## Accessing the values from the solve command

by: Maple
I am just getting started with Maple TA for Calc III. I am trying to solve LaGrange multipliers. When the solve command returns multiple sets of answers, how do I extract the specific values for the subs command? \$f=xyz; \$q=x^2+2y^2+3z^2-6; \$g=maple("f+mu*\$q"); \$exp1=maple("diff(\$g,x)"); \$exp2=maple("diff(\$g,y)"); \$exp3=maple("solve({\$q,\$exp1,\$exp2},[x,y,mu])"); \$ans1=maple("subs({x = ????,),y =???? )},\$f)"); \$ans2=maple("subs({x = ????,y = ????},\$f)"); The question marks are where I am lost.

## Dr. Euler's Fabulous Formula by Nahin...

I am reading Dr. Euler's Fabulous Formula by Nahin. I'm trying to reproduce the graphs that Nahin shows on page 88 using Maple 11. Nahin is a Matlab man. Here is a Maple file that doesn't work: 4937_Page 87F.mw

## Curve colours in 2-D plotting

by: Maple
I'm finally going to start my MaplePrimes blog, and I will post answers to some of the questions I get about the areas with which I'm familiar. Most of time, I get asked about 2-D plotting. Some of the information here may be repeated from forum comments, but hopefully, this will make it easier to find. Unfortunately, my participation on MaplePrimes comes in spurts, as I try to find time between my other tasks, such as developing features for new releases. I tend to rely on the many Maple experts on MaplePrimes who very competently answer most questions that arise. I will, however, try to be diligent about adding a new tip at least once a week. Let's see if I can live up to my promise and get beyond this first post!

## Maple 11 and 2D plotting...

I wanted to see if someone could point me to where I can learn about 2D plotting. I have been using Mathcad and switching over to Maple (or trying to) and some of the things that are very intuitive in Mathcad seem hidden here. Specifically I'd like to know how to set a graphs zoom or view area without having to literally sit and zoom. I'd like to know how to find quick keys for doing things like inserting a sqrt or infinity symbol and so forth. In Mathcad there are special keys for most all of the mathematical symbols allowing quick keyboard entry instead of having to go search down tool bars.

## How do I export .mws to XHTML using command line?...

Hello everyone, First of all, sorry if this question has already been asked, but I am trying to convert an .mws file into a XHTML file (using gif images), using the command line. I'am actually building a website (documentation, FAQ, ...) for a website about a Maple package, and I would like to automate the whole process, so the MWS files would be converted in XHTML easily. Can anyone help me?? Thanks

## beginner's tip...

Sooner or later, you'll like see the following "tip" in with the tips that load when you start Maple, but in case you've overlooked it you should really give this one a try. Just type in: ?examples/index

## How to simplify an expression??...

i have a long analytical expression, which i would like to strongly simplify. Unfortunately, i tried with simplify(%, size).... but this expr still remains long. I also tried with optimize(%,'tryhard') commands, which works pretty well, but i cannot control the assignments....t1,t2,..... How i can control the assigment procedure? Or probably i'm not considering some other commands which are able to reduce the size of a long expression!!! Cab you give references?? Tnx a lot. Paolo

## Finding roots of transcendental function...

The link can be found in the <a href="http://www.mapleprimes.com/filemanager" target = '_top'>File Manager</a>

Hallo, I was wondering if anyone had any pointers about writing/ reading complex mathematical expressions such as these, [(34 - 30I)*exp(1.5 - 6*i)(theta)] + [(25 - 35*I)*exp(2+3*I)(theta)] into/from a text file. I need to copy such data from one maple worksheet into another. I appreciate any advice in this matter. Regards, Virat

## Maple calculator not giving you an answer? - Try...

This may have already been resolved but in case some people are still having problems... If your maple calculator is not working (ie not giving you an answer .. just giving you a blank line) your firewall may be blocking the java.exe script in your maple\jre\bin directory. Just allow access for this file. So just create a new rule in your firewall to allow full access for the maple\jre\bin\java.exe file and voila your calculator should now be giving you some answers. Hope this helps. And sorry for posting again if someone already mentioned this in the past.

## how do I "sum" odeplots?...

Hi everyone! (I'm Fench, hope my English isn't too bad). I use Maple to solve non-linear differential equations using a numeric method, and I plot these solutions using the basic: >slnew := dsolve({set1, set2, a1(0) = 0, a2(0) = 1, (D(a1))(0) = 0, (D(a2))(0) = 0}, {a1(t), a2(t)}, numeric); >plot1 := odeplot(slnew, [t, a2(t)], t = 0 .. 10, numpoints = 10000); So far it's ok. However, I'd like to compare the difference between the solutions when the initials conditions are slightly different, say, a2(0)=1.1 . So I use the same procedure to create a plot2, and I use: >display(plot1,plot2);

## Help with plotting...

Good day everyone! First of all I want to excuse my self for my english: I don't know it well. But this forum is my last hope. I need to solve the next task: For example, there is a ring: x^2+y^2 I need to colour the area in this ring. I didn't find how to do it by Maple function's. All I found is a function inequal, but it work's only with linear inequalities in two unknown variables, and this is not exacly what I need. I have tried to do it using function implicitplot with option filled=true, but it work's good only with circle(for example, x^2+y^2<>).

## finding sharpest upper bound...

Hi, I am new to Maple and need some helps to find the sharpest upper for fab:=(a^2-k*a+a)/2+(b^2-k*b+b)/2+a*b/2 subject to 2