## Populating a spreadsheet within a procedure...

The attached worksheet defines a procedure CircumStrain() which is supposed to create and populate a spreadsheet with the solutions of several equations.  The problem is that the spreadsheet Strain is never created.  Would someone please evaluate the worksheet and perhaps suggest a fix.  Your assistance is appreciated.

Wayne

View 4865_Chan McMinn B.mw on MapleNet

## OpenMaple Java...

Ive posted in the past about this, or similar, and it seems neither here or out on that scary www is there one person who knows and is willing to help.

Could someone either explain in better detail, or point me in the direction of better assistance as to how to compile even the simple OpenMaple Java sample supplied in the Help of Maple 11.

I have tried and failed, I know java, but once I had to start changing global variables of my system I started getting nervous.

## How do I export a ps figure without borders?...

This may be a bug, or maybe I'm just missing something.  In Maple 11 on both Linux and Windows, the following snippet:

## how do i put this ...a procedure question...

Hi, >mystpoint:=proc(f) > local A,B,Cstpts: > > uses Student[MultivariateCalculus]: > stpts:= solve({diff(f,x) = 0, diff(f,y) = 0},{x,y}): > Jacobian(

## how do i check all members in a list at the some t...

hi, suppose i have a list s:=[1,2,3,4,5,6,7,8,9] and i want to know if all the elements are great than zero so the outout "true" is expected in this case and for s2:=[1,-2,3,4,5] "false" is expected. any advice? thanks, CasperYC

## solving a pde with boundary and initial conditions...

Hiya, I'm trying to solve this pde in Maple:

> PDE:= diff(c(z,t),t) = k*diff(c(z,t),z\$2) + w*diff(c(z,t),z);

where k, w are constants, but I don't know how to apply the boundary conditions:

c(0,t)=0 and 0=k*diff(c(z,t),z\$2) + w*diff(c(z,t),z) at z=h

and initial condition c=f(z) at t=0

I know by hand you would solve by separating variables, but is there an equivalent method in Maple?
Eventually I want to plot c(z) for given times to show how the solution evolves... but one thing at a time!

## How do I program a partial differential operator t...

Thank you everyone for all your help. However, what I am leading up to in my research requires that I overcome the following hurdle. Let p[m] represent an unspecified function of three variables, e1, e2, and e3. (In reality, the explicit formula for the function is known, but I will not use that formula.) m is an index. So, p[1], p[2], p[3] etc are different functions of e1, e2, e3. I need to program an operator, T, which acts on p[m] and returns - symbolically - T(p[m]) = 1*e1*diff(p[m],e1) + 2*e2*diff(p[m],e2) + 3*e3*diff(p[m],e3) In case anyone has guessed already, T has gone under such

## Labels on plot axes

by: Maple
The third example on the Plot Tickmarks and Gridlines help page - ?plot,tickmarks(tickmarks) - shows how to put labels at specific locations on a plot axis. But I couldn't find anything in the help pages about altering their font. However by changing the labels to names (enclose in left quotes, instead of double quotes) their font could be set using the axesfont option.

Perhaps something could be added to the example mentioned above. In the longer run though, all the help pages for plots need to be re-written: at present they resemble an untidy scrapbook.

J. Tarr

## effective sequence coding?...

What would be an effective way to code a sequence of numbers Y(t):=Poisson random variable with mean X(t) and X(t):=M+phi*X(t-1)+alpha*(Y(t-1)-X(t-1)) for 0<alpha<phi<1, M>0? Thanks.

## Phase potrait plot...

I am currently studying the phase portrait a differential equation: diff(y(t), t, t) = -piecewise((diff(y(t), t))*y(t) <><> 0 <><><> Initial conditions are: y(0) = 1; , diff(y(0), t) = 0; The phase portrait plots diff(y(t),t) with respect to y(t). I achieved the phase portrait using Simulink; with a few gain blocks, a switch and a X-Y scope, easily enough. When i was done, i wondered if i could analyze the equation with a more mathematical approach. I decided to try and plot the phase portrait using Maple 11. I have tried various commands to solve the differential equation with Maple 11 but so far i have confused myself.

## Contourplot bug

by: Maple
The command > contourplot(-1,x=0..1,y=0..1,contours=[0],filled=true); is supposed to fill the whole space with red (color for negative values) but it does nothing this is also problem once I need to define a piecewise function which is constant according to some condition, e.g. > f:=(x,y)->piecewise(x>1/2,x*y,-1); > contourplot(f(x,y),x=0..1,y=-1..1,contours=[0],filled=true); this should fill the entire half plane x>1/2 with red, it fills only part of the first quadrant...

## Problems with plotting user defined functions

by: Maple
The simpliest version of my problem is this: > f:=(x,y)->fsolve(sin(x+y+z)=1,z) > f(5,5); still ok but now: > plot(f(x,5),x=5..10); sais: "Error, (in fsolve) x is in the equation, and is not solved for" it seems as Maple would not first evaluate x:=5 and then solve f(x) :'(