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

Is it possible to plot a second-order differential equation without specifying the initial conditions?

Has anyone ever used Maple to help with winning at chess or checkers ? v/r, Dan

The Publisher of Discrete Math by Rosen has online resources containing Maple code to use for the class. I am getting errors when I try to run the code. I'm using Maple 10.04 Build ID 233114 Does anyone see what the problem is? Here is a portion of the code: View 2816_Code for Module 6.mw on MapleNet or Download 2816_Code for Module 6.mw
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I'm taking Discrete Math and we are supposed to use Maple to submit assignments. It did not seem to work for many examples given on McGraw Hill's online learning center. My first concern is how to load the rosenlib given at http://www.mhhe.com/math/advmath/rosen/r5/student/maple.html -------------------- The Maple Supplement This book is a supplement to Ken Rosens's text Discrete Mathematics and its Applications, Fifth edition. It's entire focus is on the computational aspects of the subject. To make use of the code found in this supplement you need to make use of a special library that has been developed to supplement Maple for this book.

Does anyone know how to type theta with a double dot on top of it as a second time derivative in maple 10?

I'm trying to numerically evaluate an integral using the evalf function, but I keep ending up with just the value "Float(Undefined)". After manipulating the expression in different ways I also get other error messages stating that something or value is too large. Can someone please help with this ? thanks, (worksheet attached in this message) Dan. Download 285_casimirEENG501HW5.mws
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Ich searched a lot but solve return me an error or just don't solve it. An the linsolve package is the wrong for that use How can I solve something like this with maple: A := Matrix(2, 2, {(1, 1) = a, (1, 2) = b, (2, 1) = c, (2, 2) = d}) E := Matrix(2, 2, {(1, 1) = 1, (1, 2) = 0, (2, 1) = 0, (2, 2) = 1}) solve((VectorCalculus[DotProduct])(A, A) = E) brings an error A korrekt solution would be for A for Example Matrix(2, 2, {(1, 1) = 0, (1, 2) = 1, (2, 1) = 1, (2, 2) = 0}) us rene

Hi, I would like to project the 3D surface generated from the following equation to the xy plane (2D): Itouch50 := -0.4058074876e13*sqrt(1.+h)/(sqrt(ts)*(-500000000.0*ln((625.+125.*h+25.*h^2+5.*h^3)/h)*sqrt(1.+h)+587311661.7)) where x=Itouch50 y= ts and z= h Moreover, if possible, I would like to calculate the equation of the projection or the equations giving the upper and lower side of the projection. Finally, if I had multiple equations as the initial one, would it be possible to create their accumulated projections on the same plane. I know that Im asking for too much, but any help would be extremely appreciated.

Currently I am using worksheets. Please help me how to Create and read .mpl files in Maple. Can I use worksheet for this? On using read command in worksheet to access a " .mpl" file it shows "Error, on line 1, syntax error, character `?` unexpected:" Please help me on this.

so i have the following functions in my college calc class for our maple homework assignment: f(x)=x^4 and g(x)=6^x i have to plot them and then find their point of intersection using maple. i have no problem plotting it but i cant seem to figure out how to find the intersection point. all the ways i have tried just give me a list of answers with natural log and something with the word LambertW in it. if some one could help me out i would greatly appreciate it.