I am trying to display multiple integrals with the equation editor in my questions. If I use the name $eqn, for example, it does not put that in HTML format. It may leave it: x^2 +y^3. I have tried putting my variable into HTML in the algorithm but then it will not display at all. Any suggestions? I have avoided the editor as much as possible but it is impossible with definate integrals.

Maple folks,
I am a Maple newbie. I am trying to figure out how to graph an inequality:
x + y

Hi all,
I am just playing around with Maple, with curiosity, to see how smart it is and how much can I rely on it for work...
Here is a probably difficult integral, I couldn't get Maple to do it:
assume(b>0, T>0, a>0, w>0);
int(exp(-b*sqrt(w))/sqrt(a^2+w^2), w = T .. infinity);
Is there a way to get it work? I tried a few numerical values, this integral should converge... right?

Hello,
I have a problem with a system of ODEs. The three differential equations are as follows:
diff(c(t),t) = 2*(c(t))^2 + 21/50*c(t) - 1/100*(h(t))^2 - 1/5*c(t)*h(t) - (9/2000)*h(t) + 49/4000;
diff(h(t),t) = h(t)*(c(t) - 1/5*(h(t)-1));
diff(k(t),t) = 8/100*k(t) - h(t) - 1/5*k(t)*h(t);
`diff(c(t),t) = 2*(c(t))^2 + 21/50*c(t) - 1/100*(h(t))^2 - 1/5*c(t)*h(t) - (9/2000)*h(t) + 49/4000;`

`diff(h(t),t) = h(t)*(c(t) - 1/5*(h(t)-1));`

`diff(k(t),t) = 8/100*k(t) - h(t) - 1/5*k(t)*h(t);`

As t goes to infinity the three variables c(t), h(t), k(t), respectively, approach certain values -in this setting `1/50`

, `11/10`

, `55/3`

, respectively- with the values of the derivatives converging to 0. (The point is saddle path-stable.)

Hi all,
I am just curious about this problem, which has been in my mind for long time.
I have seen some complex-valued functions, which are not in closed-form. For example, the complex-valued functions are defined by ODE:
y'(t)=a+b*y(t)+c*(y(t))^2 + ...
where the numbers in above ODE are complex-valued and the complex-valued functions are defined by functions of y(t), such as exp(y(t)), etc. Such ODEs can only be solved numerically. Sometimes even a closed-form solution is available, we would rather choose to solve it numerically because the closed-form solution often involves hyper functions and super complicated expressions.

I have the following:

> / / 2 \\
> 1 | 2 2 |/ 2 2\ 2 2||
> eqn := - +\b + a , sqrt\\b + a / - 4 a c // - c
> 2
(1/2)
1 2 1 2 1 / 4 2 2 4 2 2\
eqn := - b + - a + - \b + 2 b a + a - 4 a c / - c
2 2 2
> solve(eqn, c)
2 2

I want to solve the following task efficiently.
I need to read data from S files (in my case S = 50000).
Each file has T rows of 5 floats each. Here T=1000 is
a time index and 5 is the dimension of a dynamical system.
From each file I want to read the j coordinate and to assign
its T values to a column in a matrix X. At the end of
this process I'll have an X array or matrix of dimension
T x S. How can I do this efficiently?
When I use 'readdata'
in order to read the Tx5 matrix from a single file into a
list D, this is a fast process. But assigning, naively,
the j column from this matrix to my matrix X, using a for loop,

Hi, I am Er. Vishal Jain new to maple prime. I need help in developing dynamic 2D-graphs(pi-chart, conic section etc.) in .mw and respectively shade the graph.

While posting an initial question is not problematic, when editing or adding a comment thereafter, one is presented with a box in which to compose that is partially concealed by content at the right of the screen, e.g., Active forum topics and Recent comments. One can continue to type behind the veil and have it display fine in the preview, but this seems anomalous. I have noted it on two different computers.
Do others have this problem? Is there a way to work around this besides truncating ones sentences with early returns?

As per instructions at the bottom of page 217 of the user manual, I wish to alter the y-axis range of a 2D plot. The instructions say to right click the plot region. Select **axes** and then **range**, however, doing so allows one to select axes, but the menu item **range** is nowhere to be found in the menu as described by the manual. The menu only offers the choices of **normal, boxed, framed, none, properties, labels, toggle gridlines, and set gridline properties**.

My old Mathcad 7 had a snap to function that allowed one to trace a given plot. Using the point probe on Maple does not seem to have an equivalent feature. If one wants to know a particular x y location, one must hover the point probe over the desired spot, but this is not ideal as it it very sensitive to movement.
Is there a snap to feature for tracing plots? If so, how is is activated?

Hi All,
I am new to Matlab.Could you please tell me how to translate the Matlab code to c++ code i.e to convert *.m to .cpp.
If there are some explicit tool please let me know.
Thanks in advance,
Vinay

im new so excuse the relavie easy ness of this question.
i typed
>plot(1/7-5*(sin(x)),-10..10,-10..10);
then
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
and an empty graph comes up i looked on the help page but i dont really understand it, i was hoping mapleprimes can help???
once again sorry for the easyness of the question!!!

I am using windows vista but with office 2003. I am also using maple 11 with the 11.01 build.
On installing maple excel addin I have this error:
'VBE6EXT.OLB' could not be loaded.
Clicking OK gives another error: 'Unexpected Error (50001)'
Now I can't even open the VB Editor. I get the error message: 'Out of Memory'
Any help?
Thanks.

Hi
I am trying to combine a previous, numerically obtained result in a subsequent calculation:
outline:
suppose i have a given function, f(x), and i wish to construct the following boundary value problem:
y''(x)=f(x), y(0)=1, y(1)=2
the known function f(x) is a result of another calculation, which i have obtained numerically. (f(x)=proc(x)...end proc, or something to that affect).
code:
--------------------------------------------
> restart;
> sys := {diff(y(x), x) = x, y(0) = 1};
/ d \
{ --- y(x) = x, y(0) = 1 }