I'm continuing to work on my Maplet with the question bank, and can succesfully read in files outside of the Maplet using the readline command and parse. However, this is limiting in the fact that the user has to type in the name of the file in a Maple command line.
I would like to use the FileDialog to have them select the file with the questions and answers. It's easy to use RunDialog with to run the FileDialog, but once they've selected the file, how can I assign that "string," say, ["E:\questionbank.txt"] to a variable that I can use outside of the actual Maplet code? I need to throw it to the readline procedure I created so it can read each line and parse them, etc.

What's the simplest MAPLE command that would change

into

I have following expression.

There is one for yhat under "Roman Extended Lower Case", but for some reason there isn't one for x. Why is that the case? Am I missing something? Problably so. Please help. Thanks much.

Hallo,
with "textplot" one can get a horizontal text. Can man get an inclined text also, for example, along an vertical line?
thanks
jahn

I am a new user of Maple. Please tell me, why Maple can't sort : 1+sqrt(3) and 1-sqrt(3) ?
Thankyou !

Im trying to author a maplet which executes numerical integration on a function for an interval. Here is what I have so far.
This is a the part of the assignment that didn't require maplet format. (This part I got to work)
restart;
a:= 1; b := 3;
f:=x->100/x^2*sin(10/x);
L:=[];# which is list of lists
ListOfEndPts:=[b];
found := false;
MaxNoPasses:=70;
tolerance:=1.0e-4;
simpAB:=evalf(student[simpson](f(x),x=a..b,2));app:=0;
for PassNo from 1 to MaxNoPasses while not found do
print("**********************************************");
middle := (a+b)/2.0:
print(`Pass number` = PassNo);

Hello
Is there any possibility to check how long solve will need for a solution?
I have to solve a littlebit complex equation set, so solve seems to need a little longer than usual.
In my case I have tryed it for about 2 hours .. than I had to turn of my notebook.
If it would be possible to check if solve would work for month, weeks, days or hours it would be a great help.
us rene

Hi. I tried to solve some excersices but with this one I've got a little problem. I was asked to calculate the area of a circlesegment with radius R and midpointcorner 2*alpha. I have chosen the straigt side of the circlesegment to be parallel with the y axis.

I get these formulas in polarcoördinates.

oppp:=Doubleint(integrand(pool),r=R*cos(alpha)/cos(theta)..R,theta=-alpha..alpha);

alpha R

/ /

| |

oppp := | | | r | dr dtheta

| |

/ /

Hi,
I've solved a system of nonlinear equations by hand, but I'm not sure if my answer is correct. I would like to verify my results with maple's output.
However, I am having some trouble using maple:
Here's my code:
> eq1:=2*(x*r) + 2*(y*s) + 2*(z*t)-(t^2) + (r^2)=0:
> eq2:=3*(x*(r^2)) + 3*(y*(s^2)) + 3*(z*(t^2))-(t^3)+(r^3) =0:
> eq3:=4*(x*(r^3)) + 4*(y*(s^3)) + 4*(z*(t^3))-(t^4)+(r^4)=0:
> fsolve({eq1, eq2, eq3});
Error, (in fsolve) number of equations, 3, does not match number of variables, 6
where r, s, and t are coefficients/constants and x, y, and z are variables.

Hello all,
I'm looking into visualizing/solving the Lotka-Volterra equations in Maple 10. In doing so I've run into a few problems:
1) When executing the following commands
```
> odeqs:= {diff(N(t),t) = a*N(t) - b*N(t)*P(t), diff(P(t),t)=c*N(t)*P(t) - d*P(t)}:
> # Growth rate of prey
> a:= 3;
> # Predatation rate
> b:= 2;
> # Growth of predators as a consequence of predation
> c:= 1;
> # Mortality rate of predators
> d:= 1/2;
> # Initial Conditions
> initConds:=[N(0)=(5/3),P(0)=(10/9)]];
>
> # Display number of prey as a function of time
> DEplot(odeqs, [N(t),P(t)], t=0..100, N=0..7, P=0..7, initConds,
```

Is it possible to plot a parameterfunction in Maple?
Something like:
x:=t^2-1;
y:=t^3-t

I use:
min_v, max_v := rtable_scanblock (cc_matrix, [rtable_dims (cc_matrix)], 'Minimum', 'Maximum');
min_v, max_v := 0., 0.995879045499999948
and get a min and max value.
My Question is how can I get the index of my max value from my Matrix cc_matrix?

Hi, I am trying to plot a chart where I have used textplot to define the x-axis. I only want the y-axis to show, but can't work out how...
Any ideas?

I have a 2nd-order differential equation dEq and a set of initial conditions initC. I solved the equation by:
soln := dsolve({dEq, initC}, numeric)
the solution should be in the form r(theta) = blah blah
Now I want to plot a graph of theta and r so I used
with(plots);
polarplot(soln, theta = 0 .. 2*Pi);
which didn't work out!! I don't know what might be the problem.
Please help
thanks