I am using Maple 15 and every time I try to plot this equation it doesnt seem to want to plot. This is the code I keep trying to input:

plot(3*e^(-x)*x-e^(-x)-1.5*e^(-x)*(x^2)+e^(-x)*(x^2)*log(x),x=0..9,y=-1..0.6);

Every time I get "Plotting Error, empty plot"

The equation came from the original differential equation .5(d^2y/dx^2)+(dy/dx)+.5y(x)=ln(x)e^(-x)

 Also When i try to plot this equation:

-.5*e^(-10*x)*sin(10*x)-.5*e^(-10*x)*cos(10*x)+(3/2)=300

Solve for x in the following expression.

log x=-4

Hi!

I just got a simple expression after a longer equation where the last number in the expression is very small, and should be se seen as zero.

E[A]+40,0*10^-9, and it should only say E[A]

Is there a simple command to "round away" 40*10^-9?

It has to be simple because it is written in a report.

Best Regards

 Nicolai

hi friends i have already asked help related to this code which am gona post but this time I am facing some different problem. In the worksheet which i attached below is having algorthim for cubic spline on heat equation. IN this sheet FD equation is my main equation and i want this equation to use boundary conditions mention in code. After using that i want this equation to generate system of linear equations when i=0..M, j=1..N. But i dont want to solve it completely. After...

I use the following commands to export a graph to a file:

plotsetup(gif, plotoutput=cat(filefolder,examplenr,".gif")):
print(display([pol],color=grey,scaling=constrained,axes=none,view=[0..100,0..100])):

filefolder is defined as a complete path: filefolder:="D:/TopUp/models/vergelijking/":
And pol is a pol:=plottools[polygon](polygonlist,color=grey): 

This works fine when I use it directly in a Maple worksheet.

However, if I save...

We want to fit

f(x) = a_0 + a_1 *x + a_2 * x^2 + ... + a_n * x^n

to the data (x_i,f(x_i)) for i = 0 ... n.

It will give rise to the following system

[ a_i ] = [A]^{-1} * [ f(x_i)].

Here [a_i] = [ a_1 a_2 a_3 ... a_n], 

[A] = [ 1 x_0 x_0^2 ... x_0^n ; 1 x_1 x_1^2 ... x_1^n ; 1 x_2 x_2^2 ... x_2^n ; ... ; 1 x_n x_n^2 ... x_n^n]

and 

[f(x_i)] = [f(x_0) f(x_1) f(x_2) ... f(x_n)].

I want to know how to take the fourier transform of a solution to an IVP obtained using dsolve/numeric and consequently plot the transform. any ideas?

Hi!

i'd be glad to get some help with that problem:

i want to do a plot3d of serveral functions depending on x1, x2.

My problem is the that I need it to be plotted on a triangular domain. i.e. the triangle limited by the edges (0,0), (0,1), (1,1).

I tried the following:

p[i]:= plot(phiX1[i](x1,x2),x1=x2..1-x2,x2=0.. 1);

and received:

Error, (in plot) expecting a real constant as range endpoint but received x2

I have an animated spacecurve with arrow:

restart:with(plots):

p4:=animate(arrow,[<cos(tend),sin(tend),0.9 tend>,<-cos(tend),-sin(tend),0>,color=red],tend=0..50,axes=boxed,frames=150);

I succeed in putting text at basis of arrow:

l3:=animate(textplot3d,[[cos(tend),sin(tend), 0.9 tend, 'basis'],color=black,align={BELOW},font=[TIMES,ROMAN,14]],tend=0..50,frames=150);

I like tot put text at the end of the arrow. This is my 'progress':

Hello evrybody,

my first question here.

i'm a engineer studend in electronic and i'm working on the inverted pendulum problem at my university.

so i need to use the lagrange way to get my equations in the good form.

i have this equations :

Hello,

I have a plot of a cylinder with points singled out.

Firstly, the points are currently given by (x,y,z) but I would like them in terms of (r,θ,z), how can I do this?

Secondly, I was wondering how to assign to each point an [i,j] value? So you could have r[i,j], θ[i,j] and z[i,j] as matrices of the points?

Points_on_the_initia.mw

Maple is saying 'Error, Vector index out of range'. Can you see how maple executes all steps, so I can see where exactly the problem is?

http://www.maplesoft.com/applications/view.aspx?SID=33040&view=html

it can calculate from numeric data, is it the end?

where do multiset coming from?

if given a multiset, and calculate its power sums, then i express this power sums in terms of symmetirc polynomials, what is the purpose of this?

I often have to create density plots with many (thousands of) points. Hence the first thing I do when I install a new version of maple on linux, is edit dir_of_maple/bin/maple so that

JAVAHEAP=512

is instead

JAVAHEAP=4096

I have done this for years and never have any memory problems. But recently I have sent my code to someone who runs Windows and they seem to have "out of memory" issues when trying to do density plots of large datasets.