I have a sample waveform of an air conditioner and want to see if any low frequencies (10 Hz which is harmful to human health) exist in the wave.  How can I do that?

Granted the frequencies picked up in the recorded file depend on the quality of the recording and the recorder and lower frequencies may not have been picked up. 

I've looked at

Hi im somehow not able to export my worksheet into a word document, as the rtf format doesnt seem to be available on the maple 15 mac version. converting into html is possible but not satisfying. i really need help here.

thanks a lot !!!!

greetings

What is the distance between the trigonometrical polynomials of the form a0/2+a1*cos(Pi*x)+b1*sin(Pi*x) and the polynomials of  degree at most 1, ie c0+c1*x, in the Chebyshev metrics on the interval [-1,1] and in the L^2 metrics on the same interval?

i want '*' to keep doing exactly what it already does. for example, x*x*x*x is still x^4.

but furthermore, i want to be able to somehow redefine(define in addition) '*' as follows:

protect('a');protect('b');

redefine('*', a*b=1,b*a=-1);

basically, for protected letters a and b, maple...

How can I plot f(x,y)=(cos(x^2+y^2))^1/2 whithout knowing the domain?

And then having Maple to find the domain and plot it?

Thanks.

I have a package, a zip file, written by someone, it consists three files, as seen below

what this package, let's call it helloworld, offers is the following:

all i need to do is extract those three files shown (hdb, ind, lib) into C:\Program Files (x86)\Maple 12\lib

then once i type with(helloworld):

1, it modifies the...

I wish to view the complete internal workings of the code (specifically the SHA code created by Joe Riel)

I tried  ...

interface(verboseproc=2)
print(SHA)  #appears to show a limited amount of code

showstat(SHA)  #shows some code but it's not complete

march('list',"c:\\testlib\\SHA.mla")   # not exactly what I thought it would list

How do I view the code? 

hi

i want to solve following equation

f(s)=a+b*s+c*s^2

with these condition

f(0)=0

f'(0)=0

f'(5)=1

please help me

thancks

hi,

please Help me in the following code :

> restart;
i:=0;
             
u[i](s):=A+B*s-C*exp(-s);
              
lambda(s,x):= -(1/2)*(s-x)^2;
                    

tre(s,x):=lambda(s,x)*(diff(u[i...

I have a set of nonlinear and coupled PDEs for a cable actuated system. I want to transfer this set to a set of ODEs and write it down in Matrix form. I used Galerkin's method and derived the ODEs in discritized form. I have a problem in converting this set of equation into a matrix form like "Mq"+Cq'+Kq=F". The derived equations are very complicated and contains some nonlinear terms. One of the three equations looks like this:

i want to create my own package Helloworld (includes proc1 and proc2) so that people can do

with(Helloworld);

and get

[proc1,proc2]

and then they can then use proc1 and proc2 as they wish.

thanks in advance

Hi

When the numerator of a quotient is a negative integer, Maple puts the quotient into parentheses and the negative sign before the quotient (not with the numerator). Here is an example:

with(RandomTools);
a1 := Generate(integer(range = -10 .. -1));
Limit(a1/(x-3), x = 3, right);

I would like to have the negative sign with the numerator and to remove the parentheses.

I tried to export the limit in MathML, but it didn't work.

In...

hi,

i want to solve this equation :

f(n+1)(x)=f(n)(x)-int [ (s-x)^2 * ( F"(n)(s)+.5*F(n)(s) ) ds]

 integration is from  -infinity  to  x

with this initial guess   f(0)(x)=A+Bx+C*exp[-x]

i want for example F(4)(x) in terms of A,B,C

 and then calculate A,B and C with this condition

f(0)(4)=0

f'(0)(4)=0

f'(10)(4)=1

please help me

thancks

Dear guys

I have an expression and I solve it by "solve". It has two results and I want to choose first of them. How can I choose for example the first result? Is the order of results the same if I run the program many times?

For the following system:

x1 := M*(cos(phi)-a*cos(3*phi)) / (1-b*cos(2*phi))

x2 := M*(cos(phi)+a*cos(3*phi)) / (1+b*cos(2*phi))

y1 := M*(sin(phi)-a*sin(3*phi)) / (1-b*cos(2*phi))

y2 := M*(sin(phi)+a*sin(3*phi))/ (1+b*cos(2*phi))

I'd like to find M(x1,x2,y1,y2) if possible; that is, I'd like to solve for M in terms of x1, x2, y1, and y2, eliminating a, b, and phi.

I've tried

solve({x1=X1, x2=X2, y1=Y1, y2=Y2},{M,a,b,phi},AllSolutions);