## Simplifying with extra condition....

I have following expression.

## looking for special symbol xhat, or circumflex...

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.

## How can I get a text along an inclined line?...

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

## Why Maple can' t sort 2 real numbers?...

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

## Numerical Integration Maplet ... need help....

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);

## How much time will solve need?...

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

## Problems with computing double integral...

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
| |
/ /

## Solving system of nonlinear equations...

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.

## Questions about dsolve(...,numeric), odeplot and D...

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, ```

## Parameterplot...

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

## how can I get the index x and y from my matrix A w...

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?

## Plot a graph with only one axis?...

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?