2 years, 41 days

## residual standard error command?...

Maple 2018

Does there exist a Maple command that on its own calculates the residual standard error of two regression lists?

## Why does Maple 2018.1 want me to upgrade...

Maple 2018

I have Maple through the school where I teach math, and the IT-guy gave us Maple 2018.1 to install.

But after a while even though I have Maple 2018.1 installed on my computer Windows 10 pc, then Maple 2018.1 surgests that I upgrade to 2018.1?? Any idea why?

## Possible to disable the editable feature...

Maple 2018

Hi guys and girls,

The new Maple 2018 have a feature in the buttom called editable. If you remove that mark in the buttom of the screen, then maple doc can't be edited. I teach students who have english as a second language and some remove the mark in the editable box by mistake. Such that they can't do there hand-ins etc.

So is there anyway to disable the editable box in the buttom of the screen?

Fred

## Maple function issue? ...

Maple

Dear Sirs,

I am trying to construct for my students the situation in Maple how to calculate the maximum area of a right triangular garden, if the perimeter is 60 meters long, and the two known sides are x, y and the third side is z and is part of the garden which isn't covert by the perimenter fence.

perimenter P = 60 -> x+y = 60

Next using the Pythagoran theorem and solve.

solve(x^2+z^2=y^2) and maple gives the solution z = sqrt(-x^2+y^2)

The area of the right triangle is T = 1/2*x*z

where y can be found solve(x+y=60,y) - > y = 60-x

I insert this into the formula for my area formula.

T(x) = 1/2*x*(sqrt(-x^2+(60-x)^2)

I solve(T'(x)=0) and get x = 20.

However if I wanna show the that they can insert x = 20 into T(x), then the following happens.
T(20) = 1/2*20*(sqrt(-x^2+(60-x)^2)

meaning Maple only inserts 20 the first x and not the second or third x. Any idea why this happens?  Does Maple think that the second and third x are functions?

Best Regards

Fred

## Finding the value intersection between t...

Maple

Hi I am trying to get Maple to find for which value k two parametric lines intersect using geom3d package. Is that possible?

my code is as follows.

restart; with(geom3d);

#First I define the the point and vector to construct the line l.

point(P, 1, 0, -2);

v := [1, 1, 2];

line(l, {P, v});

Equation(l) = [1 + t, t, -2 + 2 t]

#Next I try to define the line m.
line(m, [k*s+4, 2*s, 3*s], s)

but how (if possible to I get the line to take in the second paramter k?

and if its possible? which syntax do I use in the intersection-command to get Maple to print out the value k? so it still uses the parameter s for the intersection?

best regards

Fred

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