Does anyone know why png is not listed in the help on plot/devices?  The png device exists and works.

Also, are there any other unlisted plot devices?

When I export my plot to PDF, adobe acrobat says: A drawing error occurred. Other programs see my PDF as corrupt. I would use a .eps file, but my plot has a semi-transparent component that doesnt show up very well as an eps. Any ideas?

Thanks

Hello, I'm a newbie in Maple. I just started learning maple and i'm using version 17. I want to know if there is a way in maple to get the coefficients of some variables maybe an example would explain me better. Lets say we have

23x^4 + (12*h)x^2

So my question is that is there a function/method that can allow me to strip the coefficients of x^4 and x^2. Because I have a very long expression and I need the coefficients of the variables therein to populate a matrix.

hey friends please check this code for me..working1.mw

Hi there,

Is there a semi-definite program package in Maple available? I knew there is a SDP in Matlab. Currently I am running part of my program in Matlab then manually export the data to Maple. Which is quite inefficient. I find some paper about that. But I dont know where to download the code. Thanks!

Fei

I have reason to believe that the expression below is a real number: 

(1/6)*(-108+(12*I)*sqrt(1419))^(1/3)+10/(-108+(12*I)*sqrt(1419))^(1/3)+1;

A numerical approximation supports that. How can Maple help here to get a simplified expression?

Solving Helmholtz' equation by seperation of variables yields a solution of the form

(a*exp(I*k_x*x)+b*exp(-I*k_x*x))*(c*exp(I*k_y*y)+d*exp(-I*k_y*y))

if we consider a wave in the first quadrant that is moving away from the x axis then it has the form

c*(a*exp(I*k_x*x)+b*exp(-I*k_x*x))

is it possible to plot this wave in the first quadrant?

Also if I switch to polar coordinates (r,theta) can I produce similar plots of rays?

Good day,

I have plotted a family of lines in one graph, and now I want to shade an area between two horizontal (parallel) lines, for example 2 and 5.
So what I did was to use the command 'filled'. First I shaded the area in vertical direction from 0 to 2 white. After that I filled the area in vertical direction from 0 to 5 for example blue.
This results in a shaded area between 2 and 5 in the color blue, what I like to have.

Question: Is there a way (a command) to fill an area between two horizontal lines more easily? So that I shade it between 2 and 5 in just one commandline. Now I first make a part white, and then the next 'layer' behind is in the color I'd like to have.

Another thing is that when I shade an area in the color white, my gridlines disappear! Is there a way to avoid this?

I have found information about shading area between two intersecting lines (can be done relatively easy), but between two horizontal (parallel) lines I still can't find a simpler way to do it.

Somebody got a suggestion?

Greetings,
Frank

Hi there,

i would like to know, how can i change the x-axis labels of an graph?

Currently i read data from text file in format like this:

0 10

1 11

2 14

3 15

This values i plot in a graph with this commands:

averagedValues := readdata("mytextfile.txt", [integer, float]);
plot({averagedValues}, x = 0 .. averagedRowCount)

My problem is, that each x value has a date label....

Hello,

I think the answer to my question is not there yet.

So I would like to save some variables in a .m file in an another folder without using the whole C:/.../ thing.

The reason why is that I am using a windows and a mac so if work on my mac I can still execute my reading and my writting commands on my mac.

the file I want to write from is located in :

/Maple_projet/Code/Timoshenko/

and the folder I want to write to is in

I'm using maple 16 to do a surface plot w/ plot3d of a fairly complex integral. The integral involves a number of nested functions. The plot ends up taking a very long time. The surface appears to have many holes in it. In fact, only about half of the surface is plotted, and the rest looks like empty space. I know that the integral/function is defined at these empty points, because I can evaluate it there and get a real number. What can I do to fix this? I've tried different...

My problem is that I have two functions in two variables, say x and y. The functions are both polynomials in x, but sometimes y appears in an exponent. What I want to do is find the gcd of these functions as if they are viewed as polynomials in x. However, when I use the gcd command it says it can not do it because the arguments must be polynomials. I have tried redefining the functions as just functions in x (i.e. h(x) = f(x,y)), but it still does not work. So is there anyway...

hey friends please help me out of this error hmm_working.mw. 

thanks

Hi,

I'm trying to develop a new notation and am having problems with lists vs. sets.

Basically I have things of the form [[a,b]],[[c,d,e]],[[f],[f,h]] and I want to change them to the form [{a,b}],[{c,d,e}],[{f},{f,h}].

I start from a flat list [a,b,c,d,e,f,f,h] and then divide it up, so using sets initially would lose repeated elements. But then once it has been divided up, I need the innermost brackets to be sets.