This blog will contain postings documenting some of my mathematical travels. In particular it will chronicle my experiences and problems in learning maple and the mathematics I am studying along the way.

I'm very new to maple and I've been experiencing a few difficulties. One in particular is quite frustrating: when opening a worksheet in classic worksheet mode I get a message that it was created in an earlier version, and after clicking OK maple crashes. For example, with the document here: http://www.maplesoft.com/applications/view.aspx?SID=1404 I am using Maple 12. This problem does not occur in standard gui mode, only classic worksheet mode but for a variety of reasons I wish to use classic as much as possible. Thanks

Hi all Given the relation, x sin(xy)=x , and wishing to find dy/dx by implicit differentiation, the easiest and most obvious way is to cancel x and then arrive at the answer dy/dx = -y/x: > implicitdiff(sin(x*y)=1,y,x); - y/x (assuming x is not equal to 0 of course) But, what if we try this: > implicitdiff(x*sin(x*y)=x,y,x); sin(x y) + x cos(x y) y - 1 - ------------------------------- x^2 cos(x y)

(1 2) (23)=(1 2 3;2 1 3) (1 2 3;1 3 2)=(1 2 3;3 1 2)

how to calculate this ?

 

Hi,

How can we do sth like the below example:

L:=[1,2,3,2,4,6,5,0,9,0,3,4,4];
number of elements greater than 1 and smaller than or equal to 3

ans=4

for example

VerticalBar∣ VerticalLine

∈ this can be got by "in",and "Element" with Command Completion

I don't know why they are the same,but both appear in the same pallete or different pallete.

I would like to know if it possible in Maple 12 to efficiently compute recursive procedures with two variables.

A simple example would be: f(a,0):=1 for all a>=0, f(0,b):=1 for all b >=0 and f(a,b) :=f(a-1,b) + f(a,b-1) for

a>0, b>0 (which defines the binomial coefficients). In trying to do this in a straightforward way i get

the error message "too many levels of recursion". Using 'trace' I see that Maple doesn't seem to be

creating a remember table for functions of two variables. Am I missing something?

If you highlight words that are above or below one another on an adjacent line, the highlighting does not highlight properly. 

 Can any one help me?  please see the attached maple file.

ThxDownload 10597_aa.mws
View file details

 

 

I have a system of 14 dae that I solve using method=mebdfi but when it comes to extracting numerical values and plotting my solution I get stuck.

The error I get is Error, (in unknown) unable to integrate past 0.36509631e-3: convergence could not be achieved with stepsize at minimum

Hello,

I'm looking for a simple way of building a matrix W whose columns will be column vectors w[1], w[2],...w[h] where h=1..r. I want to be able to incorporate this into a procedure in which h might be varied (otherwise I would just build a matrix e.g. <w[1] | w[2] | w[3]> manually).

Thanks

Magdalena

I input

w := proc (x, theta, t) options operator, arrow; sin(m*Pi*x/L)*cos(n*theta)*exp(I*omega*t-I*g*x) end proc;l[1] := (D[`$`(1, 2)](w))(1, (1/3)*Pi, 2)+(1-sigma)*(D[`$`(2, 2)](w))(1, (1/3)*Pi, 2)/(2*R^2)-K*rho[C]*h*(D[`$`(3, 2)](w))(1, (1/3)*Pi, 2); L[1] := simplify(l[1]/exp((2*I)*omega-(1.326880917*10^14*I)*gg*kk))

and it shows

Hello,

Happy New Year!

My problem:

I don't know why algsubs fails in the following case:

restart;
Xw:=2*Pi^2*(sin(w)*cos(5*w)+sin(4*w))/(w*(Pi-2*w)*(2*w+Pi));
algsubs(w=2*Pi*f,Xw);# problem in the denominator. w is not substituted.
subs(w=2*Pi*f,Xw);# subs works correctly
 

(I have Maple 13)

 

Hello,

Is there any function that deals with business days in Maple (sth like workday function in Excel)

The format of worday function in excel is: workday(start date, days, holidays). In fact it yealds the targets date with given start date and business days and possible holidays in that range.

For example,5 pictures,how to rename  the five picture use particular names,name1,name2,name3,name4,name5

name1~name5,are different words,

name1=alpha,name2=hello,name3=list,...

the names are in the the text,like this form:

+cognizant
#
$
+coagent
#
+rendering
#
+vaccine

 

of course this is more simple:

cognizant

coagent

vaccine

and other form with some identification codes

rename the picture file with the name in the .txt file.