## Factoring cubics and 4th dehree polynomials...

I wish to factor the following: r^4 +10*r^2 +9*r = 0 I have entered it in Maple 10 as: factor(r^4 +10*r^2 +9*r); and I just get a repeat: response: r^4 +10*r^2 +9*r Am I doing something wrong or can not Maple factor this? I'm fairly new to Maple. Any help would be appreciated Larry Ciak aka malt_master@comcast.net

## Interactive Plot Builder...

First Question: Let's say I have just created a plot using the Interactive Plot Builder. What If I just want to tweak the expression in the plot. Is there any way I can get the Interactive Plot Builder to open with all of the info related to a specific plot already inside the plot builder, so that I could just tweak the expression and everything else would remain the same? In other words, is there any way around having to start from scratch with the Interactive Plot Builder? A related question is this: Assume there is a plot, created with the IPB, in your worksheet. Is there any way to click on this plot and find out what Maple commands would have created the plot if the user had done it that way instead of using the IPB?

## expand fraction...

i am trying to get maple to expand this expression into one entire fraction: a(1/2*e+1/2*f)^3+b(1/2*e+1/2*f)^2+c(1/2*e+1/2*f)+d and then after i need to substitute the sum of certain terms into the new expression...ie ae^3+be^2+ce+d = 0 also, is it possible to have the above expression entered in as an ordered pair, and then expanded and expressed in an ordered pair: ie expand this: ((e+f)/2,a(1/2*e+1/2*f)^3+b(1/2*e+1/2*f)^2+c(1/2*e+1/2*f)+d)

## problem of Determinant of summation of matrix...

Hi,there: I have a question regarding the operation of matrix. I would like to calculate the summation of two covariance matrixes, Sigmaw and Sigmab and then I would like to calculate the determinant the summation. The symbolic summation matrix is a 6*6 matrix however, Maple can not run it, does that mean maple could not run the summation of 2 matrices? How can I fix it? I very appreciate your help. Gloria Sun

## how to plot the output of a procedure?...

Hi there! I have a system of four non-linear equation that I can solve with fsolve after having provided the parameter values. I wrote a procedure which passes the parameters values, define all the equations and call for fsolve which provides the solution value for all the four unknowns. Now, I would like to plot each solution against the input parameters passed to the procedure. In other words, I want to make some comparative statics which shows as the solution changes as the parameters change. Of course, I'll make only two parameters varying simultaneously. I tried plot3d, but it doesn't work, because the procedure is not really a function I guess.

Hello, I just attempted to upload a .gif file of less than 10 kilobytes, and got an error message indicating that the file was too large to upload. Can I assume that this is a temporary problem that will be fixed ?

## 11x11 Matrix pretty print...

Hi, I have a 11x12 Matrix, that I would like to see all the elements of in "2D output" Is this possible? Rolf

## Polynomial rings with convolution multiplication r...

I want to find inverses of polynomials in the ring Z/nZ with the convolution multiplication rule X^n - 1 = 0. That is I want to find inverses, do multiplication in the polynomial ring Z[X]/(X^r - 1) mod n. Can maple do this?

## Open a maplet from the Maplet Builder and get 'dis...

I am using the Maplet Builder. I created the first example in the Advanced examples. I forgot to set the 'pause' to 'value'='true'. I had to leave Maple. I came back later expecting that I could open the maplet in the Builder and continue, but the Builder responds 'discard current content? yes no'. If I say yes, I get a blank maplet pallet; if I say no I get nothing. So I opened the text of the maplet and added 'value'='true' and then ran the maplet. It ran fine. But when I tried to open the maplet in the Builder, it said that an exception had ocurred. What am I to do?

The attached file solves a system of equations in a couple of seconds in maple 9.5 But in classic worksheet maple 10.04 after many minutes it gobbles up gigabytes of memory and then ends with an error. The file belows shows the details but it has the form sys:={eq1,...eq22}: solution:=solve(sys,{var1,...var22}): Any comments very much appreciated. Download 2129_No Solve.mws

## help big time newbie...

i have a equation such as : f(qa)= 75-0.4*qa^1.5 i would like to know how to know the maximum of qa when qb is 0 and vise versa. also how to plot a slope a a given point for example qa = 0 or 20.

Hi, My name is Jennifer.Iam new to Matlab programming.Iam working on reducing the noise content in audio communication. Iam using Hamning codes for the same.I have a sample code with me,which iam unable to upload because it says that maximum file size exceeded.Iam unable to understand how it works.Can someone please explain me how the code is written,what it means and what the different plots mean and how to read them? I have trouble especially with the plots trying to understand them. Being a beginner,Iam having a lot of trouble trying to understand.Iam trying to read Matlab tutorials at the same time but I have to finish up this work soon before the deadline.So can anyone be kind enough to help me through this please? My email id is jennifer22cute-single at yahoo.com