## what are the best values of \$m\$ and \$n\$...

help me here:

suppose we have:

h(x):=(x^n)/(sqrt(1+x^m))-log(1+x):

how can we find the best values of m and n such that h(x) > 0

one can show that for m = n = 1

h(x) > 0.

one may solve this by first finding the derivative of h(x)

diff(h(x),x)

and then solving

solve(diff(h(x),x),[m,n] )> 0

we may assume x > 0

## Spline in 3D?...

I see that there is a command for a 2D spline:

Spline(xydata, v, dgr, endpts)
Spline(xdata, ydata, v, dgr, endpts)

But my data is (x,y,z).  Surely there is some way to fit a spline curve to this?  I'm not asking for a surface -- it's just a list of points.

## Incomplete worksheet...

Hello,

I have a class where we do alot of physics problems with Maple.  I spent over 3 days working on these homework problems. When I saved my worksheet and then opened it later, I found that I was getting the error incomplete worksheet. Now I am unable to retreive any of my work and I am in some serious trouble!  Could someone help me recorver my work? Thanks!

## Procedure - assuming positive values for the outpu...

Dear experts, I am using a procedure called Powell(f, Xmin0) with the input parameters f (it is a function) and Xmin0. It is a kind of optimization tool. The poutput is X. It contains the 2 optimized values. The problem is that it is also optimizing with negative values. But I want that it stops when X becomes smaller than 0 so hegatibe. How can I implement that in the algorithmus in an easy way? Thanks a lot!

## Isolating variable quotient...

Hi, is it possible for maple to isolate a variable quotient (with one command)?

i.e. for the expression

eq:= 0 = g-b*v_t/m

-> b/m = g/v_t

I tried this:

isolate(eq, b/m);

and got

"Error, (in isolate) 0 = g-b*vt/m does not contain b/m"

if however I isolate for b and then divide by m i get whats required:

isolate(0 = g-b*v_t/m, b)/m;
b/m = g/v_t

is there a more direct way?

## Problem in Maple11 installation...

Dear Sir/Madam I heared that the classic part of maple 11 is more faster than Maple 12 so I decide to install maple 11 but: I cannot install maple 11 in my Notebook. When I Doubleclick on installation it start to extract. but when it reached 100% disappears! I also tested the second theory. in temp folder I double clicked the extracted setup application in windows directory. but no response too! What I need before installation? In addition, after that I installed Maple 12 seccessfully! without any problem! And Also I can Install maple 11 in my office's PC.

## vector norms...

write a program that finds three norms for a given vector?

## How do I change the background colour of a workshe...

Can't seem to figure out how to change the background colour of a worksheet.

It's not a simple right click on the background as one would think as that option is not available.  And it's not in the tools option menu.  Can it be done?

## what is pattern in this series...

-1 / 6 + 1 / 20 - 5 / 84 + 7 / 216 - 47 / 1320 + 37 / 1560 - 319 / 12600 + 533/ 28560 - 1879 / 95760 + 1627 / 105840 --...

thanks

## Example in Help doesn't work...

I wanted to try this example of Maple's help, but it gives an error message:

restart;

with(algcurves);

f := y^2-x*(x^2-1);

plot_real_curve(f, x, y, showArrows = true);

Error, (in algcurves/CurvePlot:-PlotRealCurve) too many levels of recursion

## Fortran with Maple...

Hello

I'm interested in passing programs from Fortran to Maple, I have some queations:

1) Is it true that maple can only understand functions, and doesn't understand subroutines?

2) If Fortran function uses commands like "exp" "max" etc, is it okay?

3) If Fortran function uses external libraries (.lib, .dll) do I need to combine then somehow with the dll file I'm preparing for Maple? How?

## Parametric Surface - Axes Question...

When I plot a parametric surface:

S5 := PositionVector([VectorCalculus[`*`](u, v), VectorCalculus[`+`](u, v), VectorCalculus[`+`](u, VectorCalculus[`-`](v))], cartesian[x, y, z])

VectorCalculus[PlotPositionVector](S5, u = VectorCalculus[`-`](1) .. 1, v = VectorCalculus[`-`](sqrt(VectorCalculus[`+`](1, VectorCalculus[`-`](u^2)))) .. sqrt(VectorCalculus[`+`](1, VectorCalculus[`-`](u^2))))

## how to simplify diff:...

can we simplify the answer of the following command:

diff(arctan(sqrt(b*a)/b)/sqrt(b*a), `\$`(b, n))

thanks

## How do I decompose fraction into partial fraction?...

I used convert(problem,parfrac,x) and it gave me an error saying augment not a rational function.

(3x - 1) / x(x-1)

want to diplay it like this

A/X + b/(x-1) then coming up with the answer like this 1/x + 2/(x-1).

Newb to maple and this is my first post. Thanks