## need help to obtian the theta(eta) and diff(theta(...

Hi i have difficulty to obtain the function of theta(eta) and diff(theta,eta) form the matrix. Every time i have to take the values from the matrix inorder to make the function of theta(eta) and diff(theta(eta),eta) which is very difficult.

Can you please make a code in MAPLE so that i may get the direct fuction of theta(eta) and diff(theta(eta),eta)from the matrix gernerated by MAPLE.

i WILL WAIT FOR YOUR QUICK RESPONSE.

## how can i eval a function wiith a matrix?...

i would like to nknow how can i eval a function wiith a matrix?

`> restart; with(ArrayTools); with(LinearAlgebra); with(MTM);`
` varhi := 10; `
`varlo := 0; `
`npar := 2; `
`popsize := 9; `
`par := (varhi-varlo)*RandomArray((proc (A) local i; `
`if A::(rtable[column]) then `
`seq(A(i), i = 1 .. NumElems(A)) else`
` args; `
`end if `

## significant figures...

is there a maple function or does anyone have a proc that will return the number of significant figures given a number? For example, when given 0.38, the proc will return 2, or when given 2.897, the proc will return 4.

## Issues w/ the Solve Function...

I just purchased Maple16 and am working on a problem where I need to solve for variables which are imbedded in non-trivial equations. When I first began using Maple16 to solve for these symolic variables, the solve function worked; however, after about 45 min of using the solve command, on non-trivial equations, it would output nothing and the cursor would move down to the next line. A simple equation such as: f(x)^2-g(x)f(x)=s(x) it will still solve. Has anyone ever experienced...

## Why Maple can not solve this integral?!...

`Hi friends`
`This is strange for me, but Maple could not solve the below integral. I tried with online version`
`of Mathematica and it solved for me. The solution is Hypergeometry function. `
`> f := ((1/2)*r+1/r)^(1/n);> int(f, r);`
`What is the problem?`
` `
`Regards!`

## Function in Maple...

I used to work with Matlab and recently I've started to use Maple. In Matlab you can make a function with several commands that does some calculations and calculates one parameter and you can call that function in another function. I need to the same in Maple (i.e. define a function with several commands that calculates a parameter and use the result of that function in another function). Any suggestion?

## Four function, two interval, in one plot...

Hi! I have 4 function. I wanna plot two of them in x=-0.5..0 range; the other two in x=0..0.5 range. How can I display that four function in one plot? Thanks!

## Integral function with variable upper limit...

E := proc (phi) options operator, arrow; int(1/(1-(1-1/kappa^2)*sin(phi)^2)^(1/2), phi = 0 .. phi) end proc

E(pi/2)

Is there a way to get this function to work properly without having to simplify the integral manually ?

kappa is a constant (with a value of 12.4)

## differentiate something by unknown variable...

Hi,

I'm trying to creat u which is a function of ξ. but I do not have the full definition of u yet. how can i write it in a way where when i differentiate it, it'll give me something like u(ξ),ξ? And that i can differentiate it once more with ξ and it gives me u(ξ),ξξ and so on?

## Help with finding "onto" functions...

Given:

`f:=proc(a) x->modp(a*x,256); end proc:`

Determine for which values of a in Z[256] the functions f(a) are onto.

I know that I need to use evalb to check if the image and coDomain are the same. I just cannot get it to work.

## substituting one function into another...

Given Maple expressions f(g,x) and g(x) how would you replace g in f  to show a function in x.

## vector of functions...

Hi. I have a question that concerns indices of vector of functions within for-loop.

I have a following piece of code:

## Plotting 3D Functions...

Hi,
I'm trying to visualize a 3-Dimensional function, the color being the 4th dimension. All the examples that I have found of the so called plot3d function only involve 2D functions, the third dimension really being the return value of the function. I need more: I have a 3D function which takes in (x,y,z) if you like, and outputs one number. I'd like to visualize this function in maple.

Thanks,
~Austen

## still have problems...

still have problems,
1.
restart:
f := proc (x) options operator, arrow; piecewise(0 <= x and x < 4, 50, 4 <= x and x < 5, 0, 5 <= x, f(x-5)) end proc;

plot(proc (t) options operator, arrow; evalf(Int(f, 0 .. t, epsilon = 0.1e-3, digits = 15)) end proc, 0 .. 20);

in the above figure,there is a discont point in the interval [16..18],but in fact,it's a continuous curve.

2.
how to use fsolve deal with two periodic functions?

## How does this function...

How does this  function  work:

rtable_scanblock( M, [rtable_dims(M)],

(val,ind,res) -> `if`(val > res[2],[ind,val],res),

[[1,1],-infinity]);

Please could comment on each statement.

Gracias

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