Hi

I have a system of 33 equations in 33 unknowns. I figured I could use Linear Algebra and Maple to solve this system. Now nearly 9 hours later Maple is still 'Evaluating'. It's been many years since I studied Mathematics and I am very rusty since I rarely use what I learned directly in my job.

Also this is my first attempt at using Maple so please be gentle if you see a ridiculously stupid mistake :-)

Hey,

I am trying to plot 3d graphs but I get the following error message written in blue:

Warning, unable to evaluate the function to numeric values in the region; see the plotting command's help page to ensure the calling sequence is correct.

The function im trying to plot is:

f(x,y)=[ xy (x²-y² ] / (x² + y²)=expr

This is what I write in Maple:

plot3d( expr,x=-1..1, y=-1..1)

In advance, thanks.

Emile

I have a number of expressions.  An example is:

-1/3*(xjm1^2-2*xj*xjm1+xj^2+3)/(xjm1-xj)

I would like to substitue the expression h=xj-xjm1, which in this case would result in

1/h+2*h/6.

Does anyone know how I can make this sort of substitution in Maple automatically?

Hello,

Hopefully, anyone can help me with the following problem:

I have two functions:  Inta=f(Pa) and ETa=f(Pna). Both can not be solved analytically, but I can plot them separately when I use >plot (evalf(Inta), Pa=0..100) and >plot(evalf(ETa), Pna=0..100). So far no problem.

Furthermore, Pna can be described as >Pna:=Pa-Inta, so in fact ETa=f(Pa). But I fail to plot ETa against Pa (or at least it takes ages..since it keeps 'evaluating'..... for days) . I tried several things like:

Hello

When I export maple files into html files (with gif images), I often get jibberish text after "a>b". Maybe it's rendered as a html tag or something, I don't know.

Hiya,
I have an implicit equation;

> tan(beta)=-2/alpha*(beta);

where,

> beta:= sqrt(lambda*alpha-(alpha/2)^2);

for some dimensionless variable alpha.
I want to solve the equation for lamba and plot it as a function of beta.... but I don't know how to go about it.

Thanks for your help
k

So I have read (correctly?) that I can create an object with maple?

How do I go about that?  Just a push in the right direction, im not looking to do anything crazy at this moment, just an object with an array of numbers, some variables also with meaningful information.

Am I headed in the right direction investigating modules?

Thanks!

Hi all,

How do I set the worksheet font in initialization file? Thank you all!

hi,

i've a mathe exercise with the taylor series that i did on paper. i use maple to solve my tasks but now i have a situation where i am sure that i am not wrong but maple tells me something other

my function

f(x) = sqrt(x-1)

x_o = 5

i derivated the function tree times

f'(x) = (1/2)(x-1)^(-1/2)

f''(x) = -(1/4)(x-1)^(-3/2)

f'''(x) = (3/8)(x-1)^(-5/2)

for my x_o
f(5) = 2

f'(5) = 0.25

f''(5)=-0.03125

f'''(5) = 0.011171875

Hello everyone

I have a small, yet tricky question and hope someone knows a quick answer.

A calculation gives me a vector of say 10 complex numbers (floats). I want to store the amplitudes ( abs() ) and the phases ( argument() ) of these complex values in two seperate lists. Next, I want to sort the complex numbers by ascending amplitude, but I do not want to lose the phase belonging to each amplitude, for example:

I am writing a small procedure to help out some friends in a Diff EQ class and I want to print out little notes (their prof is letting them use maple on the test).  In other languages if I wanted to print something plaintext I could usually enclose them in quotation or tickmarks, or I would precede them by a backslash.

I am trying to say "implies F is equal to [crazy long function]" and I would like to use that cool little implies sign that maple has but whenever I do that I get a weird error message

The attached worksheet uses several procedures to develop a solution which is presented as a parametric plot of two procedures ("alpha" and "strain").  The current solution uses some constants declared at the beginning of the file which I would like to vary and then generate multiple plots associated with the different constants. 

I use Maple primarily in a Unix text window (TTY or "command-line" Maple), so I am used to seeing common subexpression labeling in the output of my computations. However, in Maple 11, GUI users don't see subexpression labeling by default.  I'll begin by talking about subexpression labeling as it appears in TTY Maple, then I'll talk about it in the GUI.

For starters lets look at an example in which a single subexpression is labeled:

I obtained the following result

> dsolve({diff(y(x), x, x)+e^x*(diff(y(x), x))+(1+x^2)*y(x) = 0, y(0) = 1, (D(y))(0) = 0}, y(x), series);
 
y(x) = 1-(1/2)*x^2+(1/6)*x^3+((1/12)*ln(e)-1/12)*x^4+O(x^5));

A procedure named curve(x) in the attached worksheet solves several equations, each dependent on the solution to the previous equation.  The problem is that when I issue the plot command for a range of the dependent variable x, the equation result that gets plotted is not for the result of the solution to the last equation for P.  Specifically, I would like to issue the "plot(curve,0.0..0.5, <other format commands>);" and get a plot of k vs. P.  Currently the plot is of k vs. P_bar.  Your comments are appreciated.