## hypergeom & integration...

Would anyone be able to help me integrate ones like the following: Int(1/exp(eta)*eta*hypergeom([1, 1, 1],[2, 2, 2],eta),eta); I've tried using convert, simplify, etc. but nothing works. Many thanks, Sandra

## Using a proc to change a member in a list...

Suppose I want to use a proc to change an element in a list. I run into this problem > TestProc := proc (s) s[3] := 5 end proc; > s := [1, 2, 3, 4]; [1, 2, 3, 4] > TestProc(s); Error, (in TestProc) illegal use of a formal parameter I realize I could make s a global variable, but what if I want my proc to be able to operate on *any* list? In C++ one would use a pointer, but I don't see that kind of capability in MAPLE. Is there another way to do it? -Thanks

## Solving 2nd order ode with IC???...

Hi - I'm new to Maple. I can't seem to solve an ode with Maple because it gives me this error: Error, (in combine/exp) too many levels of recursion Lets say I have the following equation: > diffEq := (diff(y(x), x, x))-7*(diff(y(x), x)) = 7*exp^(3*t); I try the following and include the ICs: > with(DEtools) > dsolve({diffEq, y(0) = 1, y'(0) = 3}, y(x)); I wanted to know why this doesn't work? Correct syntax would be great. Thanks.

## Defining distribution...

Hi, I have a lognormal distribution of which I know the 5% ,50% and 95% value of X.Can I work out the equation of pdf and cdf for the particular distribution? Thanks in advance, Nasos

## Finding the best-fit compound sine function?...

I have a set of data points which form an *almost* straight line, but as the line is extended out the data points vary more and more from the median. I've figured out that they're actually forming a sinusoidal wave, which grows in "bandwidth" as it goes further out, and which is centered on a y=mx+b line. I'm guessing the fuction is along the lines of y= (ax)*(sin(bx))+cx+d How do I get that formula out?

## Help with printing inermediate steps of dsovle fun...

I was wondering if anyone might know how to print the intermediate steps when using the dsolve function in to solve a 4th order ODE. I get the result of the dsolve function, but I want to see the actual steps that maple takes to get there. Is this feasible at all, or is there another much simpler method that I'm just not finding? Thanks in advance Jimmy Navarski

## Complex numbers and images...

Hi, I have a matrix of complex numbers. How can I show the image with maple? Thank you

## Error in quaternion package...

Hi, I've been experimenting with the quaternionspackage. (The free download, not the commercial package). There seems to be an error in the calculation of the inverse: with (Quaternions); [*, +, -, Qabs, Qadd, Qamplitude, Qangle, Qarccos, Qarccosh, Qarccot, Qarccoth, Qarccsc, Qarccsch, Qarcsec, Qarcsech, Qarcsin, Qarcsinh, Qarctan, Qarctanh, Qargument, Qaxial, Qceil, Qcolatitude, Qconjugate, QconvertToFrac, Qcos, Qcosh, Qcot, Qcoth, Qcsc, Qcsch, Qdefine, QdivLeft, QdivRight, Qdot, Qeval, Qexp, Qfloor, Qfrac, Qicoeff, Qinverse, QisCommutable, QisEqual, QisPure, QisScalar, Qjcoeff, Qkcoeff, Qlength, Qln, Qlongitude, Qmagnitude,

## how to calculate inverse of this matrix!...

Dear sir: I have a question, I am not sure if the Maple can solve it. For a n*n matrix such as: ------------------------------- X_1 x_2 x_3 ... x_n 1 0 0 ... 0 0 1 0 ... 0 ... 0 0 0 ... 1 -------------------------------- Where n is a constant (n is a abstract number, not concrete as 3 or 4), the same is for x_1,x_2... I want to calculate its inverse of this matrix! I am not sure whom I should ask for help! Please give me some instructions! Yours sincerely;

## Scope of local variables...

OuterProc := proc () local i, j; InnerProc := proc () i := 15 end proc; i := 0; InnerProc(); i end proc; The following proceedure returns 15, just as I want it to. However, compliation generates a warning saying that the variable i is implicitly local in Innerproc, which it is not. Is there any way to turn off this warning without turning off legitimate warnings about implicit declarations of local variables?

## finding the inverse of a matrix using Gauss Jordan...

I am trying to write a procedure that will find the inverse of a matrix, A, using the Gauss Jordan method, without using the commands GaussJord or Inverse. Anyone any ideas?

## Student Versus student Package...

Is (Student) still a package in Maple ? I was trying to get a double integral to work and I was only able to do so after replacing, (with(Student)), with the command (with(student)), and using the command Doubleint. Why was that so ? v/r, Also is the student package the only place where one can get tools to do iterated integrals ?

## Objects in MAPLE programming Language...

I’ve learned a fair amount about programming in MAPLE but am still perplexed by some things. I’m not sure how to simulate VB user defined types. Do I use modules, records, tables, some combination of the above? I wrote a Sudoku solving program in VB. The program used the following type and variable declarations: Private Type Square_ NumPossible As Integer Possible(9) As Boolean Number As Integer End Type Dim Square(9, 9) As Square_ If Square (i,j) had been solved then Square(i,j).Number was not equal to 0. If the number 7 were still a possibility in Square (i,j) then Square(i,j).NumPossible(7) returned TRUE.