## A symbolic intergration...

Hi, I am a green hand of Maple. I guess this is a common question for many users. Some times, Maple can not deal with an integral with a lot of symbols. However, if I manually simplify the integral somehow so that less simbols are left, keeping the main feature of the integral unchanged, it works. Thus, my question is: Is there some limitation that number of simbol can appear in the integral? What decides whether a integral works or not? Thank you.

## how i can solve this int with numeric methods?...

hi dear friends

i want to solve this int with numeric methods such that doesn't contain erf function

thanks alot

(my function is e1, and I want to calculate the int of e1)

## animation Student [LinearAlgebra], Student[VectorC...

With the idea developed by Robert Israel on the

## Simple Indexing Question...

I made a program that spits out and alpha and beta at the end of each procedure. What I need to do is assign each alpha and beta a unique name. IE, when it runs the procedure 1, I need it to name them alpha1 and beta1, then for proc2, alpha 2 and beta2. For as many times it needs to run through this process because it may go through proc1 more than once.

It seems I can't find the resource I need, just that one little tidbit in the help files. Any help would be...

## LinearAlgebra vs linalg...

`What is the Problem? Do not use SingularValues (A, output = ['list'])?Some care in handling this command?`

When integrating 1/x as int(1/x,x) the answer is ln(x) while it should be ln(abs(x)). How does one fixes this mistake?

## Why Maple 64bits is still running as a 32bits appl...

Hi friends,

I have windows 7, 64 bits, and I upgraded my maple to 64-bits version as well (Maple 13.02). But I wonder why in the task manager of windows, maple is still tagged as a 32 bits application (e.g. "maple.exe *32"  and  "mserver.exe *32")? In fact, I think the reason that I cannot run one my maple projects, which needs more than 2GB RAM, comes from this issue. Could you help me resolve the problem?

Thank you!

## Using fsolve with a dispersion relation...

I've been given the relationship:

R*sqrt(sigma)-1-(1)/(4)*(l-(2*kappa*R^2)/(R*sqrt(sigma)))/(1+coth(R*sqrt(sigma)))-kappa*R^2/6+m/(2*R), for the particular case where m=l=0, and where

R=exp[(kappa*(R^2))/6]. On a sketch of R vs kappa, apparently sigma >0 on the lower branch, but there should be some sigma < 0 on the upper branch.

﻿﻿﻿To attempt to solve this whole problem, I use the following commands:

restart;with(plots):

## How can I check the numerical solution of my diffe...

Hello

I have the following nonlinear differential equation:

deq := (diff(y(x), x, x))*y(x)-1+x*y(x)^2 = cos(x);

I solved it numerically:

sol := dsolve({deq, y(0) = 1, (D(y))(0) = 1}, numeric);

ysol := proc (x) options operator, arrow; rhs(sol(x)[2]) end proc;

plot('ysol(x)', x = 0 .. 5);

but I would like to substitute it to the left side of deq and plot it, to be sure that it's plot is the same as cos(x).

## Allocation Memory Problems...

Hi everyone, here we are again with more serius issues this time.

I have a system of DE to solve. My system is made of coupled 3 PDE`s with 1 ODE. My problem is that the computation is aborted due failure at memory allocation, here is the message:

"Error, (in factor/nexteval) Cannot Allocate Memory (size=151060480)"

I`ve checked the kernelopts about datalimit and its already infinity. My computer is a Turion x2 with 4Gb of Ram (system...

## Matrix(create and solve)...

Hi

I want to solve this

## Draw a line through all maxima...

I have a family of functions characterized by

f:=x^2+b*x+b*3;

I plotted some of them:

graph1:=x->subs(b=0,f):
graph2:=x->subs(b=2,f):
graph3:=x->subs(b=4,f):
plot([graph1(x),graph2(x),graph3(x)],x=-10..3,y=-5..15);

And now I want to draw a line through all maxima into the same diagram. The maxima have the coordinates (-1/2*b | -1/4*b^2+3*b). I managed to create a pointplot: