Hello,

I'm trying to fit a double-diode equation using Maple.  I can get an analytic form of the fitting function in my two variables V and J of the form V(J), but I want J(V), so I'm using fsolve to extract this.  I'm then trying to fit the resulting function to a set of experimental data, but I'm getting an error about writing to an rtable.  I've tested the function, and it gives me a numeric value if I give it numeric inputs.  Is there a way I can fit it?  Code is below:

Dear everyone,

  Hello,  I have a question about obtaining the power of a variable. Suppose

f:=x^5;

g:=degree(f,x);

I got 5.

now let f:=x^n;

g:=degree(f,x)

I got FAIL :(  I tried g:=log[x](f), it doesn't go to "n" either.

Is there anyway I can simply get the "n" in x^n? I know "n" is an integer, but how to refine into integer type?

Thank you very much in advance

Does anyone know how to include Greek characters in a Maple plot?  I am not talking about axis labels or plot titles.  I would like to be able to include any characters I want, including Greek, anywhere I want.  I have Maple 15.

Greg Spradlin

Embry-Riddle Aeronautical University

Hi there.

Is it possible to get Maple to factorise polynomiums like for instance the one given in the Maple sheet I've attached? The idea is to get both the nominator and denominator factorised, making it easy to read poles and zeros for an electrical circuit.

Thank you.

I would like to show a single plot comparing the 2nd, 3rd, and 4th degree Taylor polynomials of y=sqrt(2x+1) centered at x=4, with each polynomial having a different color. By default, Maple produces the plot with the function in red and all polynomials in blue. I can easily do this using the plot command, but I'd like to know if there is an option in the TaylorApproximation command that would achieve the same end result.

Thanks!

Hi all,

I am trying to add the two expressions in MAPLE 15, but it returns exactly the same expression back, is there any way I can add these two expressions?

Please find the attached file

mapleprimes.mw

Thanks in advance

A.Q

Soton

I am trying to solve a tricky system of diff eq....can somebody point me in the right direction, the error message is involved with the initial conditions..

I have 2 column vectors I am trying to plot against each other. The vertical axis needs to be logarithmic.

If I say

plot(mass,map(log,pressure),style=point);

it works and I get all 19 points.

If I say

logplot(mass,pressure);

I get the correct scales in both directions (so nothing would be cut-off) but it plots only 4 points.The same happens if I use plot(...,axis[2]=[mode=log]);

The pressure values range from 1E-7 to 1E-12....

Hello, 

I am trying to solve a simple equation 

x(0.0178){tan([2.10^-5](x)^0.5)}^2=+2.32.10^12-x, which I want to be solved over the range 1.10^10......2.10^12.

I have tried the following program (which I have got help on):

restart; 

eq := x(0.0178)*tan²(Sqrt(x)*2E-5) = 2.32e12-x;

Hi all,

I have a function which Maple is happy to integrate from -100 μm to +100 μm,  but won't do between -60 μm and 100 μm.  Screenshot here:

 http://oi39.tinypic.com/34jdif9.jpg

The graph of the function reveals no obvious reason why it shouldn't be able to integrate from +infinity to -infinity (which I'd like to be able to do) and everything in between:

How to solve the  partial derivative at a specified point

The latex code is

f(x,y)=x+(y-1)\arcsin\sqrt{\frac{\,x}{y}}

f''_{xx}(x,1)

Hi,

Is it possible in maple to estimate a density using my own kernel function (Gamma; Beta, Exponential...) instead of the  default kernels ( 'gaussian', biweight, epanechnikov, triangular, rectangular)?

Hallo,
I have to estimate a logistic growth function, with the functional form
f(t)=A/(B+exp(-k*t))
The dataset is given by

X:=[1950,1960,1970,1980,1990,2000,2010];

which describes the values of t
and by

Y:=[2.53,2.76,3.12,3.75,4.2,4.3,4.35];

which describes the values of f(t).
I now have to estimate the values of A,B and k.
I tried NonlinearFit by

with(Statistics):
NonlinearFit(A/(B+exp(-k*t)),X,Y,t);

I have something like E1:=y=x*b+z*a+c*i. and i want to solve for y/i. I try doing solve(E1,y/i) but it says i cant solve for an expression. is there a way to get around that?

I have a set of test equations. I am substituting the coefficients of the variables A₁ ..A₄ and the constants in the equations. Most of this I have made work fine. There are 2 coefficients I cand make be substituted. In eq₁ k*d the coefficient of A₃ and eq₅ 3.1d² also the coeff of A₃ .Have tried subs and algsubs but can't make it work. The reason I want to do this is in reality I have 15 equations...