# Items tagged with equationsequations Tagged Items Feed

### Triangular matrix "forward substitution"...

April 26 2006 by
Implement a computer program which, for a given lower triangular matrix A with the diagonal entries different from zero,finds the matrix inverse to A by solving the equations Axj= ej for j=1,...,n by the " forward substitution"

### Maple 10: Copy and Paste from Differenti...

April 26 2006 by
The feature which allows users to copy and paste the equations from Differentiation or Integration Tutor is disabled after i install Maple 10.03 update This feature is useful for lecturers as well as students. I wonder could Maplesoft enable this feature in the coming update. Thank you.

### system of ode of predator prey models

April 25 2006 by Maple

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hi, i don't know maple at all and i need to figure out how to solve this sytem of equations that model predator prey systems in maple but i get an error when i modify this code > e1 := diff(x(t),t) = k*x(t) - a*x(t)*y(t); > e2 := diff(y(t),t) = -r*y(t) + b*x(t)*y(t); to fit this equation- dx/dt = 2x(1-x/4) - xy dy/dt = -3y + xy x(0) = 1 y(0) = 1 if anyone has time to tell me what i can do to get the equilibrium points, the solution and the table of values for this system, i would be grateful

### MathMLViewer: fontsize bug?

April 12 2006 by

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Maple 10 (patched to 10.03) is inconsistent with its font choice in Maplet MathMLViewer elements when the fontsize option is set. If you don't set fontsize, then equations are typeset as expected with variables in italic font, just like in an ordinary Maple worksheet. But if you set fontsize to say 18pt, suddenly the variables are typeset in upright font. For instance try the following:
with(Maplets[Elements]):
Eq := [diff(u(x,y),x)= diff(v(x,y),y), diff(u(x,y),y)=-diff(v(x,y),x)];
maplet := Maplet([
[BoxCell("Fontsize 18:")],


### How to plot the area bounded by { f(x...

April 10 2006 by

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To anyone: Will someone provide maple syntax to plot the following lines f(x), x=a, x=b from x=c..d where f(x) is an explicit function and x=a and x=b are vertical lines and the extend of the graph from x=c to x=d. This should give me the graph of the 3 equations from x=c to x=d. I tried implicitplot, graph it led me nowhere. Many thanks PV

### New User

April 10 2006 by

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How do I use Matrices to solve linear equations?

### Function equations

April 09 2006 by Maple

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Hi, i'm new to using maple, and so far been ok solving equations, by figuring out the code forthis has got me stumped and would appreciate any help people can give me. basically i'm trying to find the smallest value of x>0 for which the function f(x)=sinx/x has a minimum and to find the coressponding value of the function. However i keep getting error messages, as my code probably does not make sense. could any one help pls? thanks.

### Solve linear equations

April 09 2006 by Maple

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hi, I want to solve linear equations with the assumption that Maple round every step of the evaluation accurate to 2 decimal places. for example: > solve({1.11 x - 2.13 y + 1.14 z = 1.23, 0.32 x + 1.44 y + 3.02 z = 4.10, 1.27 x - 1.14 y + 2.54 z = 5.67}, [x, y, z]) x=19.59 y=7.38 z=-4.24 and not [[x = 19.09759807, y = 7.184806478, z = -4.091838645]] thx for your help

### Complex solutions

March 30 2006 by Maple

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Hello I have tried solving quite simple equations, but maple seems to give me a complex solution or complicated one. Ex.: ode := diff(h(t), t) = -.168*sqrt(h(t)) ics := h(0) = 225 dsolve({ode, ics}) h(t) = RootOf(250*sqrt(_Z)+21*t-250*sqrt(225)) I know it is a correct solution but it seems a bit wrong anyway, with both sqrt(_Z) and Rootof

### How to check the consistency of a system...

March 28 2006 by Maple

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I am working on a Maximum Likelihood problem and would like to know whether the LinearAlgebra package can be helpful. Up to now I have been using Maple only to check my work. However, someone pointed out that Maple's capabilities reach much further: it also can determine whether the system of equations is consistent and, if so, Maple can solve the equations. Unfortunately, I am only trained as a psychologist and I am still at the beginning of learning Maple's capabilities. Here are the three equations: f = (Y'b - 1t'b)(b'b)^-1 equation#1

### maple programing

March 21 2006 by Maple

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I just wnt to know that in maple programing if i have a set of system of equations in which subscripted variables are used then how we find the solution of that system for example we have set of equations as eq_set:={-v2,1-a2=0 ,3v0,3+2v2,1=0 , -b2+3v3,0-2v1,2=0 , v1,2=0} here we want to find the values of subscripted variables v2,1 ,v0,3 v3,0 , v1,2.Kindly help me.

### Arrays of equations and the Numeric...

March 21 2006 by Maple

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Hello, I'd like to use the BVP solver to find the numeric solution to a large set of differential equations. The thing is, I have about 60 equations differing only by constants in the derivitave. Instead of typing in a set 60 equations with different constants, is there an easy way I can create an array of equations and use it with dsolve? Thanks!

### real roots

March 13 2006 by Maple
I am using the solve command in a proc to solve some simple equations. Is there an easy way of determining if the solution is an imaginary number? (basically I only want real solutions... sometimes the solutions will be in the form of a=b+1, i.e. in terms of another variable, and sometimes it will just be some number... once getting the solutions using something like ans:=solve(eqn,{vars}), how can I determine what type it is? JM

### Newbish question, issues with plots[multiple...

March 08 2006 by Maple

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Running into this problem, im trying to graph concentric circles (think planets) with a set radius and a set amount of time used to complete one orbit. I am using parametric equations with t being a value of time in terms of one complete orbit. However, when I try to graph these circles using plots[multiple] I get error codes. Heres my text~ We have our 5 planets, A - E orbiting around the sun affixed at the origin. We can easily graph these together to give us an idea of the orbit and time required to complete one. > plots[multiple](plot, > [0.71 cos(2.985074627 Pi t), 0.71 sin(2.985074627 Pi t), t = 0 .. 67],

### Gauss elimination for band matrix

March 08 2006 by Maple

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i have a program to write and i dont know how to do it. if anybody could hwlp me cheers. Q implement a computer program which fora given positive integer n, a given square matrix A of order n and given vector b which n components, decides whether A is a band matrix with p=2=q and in the positive case solves the system of equations Ax=b by simplification of Gauss Elimination for a band matrices with p=2=q
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