I am trying to solve and plot a diff. eq. with two initial condtions and keep getting the same error.

F1 := diff(x(t), `$`(t, 2))+omega^2*sin(x(t)) = 0;

g := 9.8; L := 1; omega := g/L;

sol := dsolve({F1, D(x)*0 = 0, x(0) = (1/2)*pi}, x(t), numeric);
Error, (in dsolve/numeric/process_input) invalid specification of initial conditions, got 0 = 0

 any help or suggestions would be appreciated

I have some X-Y data, and I would like to calculate a definate integral of the data. In this case x_data and y_data are vectors.

I tried this method.

y:=x->ArrayInterpolation(x_data,y_data,x)

But when I try to calculate an integral like this, I get an error.

int(y, x0..x1)

Error, (in int) operator y cannot be evaluated at one variable.

What is this error trying to tell me? I have tested by function y for values x1 and x2. My data is smooth and includes x1 and x2. I have no reason to believe that the function cannot be evaluated for any value of x. 

Is there another (better) way to do what I want? This is a part of a large worksheet that reads data from an excel file, and I don't know how to reduce the worksheet for only this problem.

Thanks.

A procedure can be made available in many worksheets by copying its original commands to each such worksheet. Is there a better way to include and invoke such a procedure in multiple worksheets?

with(Physics):
L := diff(q2(t), t)
diff(L, q2(t))

it return 0, is it correct?

Warning, unable to evaluate the function to numeric values in the region; see the plotting command's help page to ensure the calling sequence is correct

For the life of me I can not get maple to plot this equation.  I have poured over various resources and it simply isn't working.  I have gone so far as to use SIMPLIFY and even  Re(circuitSix) and Im(circuitSix) yet still get only errors.  Any insight would be appreciated.

I want to make a nested loop and store the data(with complex numbers) in matrix in order to make 3D plot.

The function hypergeom([2/3,2/3,2/3],[-1/3,4/3],z) has radius of convergence 1 and real coefficients.

But Maple tells me evalf(hypergeom([2/3, 2/3, 2/3], [-1/3, 4/3], 99/100),50);

is -138.999 + 0.0012 I
 

It should be more like −138.9962313171333091754979138344422738025

(Maple 18, version 991181)

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G A Edgar

Hi everyone,

I would like to create an eBook with the pakage "eBookTools", but I have got several errors if in my mw document there is a table. The same error came out if I try to compile a book with the sample documents ("GettingStartedWithMaple.mw"). Anyone knows a solution?

Thank you for your time

Giorgio

a1 := Matrix(3, [1, 2, 3, 7, 8, 9, 13, 14, 15]);
a2 := Matrix(3, 2, [5, 6, 11, 12, 17, 18]);
a3 := Matrix(2, [19, 20, 25, 26]);
a2 := Matrix(3, 2, [5, 6, 11, 12, 17, 18]);



i want to combine above matrices in big matrix like

A := Matrix(2, 2, [a1, a2, a3, a4]);

best regards

I am using Maple-9 to simplify the expression and the expression is not having numerical coefficients. Example expression is given below.

a2:=(18*d^2*R^2*r-4*d1^3*r+5*R^6-z1*r^3*p-14*r1^3*r*rc+k1*d^2*R^2*r);

The question here is: I want to collect all "positive terms" and "negative terms" and assign to new variable.

Please suggest steps for the above problem

Thank you in advance.

hello

when i weite this expression

diff(1/(6*t+1)+x(12*t+1)/(6*t+1)^2, t)

then it give an ans

-6/(6*t+1)^2+12*(D(x))(12*t+1)/(6*t+1)^2-12*x(12*t+1)/(6*t+1)^3

i want to solve it completly,but it give another darivative D(x) which is inside of the the equation.

how can i solve this D(x)

thanks

Hi all,

I am trying to define iso surfaces mathematically. From teh output of a numerical simulation, I have a 3d field of a parameter called MF. So, MF = MF (x,y,z).

So, when I have MF = constant, I will hypothetically have the equation for a surface called x = f(y,z). As I said it's the output of a simulation so I don't have a defined function for MF. Now, I wanted to calculate the surface area on a constant value of MF. I know that the way to calculate a surface is: integral of(1=Fx^2 +Fy^2)^0.5. on the other hand I know that MF = 11, everywhere on the surface. I am trying to come up with an expression for surface area, based on special derivatives of MF. I started by assuming a potential field for MF, but I didn't get to a conclusion and got a little confused. I would greatly appreciate any comments or helps.

Thanks,

Haley

Bubble := proc (X::list)

local n, i, j, t;

n := nops(X);

if n = 0 then ERROR("empty list") end if;

for i to n-1 do

   for j to n-i do

      if X[j+1] < X[j] then

          t := X[j];

          X[j] := X[j+1];

          X[j+1] := t;

      end if;

   end do;

end do;

print(X);

end proc

I make bubble sort algorithm. but i can't find 'illegal use of a formal parameter'.

The following integral
f := u-> int(-1/(x*sqrt(-1+u^2*(x+1)^2*x^2)), x = (1/2)*(-u-sqrt(u^2-4*u))/u .. (1/2)*(-u+sqrt(u^2-4*u))/u);
arised in an applied research. I was asked about its properties:
plot on RealRange(4,infinity), limit(f(u),u=4,right), limit(f(u),u=infinity).
Unfortunately, I lost a file. As far as I remember it, I have had a problem with
the last-named one only:

limit(f(u), u = infinity);

MultiSeries:-limit(f(u), u = infinity);

asympt(f(u), u, 2);

Error, (in asympt) unable to compute series

Hope my colleagues will make progress with it. The assumed value is Pi/2.