Why is it that the command

plot( 'dphidx'(x,y,10,5,1/10), x= 0..1, y=0..1)

gives a good plot but I get an error for

evalf(Int(Int( 'dphidx'(x,y,10,5,1/10), x= 0..1) y=0..1))

Error, (in dphidx) cannot determine if this expression is true or false: 99/10 < x and x < 10.

Here's the code for dphidx:

dphidx:=proc(x,y,xj,yj,h) local v; if xj - h<x and x<xj then if yj - h<y and y<yj+h then if y<=yj...

How to find with Maple all symmetric matrices of  size 5, whose entries are 0,1, having only strictly positive eigenvalues?

One of the examples in the Overview of Vector Calculus documentation is int(x^2+y^2),[x,y]=Circle(<0,0>,r) .  I can find no documentation on "Circle"  What does the above expression mean anyway?

Ratch

Hello!

I made an upgrade from Maple 13 to 14, but a program i wrote with maple 13 (ode event handling) simply is incorrect in maple 14. The events aren't recognized anymore. What is the problem?

Thank You.

I have created a procedure called Tproc with 3 arguments (t,k,b). Now I want to calculate the partial derivatives of this procedure with respect to k and b. Looking at the help page of fdiff, i tried this:

but all maple returns is:

I want to solve an ODE but the result is not a polynomial as it should be, it just writes some integrations instead of solving this integrations. I show this problem as:

when I integrate the equation, instead of integrating it just writes integrate of the expression, what is wrong? I'm willing to integrate regard to x. My whole worksheet is uploaded. What should I do? I just right clicked on it and used integration. I'm using maple 13. As you see I want to solve the last ODE (F[0...

When a procedure is called that is nested inside of a module, it returns its own name rather than the value it calculates.  E.g. here is a very simple package:

somePackage := module ()

  export someproc; 

  someproc := proc (yr)

    return (2010);

  end proc

end module;

That compiles fine.  But when this is executed:

somePackage[someproc];

The...

I guess someone is kidding with me...

I want unsubscribing of this s... place!

when calculating the following equations

int( exp(t*int( (m/2*(diff(x, t))^2-exp(x)), t)), x)

maple give

-Ei(1, t^2*exp(x))

what is Ei? how to show result normally?

Can anybody please help me I posted this question last week and didnt get the response I was looking for. It is a question about explicit finite difference methods for pricing an option.

I understand the mathematics behind this and everything but I am not able to code it. This is where the probelem lies.

I'm using Maple 14 on OSX 10.5.8.  I have a lot of expressions that look like this:

(which doesn't seem to be rendering here...so in 1D form)

sum(a[n+2]*x^n*(n+1)*(n+2), n = 1 .. infinity)

My problem is the when using default fonts and 100% zoom the plus signs in the subscripts aren't...

I'm hoping that someone can help with this.  Below is an example of what I would like to do (part of a larger application):

> roll := rand(0 .. 1);

> roll();> s0 := %;                              

> roll();> s1 := %;                

With each execution, this will yield values for s0 and s1 that are randomly...

SADE is a package used for symmetry analysis of differential equations. I downloaded the package from the link http://cpc.cs.qub.ac.uk/authorIndex/AUTHOR_F.html. But unfortunately, I even couldn't execute the examples given by the authors of the SADE. Please inform be about installing the package in Maple 14.

So, I've defined procedures in a .mw file and now I want to somehow read this file into another worksheet, in order use the aforementioned procedures. Is this doable? I've unsuccessfully tried using the READ command. The error messages I get are :

Error, on line 1, syntax error, character `?` unexpected:

<?xml version="1.0" encoding="UTF-8"?>

Error, while reading ``file.mw``

Not sure where to go from here. Any help would be great!

Hi,

I am trying to graph some curve C and the vectors from the vector field corresponding to t=1 and t=-1.

My Vector Field is defined by some F(x,y,z) and my Curve is some r(t) [didn't bother putting the actual values here since I only want a general expression...]

In other words I want to have some kind of a curve in 3D with vectors coming out at points t=+/-1 along the curve itself. Is there any way to do such thing?

Thanks!