A[i,2]=0 then
R1[q]:=A[i,1]:
q:=q+1:
end if:
end do:

Hi folks,

I'm using Maple14 (Build ID 479326).

It's unable to solve the folwing

fsolve({(1.+x[1])*exp(x[1]) = 7.505833908*10^26, (1.+x[2])*exp(x[2]) = 3.000809640*10^12}, {x[1], x[2]});            (1)

while the following is OK!

Hi, is there in Maple a generic identity matrix, i.e. with (symbolic) identity matrix behavior? I need it in order to perform some symbolic matrix computations, for example: (I-A).(I+A+A^2+...) Thanks,

View 16984_Model.mw on MapleNet or Download 16984_Model.mw
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Hi, Question 1: Is it possible to have names using subscripts? I've tried a few names with subscripts. Sometimes it works, sometimes it doesn't. Question2: There must be a faster way to write greek letters using the keyboard instead of going to the greek palette and clicking the greek letter you want. I wasn't able to find how to do that yet.

I want to implement from the following,

> A := `<|>`(`<,>`(6, 2, 1, 6, 8, 3), `<,>`(4, 3, 7, 1, 7, 2), `<,>`(3, 7, 2, 4, 3, 9));

> b := `<,>`(55, 37, 40, 33, 60, 75);

the procedure:

A x X = B
X = A x BA = U x S x V (Singular value decomposition of A)
A = V x S x U(Generalized inverse or pseudoinverse of A)
X = V x Sx Ux B

Least square fit solution
x = 2.63293929474354
y = 3.66652382290048

I'm just learning ODEs and have a textbook problem I'm trying to plot in Maple 13. For the ODEs, In the first year I have a certain behaviour (contaminated water flows into a pool) and in subsequent years fresh water enters the pool. I'd like to show both behaviours on the same plot. How would you do this? Here is what I did to make two separate plots: In the first year - I have contaminatation of a pool: ode1 := diff(q(t), t) = 3-3*q(t)/10^4 DEplot(ode1, q(t), t = 0 .. 8760, [q(0) = 0], title = "contaminant accumulation in the first year")

I want to show which parts of a sequence of plots were obtained later.

The program, written with a huge help from Mapleprimes forums (thanks!) draws some (for example, 200 but it varies) small plots and then paints all of them on one picture. It would be more clear if one could see what happened first. I am thinking of different colours for consequtive plots but not sure that know how to use them well.

If it may be important, the program is below. I would appreciate any help.

 

printlevel := 4;

iter := 200;

"User-selection of