Hello

Is there a way to change globally all time horizontal axis limits in one go ? I have to define each time each of my 12 probe signals, parameter by parameter, axis by axis, even if I'm using the same values.

Im missing in the right "parameter plot" window a way to define globally the time interval for all plots, and not necesarily the time interval of the full simulations, in particular to leave the system stabilise and get rid of the initial peaks and oscillations.

I regularly choose a function for my numerical analysis class that looks bad (i.e., has jumps) when graphed on a small domain.  For example,

plot(ln(1+x), x = -10^(-15) .. 10^(-15))

If I increase Digits or use a Taylor series to replace ln(1+x), the graph looks fine.

I tried this with cos(x) - x as follows:

plot(cos(x)-x, x = -10^(-16) .. 10^(-16))

Hello,

I have an equation which is   Y=A*x^3 +B*x.     Y=-60..60  and  x=-1..1

How can I find the A and B parameters using Maple?

thanks

Bengu

So MapleSoft has sold out to a Japanese engineering company. I have lost all hope that the company will ever care about mathematicians again.

It used to. But for years it has all been about engineering. The new features that mathematicians care about get fewer every year. All R&D seems to be on the MapleSim, Matlab integration etc or interface.

<p>I have the following code:</p>
<p> </p>
<p> for D5d_counter from 1 to 1000 do<br />
increment := 0.1:<br />
D5d_incr := initial_D5d + increment:<br />
D5d_decr := initial_D5d - increment:<br />
energy_D5d_init := energy1d(initial_D5d);<br />
energy_D5d_incr:= energy1d(D5d_incr);<br />
energy_D5d_decr := energy1d(D5d_decr);<br />
#evalM(cat("plot(",convert(P[1],string), ",",convert(P[2],string), ", '+')"))</p>

I have always wanted to know why the lognormal distribution in the Black & Scholes (BS) option pricing model

is assumed to have a mean of  T*(r-0.5*sigma^2 ) . I have seen various explanation but non that make any sense.

I know that the mean in a lognormal distribution is exp(u+0.5*sigma^2) but why does it suddenly become

T*(r-0.5*sigma^2 ) in the BS model ?   I can understand the T = mean proportional to the time increament but why does

How can I extract the order of a number in a list?

e.g.

L:=[1,3,5,8,9];

Order(3)=2

Order(9)=5

Hi,

Reading about the "Table of Chords" of Ptolemy, I stumbled on something I thought should be easy in Maple.

For example, in the table, I have that the chord length  for 1/2 degrees (with radius 60 of course) = 0;31,25 wiich mean 0+31/60+25/(60)^2=377/720=0.52361.

What I would like to do in Maple is evalf[6](sin(1/2 degree))=0.008728 and then convert the decimal part of the answer into a list so I can do

How do I define a large multivariate polynomial

For all i, j, k, l, m, n from 1 to 2

         sum t = 0 to 7: x_{i,j, t} * y_{k,l, t} * z_{m,n, t}

in maple?

 

Hello,

I'm new to maple's datastructures. Is it possible to store some rather complicated data in the nodes (or leafs) of a n-nary Tree? Are there also B-Trees?

How do I complete the following by using row reduction rules.

3x            -z=-1

4x     -y    -2z =-5

2x +  7y  + 9z = 0

Hi everybody?

I have a small bug when create a maplet for a simple logical example.

> myMaplet := Maplet(Window(title="Logic Test",
[
["A : ", TextField['A'](5),
 "B : ", TextField['B'](5)],
["A = B?", TextField['TF'](10)],
[Button['EX']("Do", onclick=ACT),
 Button['QT']("Quit", enabled=true, Shutdown())]
 ]),
Action[ACT](Evaluate('TF'=evalb(eval(A=B))))
):
>Maplets[Display](myMaplet);
 

Hey,

I am uing cmaple.ext to generate batch of images.

However, i found some of the functions are not the same as i execute from the worksheet from standard maple interface.

 

There are lot of white space around the image...

Is there any way to reduce them?

This is a problem about which I have previously posted here on several occasions, please stop reading now if you are fed up with it, I do apologize.

Let me go straight to the somewhat-reduced-form problem. I have two (non-autonomous) ODEs in C(x) and Q(x)

ODE1 := diff(C(x),x) = s*(fx(x)-Q(x))*C(x) / (f(x)-C(x));
ODE2 := diff(Q(x),x) = (Q(x)-b1)*(b2-Q(x)) / (f(x)-C(x)) + (Q(x)-b)*s*(fx(x)-Q(x))*C(x) / (f(x)-C(x))^2;

In the above, f(x) is a known function and s, b1, b2, b are known real parameters. A particular parameterization is the following:

Hi everybody:

I have an application that requires the following:

a) perform integration of a 2D function over a triangle;

b) perform integration of a 2D or 3D function using different orders in each direction.

Other than writing your own procedures is there a way to do that with Maple? And if you have to go down that path, could you somehow utilize the weights and stations of integration which are hardwired (I assume) in Maple? And in so doing save your self the effort of typing long streams of numbers.

 

thanks a lot