I'm using the LinearAlgebra package and the Matrix() command to build matrices in Maple 9.5. I need to be able to find the number of rows and the number of columns of a certain matrix A. I ran into problems running nops(A[1,1..-1]) and discovered that if I find the operands of a 3x2 matrix "wem" I am returned this: 3, 2, {(1, 1) = 0.7, (1, 2) = 0.1, (2, 1) = 0.2, (2, 2) = 0.3, (3, 1) = 0.1, (3, 2) = 0.6}, datatype = anything, storage = rectangular, order = Fortran_order, shape = []

Hi

Can anyone help me out.
I have created a procedure to produce the determinant of a  vandermonde matrix.
Now I have to prove the following

    Det(V) = product(xi-xj)   (excuse formatting)

I have been scratching my head & swearing like a trooper. I need help!!

Hello,

I am wondering if this is possible. I have a system of ODE that I want to solve numerically, let say they should give me x(t) and y(t) (two first-order ODE). But instead of specifying the initial condition as initial value: y(0) = a, x(0) = b, I want to specify the end value, e.g: x(10) = a, y(10) = b and let dsolve/numeric integrate backward from t=10 to t=1. Is it possible ? how do I do that ?

 

Thanks.

 

Hi,

I want to be able to identify terms in a multinomial expansion.

For example in (x+y+z)^3 i want to say that     x^2 y = x^2 z = y^2 x    etc.

Can anyone tell me how to do this?

Thanks

Jenny
 

For example I input:

 a := 1;
 b := 2;
 c := a+b;

then I press "cntr+=", and Maple gives me the answer:

 c := a+b=3

Is it possible to make maple show calculation steps, not only the result?

 c := a+b=1+2=3

Hello Colleagues, I attached a maple worksheet. 
View 9494_Graph_Components.mw on MapleNet or
 Download 9494_Graph_Components.mw
View file details

In which I have the following concerns:

Ok, here is what I tried to do:

restart;
with(Statistics):

X3 := RandomVariable(Binomial(n, p)):

k3 := n*(phi+ln(-1/(-exp(phi)+exp(phi)*p-p)))/phi;

j3:=algsubs(sqrt(Variance(X3))=sigma,k3);

 

When I do this, I receive an error message: "Error, (in algsubs) no variables appearing rationally in pattern".

I'm looking for a simple method of finding the maximum of a continuous function on a specific interval. I've thought about just checking endpoints and critical points on the interval... or discretizing the function on the interval in an array and doing it numerically... Or is there a quicker method I'm missing perhaps? The application is: I've got a complex rational function in the Laplace domain corresponding to an analog filter and I need a way of knowing the 3dB frequency, and to do that I need the max.

THese are the critical points:

 

(x,y) = (0,0)

(x,y) = (+/- sqrt (r) , r^2)

 

How do I plot this for various values of r >=1?

i cannot understand why the software is giving me such a stupid error???

can anybody please help!

I am solving a set of differential equations using the following command, numericalsol:=dsolve({ODEsys, ics}, numeric, method=rkf45) and I'm plotting my numerical solution using the following command, plots[odeplot](numericalsol,[t,w[1](t)],0..20); But when the solution is plotted the graph looks jagged and not smooth at all. I'm assuming that I am not getting enough points in my numerical solution and that's whats causing the problem. Is there any way to get more points so that my plot will look smooth?

Hi everyone.

In 1-D input and in the Maple calculator x^y^z is treated as ambiguous requiring brackets while in 2-D input it is mysteriously (to me anyway) evaluated as x^(y^z).

What part of my elementary education am I missing here which instructs me to treat  x^y^z as (x^y)^z or so I had always thought?

Seriously I'd appreciate an expert explanation.

Hi everybody out there! Here is a perhaps a newbe question! Is it possible in MapleSim to save a plot of, say x(t) with respect to t, as a table of values in a file? Let's say I have a 2D plot of x(t) with respect to t, and I want to save the table of values (t,x(t)) in a file where t ranges in t1, t2, ..., tn. Such a file is supposed to be used by external applications. Is this possible in MapleSim? Thanks for your hints. Sette

I have a set of datapoints, how do I match them to a curve and obtain intercepts and extrema? Ryan

How would I plot the direction field of y'=sin(y),   (pi,2) 

Im really new to maplesoft.