## Theta doube dot...

Does anyone know how to type theta with a double dot on top of it as a second time derivative in maple 10?

## Float Undefined Error...

I'm trying to numerically evaluate an integral using the evalf function, but I keep ending up with just the value "Float(Undefined)". After manipulating the expression in different ways I also get other error messages stating that something or value is too large. Can someone please help with this ? thanks, (worksheet attached in this message) Dan. Download 285_casimirEENG501HW5.mws
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## solve a non-linear matrix equation...

Ich searched a lot but solve return me an error or just don't solve it. An the linsolve package is the wrong for that use How can I solve something like this with maple: A := Matrix(2, 2, {(1, 1) = a, (1, 2) = b, (2, 1) = c, (2, 2) = d}) E := Matrix(2, 2, {(1, 1) = 1, (1, 2) = 0, (2, 1) = 0, (2, 2) = 1}) solve((VectorCalculus[DotProduct])(A, A) = E) brings an error A korrekt solution would be for A for Example Matrix(2, 2, {(1, 1) = 0, (1, 2) = 1, (2, 1) = 1, (2, 2) = 0}) us rene

## Project a 3D surface on the XY plane?...

Hi, I would like to project the 3D surface generated from the following equation to the xy plane (2D): Itouch50 := -0.4058074876e13*sqrt(1.+h)/(sqrt(ts)*(-500000000.0*ln((625.+125.*h+25.*h^2+5.*h^3)/h)*sqrt(1.+h)+587311661.7)) where x=Itouch50 y= ts and z= h Moreover, if possible, I would like to calculate the equation of the projection or the equations giving the upper and lower side of the projection. Finally, if I had multiple equations as the initial one, would it be possible to create their accumulated projections on the same plane. I know that Im asking for too much, but any help would be extremely appreciated.

## Creating and Reading .mpl file...

Currently I am using worksheets. Please help me how to Create and read .mpl files in Maple. Can I use worksheet for this? On using read command in worksheet to access a " .mpl" file it shows "Error, on line 1, syntax error, character `?` unexpected:" Please help me on this.

## finding intersection point...

so i have the following functions in my college calc class for our maple homework assignment: f(x)=x^4 and g(x)=6^x i have to plot them and then find their point of intersection using maple. i have no problem plotting it but i cant seem to figure out how to find the intersection point. all the ways i have tried just give me a list of answers with natural log and something with the word LambertW in it. if some one could help me out i would greatly appreciate it.

## second-order differential equation...

I have a second-order differential equation ``` dEq := diff(theta(t), t, t) = sin(theta(t)) ``` i would like to find the solution of it, so ``` soln := dsolve({dEq, theta(0) = 0, (D(theta))(0) = 0}, theta(t)) ``` and then plot the solution, that is plot 'theta' vs. 't' but the solution contains weird charecters and I tried many examples on the net but never worked out for me. Can you guys help? thank you in advance.

## Q about 'argument'...

Why there is no way (except I am stupidly missing something) to let
Maple convert exp(phi*I) to argument with piecewise discussing the
input (as it is explained quite nice in ?argument)?

Even assume(-Pi < phi, phi <= Pi) does not help and results in some
arctan(sin(phi),cos(phi)) and convert(%, piecewise, phi) does not
give the desired presentation.

## Posting worksheets...

I recently posted a worksheet to my blog. I used the feature in the MAPLE file manager which turns a worksheet into code so it can be displayed more or less the same way it looks in MAPLE. I copied this code and pasted it into the text of my post. When I did a preview I saw what I would refer to as the "blue equations" but for the equations I actually typed into the worksheet at the MAPLE prompt, I only got boxes which said "Maple equation". When I click on these boxes nothing happens. So someone would really have to open my worksheet to get any sense of what I was talking about, which was not what I intended. I don't recall running into this problem before. Maybe I am doing something different than before and just don't know it. I would appreciate any suggestions.

## install maple 9 in ubuntu linux...

Hi Our university (Univ. Sao Paulo - Brazil) has license for maple 9 (not sure which release).. It can be also that the version they have is Maple 6 since there is a xmaple6 in the files (see bellow) I use in my machine Ubuntu linux, the newest version. Althoug it says it has linux support for maple, nobody was able to install it from the instructions provided from above to us, users. I will describe the situation: we get from the university a tar file containing the files root@edf:/etc/Maple/bin.IBM_INTEL_LINUX_REDHAT# ls -1 hostpatch ld-linux.so.2 libc.so.6 libdl.so.2 libICE.so.6

## Turning points problem??...

Hi I got an equation that I would like to find out its turning points.As you know you first have to differentiate it and then..... Here is my command on maple: y:=x->6x^2-7x-3*exp(-1/5*x); df:=diff(y(x),x); solve(%,x); and then I get 5 LambertW(-1/100 (e)^(((-7)/60)))+7/12 5 LambertW(-1,-1/100 (e)^(((-7)/60)))+7/12 as answers, I don't know if they are correct, but I do know that there must be a simpler answer than this! I was therefore wondering if you guys know how I can approach this problem differently! Thanks Chris